10 |
11 | extern NSString * const kViewIdfSingle1;
12 | extern NSString * const kViewIdfSingle2;
13 | extern NSString * const kViewIdfSingle3;
14 | extern NSString * const kViewIdfSingle4;
15 | extern NSString * const kViewIdfSingle5;
16 |
17 | @interface SingleView : UIView
18 |
19 | @property (nonatomic, copy) NSString *data;
20 |
21 | @end
22 |
--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView.xcodeproj/xcuserdata/xiabob.xcuserdatad/xcschemes/xcschememanagement.plist:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | SchemeUserState
6 |
7 | LazyScrollView.xcscheme
8 |
9 | orderHint
10 | 0
11 |
12 |
13 | SuppressBuildableAutocreation
14 |
15 | 743FAFA31E0BBA54008097E9
16 |
17 | primary
18 |
19 |
20 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
1 | {
2 | "images" : [
3 | {
4 | "idiom" : "iphone",
5 | "size" : "29x29",
6 | "scale" : "2x"
7 | },
8 | {
9 | "idiom" : "iphone",
10 | "size" : "29x29",
11 | "scale" : "3x"
12 | },
13 | {
14 | "idiom" : "iphone",
15 | "size" : "40x40",
16 | "scale" : "2x"
17 | },
18 | {
19 | "idiom" : "iphone",
20 | "size" : "40x40",
21 | "scale" : "3x"
22 | },
23 | {
24 | "idiom" : "iphone",
25 | "size" : "60x60",
26 | "scale" : "2x"
27 | },
28 | {
29 | "idiom" : "iphone",
30 | "size" : "60x60",
31 | "scale" : "3x"
32 | }
33 | ],
34 | "info" : {
35 | "version" : 1,
36 | "author" : "xcode"
37 | }
38 | }
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
1 | MIT License
2 |
3 | Copyright (c) 2016
4 |
5 | Permission is hereby granted, free of charge, to any person obtaining a copy
6 | of this software and associated documentation files (the "Software"), to deal
7 | in the Software without restriction, including without limitation the rights
8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 |
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 |
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 |
--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView/Info.plist:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | CFBundleDevelopmentRegion
6 | en
7 | CFBundleExecutable
8 | $(EXECUTABLE_NAME)
9 | CFBundleIdentifier
10 | $(PRODUCT_BUNDLE_IDENTIFIER)
11 | CFBundleInfoDictionaryVersion
12 | 6.0
13 | CFBundleName
14 | $(PRODUCT_NAME)
15 | CFBundlePackageType
16 | APPL
17 | CFBundleShortVersionString
18 | 1.0
19 | CFBundleVersion
20 | 1
21 | LSRequiresIPhoneOS
22 |
23 | UILaunchStoryboardName
24 | LaunchScreen
25 | UIMainStoryboardFile
26 | Main
27 | UIRequiredDeviceCapabilities
28 |
29 | armv7
30 |
31 | UISupportedInterfaceOrientations
32 |
33 | UIInterfaceOrientationPortrait
34 | UIInterfaceOrientationLandscapeLeft
35 | UIInterfaceOrientationLandscapeRight
36 |
37 |
38 |
39 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # LazyScrollView
2 | iOS 高性能异构滚动视图构建方案 —— LazyScrollView
3 |
4 | ##思路来源
5 | * [苹果核 - iOS 高性能异构滚动视图构建方案 —— LazyScrollView](http://pingguohe.net/2016/01/31/lazyscroll.html)
6 |
7 | 已开源https://github.com/alibaba/LazyScrollView
8 | ##使用
9 |
10 | 使用方式和tableView类似，具体还是参照工程里面的例子。
11 | ###dataSource
12 |
13 | // ScrollView一共需要展示多少个item
14 | - (NSUInteger)numberOfItemInScrollView:(LazyScrollView *)scrollView;
15 | // 要求根据index直接返回RectModel
16 | - (LSVRectModel *)scrollView:(LazyScrollView *)scrollView rectModelAtIndex:(NSUInteger)index;
17 | // 返回下标所对应的view
18 | - (UIView *)scrollView:(LazyScrollView *)scrollView itemByLsvId:(NSString *)lsvId;
19 |
20 | 其中LSVRectModel的定义如下：
21 |
22 | // view转换后的绝对值rect
23 | @property (nonatomic, assign) CGRect absRect;
24 |
25 | // 业务下标，如果初始化时没有提供，LSVRectModel内部会自动生成
26 | @property (nonatomic, copy) NSString *lsvId;
27 |
28 | 关键在于方法- (LSVRectModel *)scrollView:(LazyScrollView *)scrollView rectModelAtIndex:(NSUInteger)index，具体可以参见demo工程。
29 |
30 | ###delegate
31 |
32 | //处理点击事件
33 | - (void)scrollView:(LazyScrollView *)scrollView didClickItemAtIndex:(NSUInteger)index;
34 |
35 |
36 | ###调用核心API
37 |
38 | - (void)reloadData;
39 |
40 |
41 | 重新走一遍DataSource的这些方法，等同于TableView中的reloadData
42 |
43 | - (UIView *)dequeueReusableItemWithIdentifier:(NSString *)identifier
44 |
45 |
46 | 根据identifier获取可以复用的View。和TableView的dequeueReusableCellWithIdentifier:(NSString *)identifier方法意义相同。通常是在LazyScrollViewDatasource第三个方法，返回View的时候使用。
47 |
48 |
49 | - (void)registerClass:(Class)viewClass forViewReuseIdentifier:(NSString *)identifier
50 |
51 |
52 | 功能和TableView的registerClass:(nullable Class)cellClass forCellReuseIdentifier:(NSString *)identifier一样
53 | tableView
54 |
55 |
--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView/SingleView.m:
--------------------------------------------------------------------------------
1 | //
2 | // SingleView.m
3 | // LazyScrollView
4 | //
5 | // Created by xiabob on 16/12/22.
6 | // Copyright © 2016年 xiabob. All rights reserved.
7 | //
8 |
9 | #import "SingleView.h"
10 |
11 | NSString * const kViewIdfSingle1 = @"kViewIdfSingle1";
12 | NSString * const kViewIdfSingle2 = @"kViewIdfSingle2";
13 | NSString * const kViewIdfSingle3 = @"kViewIdfSingle3";
14 | NSString * const kViewIdfSingle4 = @"kViewIdfSingle4";
15 | NSString * const kViewIdfSingle5 = @"kViewIdfSingle5";
16 |
17 | @interface SingleView ()
18 | @property (nonatomic, strong) UILabel *title;
19 | @end
20 |
21 | @implementation SingleView
22 |
23 | - (instancetype)initWithFrame:(CGRect)frame {
24 | if (self = [super initWithFrame:frame]) {
25 | [self setupUI];
26 | }
27 | return self;
28 | }
29 |
30 | - (void)setupUI {
31 |
32 | self.backgroundColor = [self randomColor];
33 |
34 | [self addSubview:self.title];
35 |
36 | self.title.frame = CGRectMake(0, 0, 100, 50);
37 | }
38 |
39 | - (UIColor *)randomColor {
40 | CGFloat hue = ( arc4random() % 361 / 360.0 );
41 | CGFloat saturation = ( arc4random() % 101 / 100.0 );
42 | CGFloat brightness = ( arc4random() % 101 / 100.0 );
43 | //hsb
44 | return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
45 | }
46 |
47 | #pragma mark - setter
48 |
49 | - (void)setData:(NSString *)data {
50 | _data = data;
51 | self.title.text = data;
52 | }
53 |
54 | #pragma mark - getter
55 |
56 | - (UILabel *)title {
57 | if (!_title) {
58 | _title = [UILabel new];
59 | _title.font = [UIFont systemFontOfSize:13.f];
60 | _title.textColor = [UIColor whiteColor];
61 | }
62 | return _title;
63 | }
64 |
65 | @end
66 |
67 |
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/LazyScrollView/LazyScrollView/Base.lproj/Main.storyboard:
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/LazyScrollView/LazyScrollView/Base.lproj/LaunchScreen.storyboard:
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/Classes/LazyScrollView.h:
--------------------------------------------------------------------------------
1 | //
2 | // LazyScrollView.h
3 | // LazyScrollView
4 | //
5 | // Created by xiabob on 16/12/22.
6 | // Copyright © 2016年 xiabob. All rights reserved.
7 | //
8 |
9 | #import
10 | @class LSVRectModel;
11 | @class LazyScrollView;
12 |
13 | typedef NS_ENUM(NSUInteger, LazyScrollViewDirection) {
14 | LazyScrollViewDirectionHorizontal,
15 | LazyScrollViewDirectionVertical,
16 | };
17 |
18 |
19 | #pragma mark - LazyScrollViewDataSource
20 |
21 | @protocol LazyScrollViewDataSource
22 |
23 | @required
24 | // ScrollView一共展示多少个item
25 | - (NSUInteger)numberOfItemInScrollView:(LazyScrollView *)scrollView;
26 | // 要求根据index直接返回RectModel
27 | - (LSVRectModel *)scrollView:(LazyScrollView *)scrollView rectModelAtIndex:(NSUInteger)index;
28 | // 返回下标所对应的view
29 | - (UIView *)scrollView:(LazyScrollView *)scrollView itemByLsvId:(NSString *)lsvId;
30 |
31 | @end
32 |
33 | #pragma mark - LazyScrollViewDelegate
34 |
35 | @protocol LazyScrollViewDelegate
36 |
37 | @optional
38 | - (void)scrollView:(LazyScrollView *)scrollView didClickItemAtIndex:(NSUInteger)index;
39 |
40 | @end
41 |
42 |
43 | #pragma mark - LazyScrollView
44 |
45 | @interface LazyScrollView : UIScrollView
46 |
47 | @property (nonatomic, weak) id dataSource;
48 | @property (nonatomic, weak) id delegate;
49 |
50 | /**
51 | * 滚动方向
52 | * 暂时只支持 `LazyScrollViewDirectionVertical`
53 | */
54 | //@property (nonatomic, assign) LazyScrollViewDirection direction;
55 |
56 | - (void)reloadData;
57 | - (UIView *)dequeueReusableItemWithIdentifier:(NSString *)identifier;
58 | - (void)registerClass:(Class)viewClass forViewReuseIdentifier:(NSString *)identifier;
59 |
60 | @end
61 |
62 |
63 | #pragma mark - LSVRectModel
64 |
65 | @interface LSVRectModel : NSObject
66 | // view转换后的绝对值rect
67 | @property (nonatomic, assign) CGRect absRect;
68 |
69 | // 业务下标，如果初始化时没有提供，LSVRectModel内部会自动生成
70 | @property (nonatomic, copy) NSString *lsvId;
71 |
72 | + (instancetype)modelWithRect:(CGRect)rect;
73 | + (instancetype)modelWithRect:(CGRect)rect lsvId:(NSString *)lsvId;
74 |
75 | @end
76 |
--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView/Classes/LazyScrollView.h:
--------------------------------------------------------------------------------
1 | //
2 | // LazyScrollView.h
3 | // LazyScrollView
4 | //
5 | // Created by xiabob on 16/12/22.
6 | // Copyright © 2016年 xiabob. All rights reserved.
7 | //
8 |
9 | #import
10 | @class LSVRectModel;
11 | @class LazyScrollView;
12 |
13 | typedef NS_ENUM(NSUInteger, LazyScrollViewDirection) {
14 | LazyScrollViewDirectionHorizontal,
15 | LazyScrollViewDirectionVertical,
16 | };
17 |
18 |
19 | #pragma mark - LazyScrollViewDataSource
20 |
21 | @protocol LazyScrollViewDataSource
22 |
23 | @required
24 | /// ScrollView一共展示多少个item
25 | - (NSUInteger)numberOfItemInScrollView:(LazyScrollView *)scrollView;
26 | /// 要求根据index直接返回RectModel
27 | - (LSVRectModel *)scrollView:(LazyScrollView *)scrollView rectModelAtIndex:(NSUInteger)index;
28 | /// 返回下标所对应的view
29 | - (UIView *)scrollView:(LazyScrollView *)scrollView itemByLsvId:(NSString *)lsvId;
30 |
31 | @end
32 |
33 | #pragma mark - LazyScrollViewDelegate
34 |
35 | @protocol LazyScrollViewDelegate
36 |
37 | @optional
38 | ///点击了对应小标的cell
39 | - (void)scrollView:(LazyScrollView *)scrollView didClickItemAtIndex:(NSUInteger)index withLsvId:(NSString *)lsvId;
40 |
41 | @end
42 |
43 |
44 | #pragma mark - LazyScrollView
45 |
46 | @interface LazyScrollView : UIScrollView
47 |
48 | @property (nonatomic, weak) id dataSource;
49 | @property (nonatomic, weak) id delegate;
50 |
51 | /**
52 | * 滚动方向
53 | * 暂时只支持 `LazyScrollViewDirectionVertical`
54 | */
55 | //@property (nonatomic, assign) LazyScrollViewDirection direction;
56 |
57 | - (void)reloadData;
58 | - (UIView *)dequeueReusableItemWithIdentifier:(NSString *)identifier;
59 | - (void)registerClass:(Class)viewClass forViewReuseIdentifier:(NSString *)identifier;
60 |
61 | @end
62 |
63 |
64 | #pragma mark - LSVRectModel
65 |
66 | @interface LSVRectModel : NSObject
67 | /// view转换后的绝对值rect
68 | @property (nonatomic, assign) CGRect absRect;
69 |
70 | /// 业务下标，如果初始化时没有提供，LSVRectModel内部会自动生成
71 | @property (nonatomic, copy) NSString *lsvId;
72 |
73 | + (instancetype)modelWithRect:(CGRect)rect;
74 | + (instancetype)modelWithRect:(CGRect)rect lsvId:(NSString *)lsvId;
75 |
76 | @end
77 |
--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView/AppDelegate.m:
--------------------------------------------------------------------------------
1 | //
2 | // AppDelegate.m
3 | // LazyScrollView
4 | //
5 | // Created by xiabob on 16/12/22.
6 | // Copyright © 2016年 xiabob. All rights reserved.
7 | //
8 |
9 | #import "AppDelegate.h"
10 |
11 | @interface AppDelegate ()
12 |
13 | @end
14 |
15 | @implementation AppDelegate
16 |
17 |
18 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
19 | // Override point for customization after application launch.
20 | return YES;
21 | }
22 |
23 |
24 | - (void)applicationWillResignActive:(UIApplication *)application {
25 | // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
26 | // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
27 | }
28 |
29 |
30 | - (void)applicationDidEnterBackground:(UIApplication *)application {
31 | // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
32 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
33 | }
34 |
35 |
36 | - (void)applicationWillEnterForeground:(UIApplication *)application {
37 | // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
38 | }
39 |
40 |
41 | - (void)applicationDidBecomeActive:(UIApplication *)application {
42 | // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
43 | }
44 |
45 |
46 | - (void)applicationWillTerminate:(UIApplication *)application {
47 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
48 | }
49 |
50 |
51 | @end
52 |
--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView.xcodeproj/xcuserdata/xiabob.xcuserdatad/xcschemes/LazyScrollView.xcscheme:
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--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView/ViewController.m:
--------------------------------------------------------------------------------
1 | //
2 | // ViewController.m
3 | // LazyScrollView
4 | //
5 | // Created by xiabob on 16/12/22.
6 | // Copyright © 2016年 xiabob. All rights reserved.
7 | //
8 |
9 | #import "ViewController.h"
10 | #import "LazyScrollView.h"
11 | #import "SingleView.h"
12 |
13 | @interface ViewController ()
14 |
15 | @property (strong, nonatomic) LazyScrollView *lazyScrollView;
16 | @property (copy, nonatomic) NSArray *rectDatas;
17 | @property (copy, nonatomic) NSDictionary *viewsData;
18 |
19 | @end
20 |
21 | @implementation ViewController
22 |
23 | - (void)loadView {
24 | [super loadView];
25 |
26 | [self loadDatas];
27 | [self configViews];
28 | }
29 |
30 | - (void)viewDidLoad {
31 | [super viewDidLoad];
32 | // Do any additional setup after loading the view, typically from a nib.
33 | }
34 |
35 | - (void)loadDatas {
36 |
37 | NSMutableArray *array = @[].mutableCopy;
38 | NSMutableDictionary *dictionary = @{}.mutableCopy;
39 |
40 | NSMutableArray *rectArray = [[NSMutableArray alloc] init];
41 | //Create a single column layout with 5 elements;
42 | for (int i = 0; i < 500 ; i++) {
43 | [rectArray addObject:[NSValue valueWithCGRect:CGRectMake(10, i *80 + 2 , self.view.bounds.size.width-20, 80-2)]];
44 | }
45 | //Create a double column layout with 10 elements;
46 | for (int i = 0; i < 1000 ; i++) {
47 | [rectArray addObject:[NSValue valueWithCGRect:CGRectMake((i%2)*self.view.bounds.size.width/2 + 3, 41000 + i/2 *80 + 2 , self.view.bounds.size.width/2 -3, 80 - 2)]];
48 | }
49 | //Create a trible column layout with 15 elements;
50 | for (int i = 0; i < 1500 ; i++) {
51 | NSUInteger row = 5;
52 | [rectArray addObject:[NSValue valueWithCGRect:CGRectMake((i%row)*self.view.bounds.size.width/row + 1, 82000 + i/row *80 + 2 , self.view.bounds.size.width/row -4, 80 - 2)]];
53 | }
54 |
55 | for (NSInteger index = 0; index < rectArray.count; ++ index) {
56 | NSString *lsvId = [NSString stringWithFormat:@"%@/%@", @(index / 10), @(index % 10)];
57 | LSVRectModel *model = [LSVRectModel modelWithRect:[(NSValue *)(rectArray[index]) CGRectValue] lsvId:lsvId];
58 | [array addObject:model];
59 | [dictionary setObject:lsvId forKey:lsvId];
60 | }
61 |
62 |
63 | // for (NSInteger index = 0; index < 5000; ++ index) {
64 | // NSString *lsvId = [NSString stringWithFormat:@"%@/%@", @(index / 10), @(index % 10)];
65 | // CGFloat width = ([UIScreen mainScreen].bounds.size.width - 30) / 2;
66 | // LSVRectModel *model = [LSVRectModel modelWithRect:CGRectMake(10 + (index % 2) * (width+10), (index / 2) * (width+10), width, width) lsvId:lsvId];
67 | // [array addObject:model];
68 | // [dictionary setObject:lsvId forKey:lsvId];
69 | // }
70 | self.rectDatas = array;
71 | self.viewsData = dictionary;
72 |
73 | }
74 |
75 | - (void)configViews {
76 |
77 | self.view.backgroundColor = [UIColor whiteColor];
78 |
79 | [self.view addSubview:self.lazyScrollView];
80 | self.lazyScrollView.frame = self.view.bounds;
81 |
82 | }
83 |
84 | - (void)didReceiveMemoryWarning {
85 | [super didReceiveMemoryWarning];
86 | // Dispose of any resources that can be recreated.
87 | }
88 |
89 | #pragma mark - LazyScrollViewDataSource
90 |
91 | - (NSUInteger)numberOfItemInScrollView:(LazyScrollView *)scrollView {
92 | return self.rectDatas.count;
93 | }
94 |
95 | - (LSVRectModel *)scrollView:(LazyScrollView *)scrollView rectModelAtIndex:(NSUInteger)index {
96 |
97 | return self.rectDatas[index];
98 | }
99 |
100 | - (UIView *)scrollView:(LazyScrollView *)scrollView itemByLsvId:(NSString *)lsvId {
101 | SingleView *view;
102 | NSInteger index = [[[lsvId componentsSeparatedByString:@"/"] valueForKeyPath:@"@sum.integerValue"] integerValue];
103 | if (index % 3 == 1) {
104 | view = (SingleView *)[self.lazyScrollView dequeueReusableItemWithIdentifier:kViewIdfSingle1];
105 | view.data = [NSString stringWithFormat:@"Single1 - %@", self.viewsData[lsvId]];
106 | } else if (index % 5 == 2 || index % 5 == 3) {
107 | view = (SingleView *)[self.lazyScrollView dequeueReusableItemWithIdentifier:kViewIdfSingle2];
108 | view.data = [NSString stringWithFormat:@"Single2 - %@", self.viewsData[lsvId]];
109 | } else if (index % 7 == 3 || index % 7 == 2) {
110 | view = (SingleView *)[self.lazyScrollView dequeueReusableItemWithIdentifier:kViewIdfSingle3];
111 | view.data = [NSString stringWithFormat:@"Single3 - %@", self.viewsData[lsvId]];
112 | } else if (index % 7 == 4 || index % 7 == 5) {
113 | view = (SingleView *)[self.lazyScrollView dequeueReusableItemWithIdentifier:kViewIdfSingle4];
114 | view.data = [NSString stringWithFormat:@"Single4 - %@", self.viewsData[lsvId]];
115 | } else {
116 | view = (SingleView *)[self.lazyScrollView dequeueReusableItemWithIdentifier:kViewIdfSingle5];
117 | view.data = [NSString stringWithFormat:@"Single5 - %@", self.viewsData[lsvId]];
118 | }
119 |
120 | return view;
121 | }
122 |
123 | #pragma mark - LazyScrollViewDelegate
124 |
125 | - (void)scrollView:(LazyScrollView *)scrollView didClickItemAtIndex:(NSUInteger)index withLsvId:(NSString *)lsvId {
126 | SingleView *view = (SingleView *)[self scrollView:scrollView itemByLsvId:lsvId];
127 | NSLog(@"didClickItemAtIndex:%@ lsvid:%@ view data:%@", @(index), lsvId, view.data);
128 | [scrollView reloadData];
129 | }
130 |
131 |
132 | #pragma mark - getter
133 |
134 | - (LazyScrollView *)lazyScrollView {
135 | if (!_lazyScrollView) {
136 | _lazyScrollView = [LazyScrollView new];
137 | _lazyScrollView.dataSource = self;
138 | _lazyScrollView.delegate = self;
139 | [_lazyScrollView registerClass:[SingleView class] forViewReuseIdentifier:kViewIdfSingle1];
140 | [_lazyScrollView registerClass:[SingleView class] forViewReuseIdentifier:kViewIdfSingle2];
141 | [_lazyScrollView registerClass:[SingleView class] forViewReuseIdentifier:kViewIdfSingle3];
142 | [_lazyScrollView registerClass:[SingleView class] forViewReuseIdentifier:kViewIdfSingle4];
143 | [_lazyScrollView registerClass:[SingleView class] forViewReuseIdentifier:kViewIdfSingle5];
144 | }
145 | return _lazyScrollView;
146 | }
147 |
148 | - (NSArray *)rectDatas {
149 | if (!_rectDatas) {
150 | _rectDatas = [NSArray array];
151 | }
152 | return _rectDatas;
153 | }
154 |
155 | - (NSDictionary *)viewsData {
156 | if (!_viewsData) {
157 | _viewsData = [NSDictionary dictionary];
158 | }
159 | return _viewsData;
160 | }
161 |
162 | @end
163 |
--------------------------------------------------------------------------------
/Classes/LazyScrollView.m:
--------------------------------------------------------------------------------
1 | //
2 | // LazyScrollView.m
3 | // LazyScrollView
4 | //
5 | // Created by xiabob on 16/12/22.
6 | // Copyright © 2016年 xiabob. All rights reserved.
7 | //
8 |
9 | #import "LazyScrollView.h"
10 | #import
11 |
12 | CGFloat const kBufferSize = 20;
13 |
14 |
15 | #pragma mark - UIView (LSV)
16 |
17 | static char kAssociatedObjectKeylsvId;
18 | static char kAssociatedObjectKeyReuseIdentifier;
19 |
20 | @interface UIView (LSV)
21 |
22 | // 索引过的标识，在LazyScrollView范围内唯一
23 | @property (nonatomic, copy) NSString *lsvId;
24 | // 重用的ID
25 | @property (nonatomic, copy) NSString *reuseIdentifier;
26 |
27 | @end
28 |
29 | @implementation UIView (LSV)
30 | - (NSString *)lsvId {
31 | return objc_getAssociatedObject(self, &kAssociatedObjectKeylsvId);
32 | }
33 |
34 | - (void)setLsvId:(NSString *)lsvId {
35 | objc_setAssociatedObject(self, &kAssociatedObjectKeylsvId, lsvId, OBJC_ASSOCIATION_COPY_NONATOMIC);
36 | }
37 |
38 | - (NSString *)reuseIdentifier {
39 | return objc_getAssociatedObject(self, &kAssociatedObjectKeyReuseIdentifier);
40 | }
41 |
42 | - (void)setReuseIdentifier:(NSString *)reuseIdentifier {
43 | objc_setAssociatedObject(self, &kAssociatedObjectKeyReuseIdentifier, reuseIdentifier, OBJC_ASSOCIATION_COPY_NONATOMIC);
44 | }
45 |
46 | @end
47 |
48 |
49 | #pragma mark - LazyScrollView
50 |
51 | @interface LazyScrollView ()
52 |
53 | @property (nonatomic, strong) NSMutableDictionary *reuseViewPool;
54 | @property (nonatomic, strong) NSMutableSet<__kindof UIView *> *visibleViews;
55 |
56 | @property (nonatomic, strong) NSMutableArray *allRectModels;
57 | @property (nonatomic, strong) NSMutableArray *allAscendingRectModels; //按照view顶部的y升序排列allRectModels
58 | @property (nonatomic, strong) NSMutableArray *allDescendingRectModels; //按照view底部的y降序排列allRectModels
59 |
60 | @property (nonatomic, assign) NSUInteger numberOfItems;
61 |
62 | @property (nonatomic, strong) NSMutableDictionary *registerClass;
63 |
64 | @property (nonatomic, strong) UITapGestureRecognizer *tapGesture;
65 |
66 | @end
67 |
68 | @implementation LazyScrollView
69 |
70 | @dynamic delegate; //消除警告
71 |
72 | - (instancetype)init {
73 | if (self = [super init]) {
74 | [self addGestureRecognizer:self.tapGesture];
75 | }
76 |
77 | return self;
78 | }
79 |
80 | - (void)layoutSubviews {
81 | [super layoutSubviews];
82 | // TOOD: 此处算法待优化
83 | NSMutableArray *newVisibleViews = [self getVisiableViewModels].mutableCopy;
84 | NSMutableArray *newVisibleLsvIds = [newVisibleViews valueForKey:@"lsvId"];
85 | NSMutableArray *removeViews = [NSMutableArray array];
86 | for (UIView *view in self.visibleViews) {
87 | if (![newVisibleLsvIds containsObject:view.lsvId]) {
88 | [removeViews addObject:view];
89 | }
90 | }
91 |
92 | for (UIView *view in removeViews) {
93 | [self.visibleViews removeObject:view];
94 | [self enqueueReusableView:view];
95 | view.hidden = YES;
96 | }
97 |
98 | NSMutableArray *alreadyVisibles = [self.visibleViews valueForKey:@"lsvId"];
99 |
100 | for (LSVRectModel *model in newVisibleViews) {
101 | if ([alreadyVisibles containsObject:model.lsvId]) {
102 | continue;
103 | }
104 | UIView *view = [self.dataSource scrollView:self itemByLsvId:model.lsvId];
105 | view.frame = model.absRect;
106 | view.lsvId = model.lsvId;
107 | view.hidden = NO;
108 |
109 | [self.visibleViews addObject:view];
110 | [self addSubview:view];
111 | }
112 |
113 | }
114 |
115 | - (void)reloadData {
116 | [self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
117 | [self.visibleViews removeAllObjects];
118 |
119 | [self updateAllDatas];
120 | }
121 |
122 | - (void)enqueueReusableView:(UIView *)view {
123 | if (!view.reuseIdentifier) {
124 | return;
125 | }
126 |
127 | NSString *identifier = view.reuseIdentifier;
128 | NSMutableSet *reuseSet = self.reuseViewPool[identifier];
129 | if (!reuseSet) {
130 | reuseSet = [NSMutableSet set];
131 | [self.reuseViewPool setValue:reuseSet forKey:identifier];
132 | }
133 | [reuseSet addObject:view];
134 | }
135 |
136 | - (UIView *)dequeueReusableItemWithIdentifier:(NSString *)identifier {
137 | if (!identifier) {
138 | return nil;
139 | }
140 | NSMutableSet *reuseSet = self.reuseViewPool[identifier];
141 | UIView *view = [reuseSet anyObject];
142 | if (view) {
143 | [reuseSet removeObject:view];
144 | return view;
145 | }
146 | else {
147 | Class viewClass = [self.registerClass objectForKey:identifier];
148 | view = [viewClass new];
149 | view.reuseIdentifier = identifier;
150 | return view;
151 | }
152 | }
153 |
154 | - (void)registerClass:(Class)viewClass forViewReuseIdentifier:(NSString *)identifier {
155 | [self.registerClass setValue:viewClass forKey:identifier];
156 | }
157 |
158 | #pragma mark - Utils
159 |
160 | - (CGFloat)minEdgeOffset {
161 | CGFloat min = CGRectGetMinY(self.bounds);
162 | return MAX(min - kBufferSize, 0);
163 | }
164 |
165 | - (CGFloat)maxEdgeOffset {
166 | CGFloat max = CGRectGetMaxY(self.bounds);
167 | return MIN(max + kBufferSize, self.contentSize.height);
168 | }
169 |
170 | - (LSVRectModel *)findFirstAscendModelWithMinEdge:(CGFloat)minEdge {
171 | // 二分法
172 | NSInteger minIndex = 0;
173 | NSInteger maxIndex = self.allAscendingRectModels.count - 1;
174 | NSInteger midIndex = (minIndex + maxIndex) / 2;
175 | LSVRectModel *model = self.allAscendingRectModels[midIndex];
176 |
177 | while (minIndex < maxIndex - 1) {
178 | if (CGRectGetMinY(model.absRect) > minEdge) {
179 | maxIndex = midIndex;
180 | }
181 | else {
182 | minIndex = midIndex;
183 | }
184 | midIndex = (minIndex + maxIndex) / 2;
185 | model = self.allAscendingRectModels[midIndex];
186 | }
187 |
188 | midIndex = MAX(midIndex - 1, 0);
189 |
190 | return self.allAscendingRectModels[midIndex];
191 | }
192 |
193 | - (LSVRectModel *)findFirstDescendModelWithMaxEdge:(CGFloat)maxEdge {
194 | // 二分法
195 | NSInteger minIndex = 0;
196 | NSInteger maxIndex = self.allDescendingRectModels.count - 1;
197 | NSInteger midIndex = (minIndex + maxIndex) / 2;
198 | LSVRectModel *model = self.allDescendingRectModels[midIndex];
199 |
200 | while (minIndex < maxIndex - 1) {
201 | if (CGRectGetMaxY(model.absRect) < maxEdge) {
202 | maxIndex = midIndex;
203 | }
204 | else {
205 | minIndex = midIndex;
206 | }
207 | midIndex = (minIndex + maxIndex) / 2;
208 | model = self.allDescendingRectModels[midIndex];
209 | }
210 |
211 | midIndex = MAX(midIndex - 1, 0);
212 |
213 | return self.allDescendingRectModels[midIndex];
214 | }
215 |
216 | - (NSArray *)getVisiableViewModels {
217 | // Descend e-----------------|s
218 | // --------------------------- Y值
219 | // s|------------e Ascend
220 | // 实际就是两个firstIndex的交叉部分
221 | LSVRectModel *firstAscendModel = [self findFirstAscendModelWithMinEdge:[self minEdgeOffset]];
222 | LSVRectModel *firstDescendModel = [self findFirstDescendModelWithMaxEdge:[self maxEdgeOffset]];
223 |
224 | NSInteger firstIndex = [self.allAscendingRectModels indexOfObject:firstAscendModel];
225 | firstIndex = MAX(firstIndex-1, 0);
226 | NSInteger lastIndex = [self.allAscendingRectModels indexOfObject:firstDescendModel];
227 | lastIndex = MIN(lastIndex+1, self.allAscendingRectModels.count-1);
228 |
229 | return [self.allAscendingRectModels subarrayWithRange:NSMakeRange(firstIndex, lastIndex-firstIndex+1)];
230 | }
231 |
232 | - (void)updateAllDatas {
233 | [self.allRectModels removeAllObjects];
234 | self.allAscendingRectModels = nil;
235 | self.allDescendingRectModels = nil;
236 |
237 | _numberOfItems = [self.dataSource numberOfItemInScrollView:self];
238 |
239 | for (NSInteger index = 0; index < _numberOfItems; ++ index) {
240 | LSVRectModel *model = [self.dataSource scrollView:self rectModelAtIndex:index];
241 | [self.allRectModels addObject:model];
242 | }
243 |
244 | LSVRectModel *model = self.allAscendingRectModels.lastObject;
245 | self.contentSize = CGSizeMake(CGRectGetWidth(self.bounds), CGRectGetMaxY(model.absRect));
246 | }
247 |
248 | - (void)handleTapAction:(UIGestureRecognizer *)gestureRecognizer {
249 | NSArray *visibleViews = [self getVisiableViewModels];
250 | CGPoint tapPoint = [gestureRecognizer locationInView:self];
251 | for (LSVRectModel *model in visibleViews) {
252 | if (CGRectContainsPoint(model.absRect, tapPoint)) {
253 | if ([self.delegate respondsToSelector:@selector(scrollView:didClickItemAtIndex:)]) {
254 | NSInteger index = [self.allRectModels indexOfObject:model];
255 | [self.delegate scrollView:self didClickItemAtIndex:index];
256 | }
257 |
258 | break;
259 | }
260 | }
261 | }
262 |
263 |
264 | #pragma mark - Setter
265 |
266 | - (void)setDataSource:(id)dataSource {
267 | if (dataSource != _dataSource) {
268 | _dataSource = dataSource;
269 | }
270 | if (_dataSource) {
271 | [self reloadData];
272 | }
273 | }
274 |
275 | #pragma mark - Getter
276 | - (NSMutableDictionary *)reuseViewPool {
277 | if (!_reuseViewPool) {
278 | _reuseViewPool = [NSMutableDictionary new];
279 | }
280 | return _reuseViewPool;
281 | }
282 |
283 | - (NSMutableArray *)allRectModels {
284 | if (!_allRectModels) {
285 | _allRectModels = [NSMutableArray new];
286 | }
287 | return _allRectModels;
288 | }
289 |
290 | - (NSMutableArray *)allAscendingRectModels {
291 | if (!_allAscendingRectModels) {
292 | //升序
293 | _allAscendingRectModels = [[self.allRectModels
294 | sortedArrayUsingComparator:^NSComparisonResult(LSVRectModel *obj1, LSVRectModel *obj2) {
295 | return CGRectGetMinY(obj1.absRect) < CGRectGetMinY(obj2.absRect) ? NSOrderedAscending : NSOrderedDescending;}
296 | ] mutableCopy];
297 | }
298 |
299 | return _allAscendingRectModels;
300 | }
301 |
302 | - (NSMutableArray *)allDescendingRectModels {
303 | if (!_allDescendingRectModels) {
304 | //需要降序，而sortedArrayUsingComparator的结果是ascending order，所以block里面的结果是相反的。
305 | _allDescendingRectModels = [[self.allRectModels
306 | sortedArrayUsingComparator:^NSComparisonResult(LSVRectModel *obj1, LSVRectModel *obj2) {
307 | return CGRectGetMaxY(obj1.absRect) < CGRectGetMaxY(obj2.absRect) ? NSOrderedDescending : NSOrderedAscending;}
308 | ] mutableCopy];
309 | }
310 |
311 | return _allDescendingRectModels;
312 | }
313 |
314 | - (NSMutableDictionary *)registerClass {
315 | if (!_registerClass) {
316 | _registerClass = [NSMutableDictionary new];
317 | }
318 | return _registerClass;
319 | }
320 |
321 | - (NSMutableSet *)visibleViews {
322 | if (!_visibleViews) {
323 | _visibleViews = [NSMutableSet set];
324 | }
325 | return _visibleViews;
326 | }
327 |
328 | - (UITapGestureRecognizer *)tapGesture {
329 | if (!_tapGesture) {
330 | _tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self
331 | action:@selector(handleTapAction:)];
332 | }
333 |
334 | return _tapGesture;
335 | }
336 |
337 | @end
338 |
339 |
340 |
341 | @implementation LSVRectModel
342 |
343 | + (instancetype)modelWithRect:(CGRect)rect lsvId:(NSString *)lsvId {
344 | LSVRectModel *model = [[LSVRectModel alloc] init];
345 | model.absRect = rect;
346 |
347 | if (lsvId.length == 0) {
348 | lsvId = NSStringFromCGRect(rect);
349 | }
350 | model.lsvId = lsvId;
351 |
352 | return model;
353 | }
354 |
355 | + (instancetype)modelWithRect:(CGRect)rect {
356 | return [self modelWithRect:rect lsvId:nil];
357 | }
358 |
359 | @end
360 |
361 |
362 |
363 |
--------------------------------------------------------------------------------
/LazyScrollView/LazyScrollView/Classes/LazyScrollView.m:
--------------------------------------------------------------------------------
1 | //
2 | // LazyScrollView.m
3 | // LazyScrollView
4 | //
5 | // Created by xiabob on 16/12/22.
6 | // Copyright © 2016年 xiabob. All rights reserved.
7 | //
8 |
9 | #import "LazyScrollView.h"
10 | #import
11 |
12 | CGFloat const kBufferSize = 20;
13 |
14 |
15 | #pragma mark - UIView (LSV)
16 |
17 | static char kAssociatedObjectKeylsvId;
18 | static char kAssociatedObjectKeyReuseIdentifier;
19 |
20 | @interface UIView (LSV)
21 |
22 | // 索引过的标识，在LazyScrollView范围内唯一
23 | @property (nonatomic, copy) NSString *lsvId;
24 | // 重用的ID
25 | @property (nonatomic, copy) NSString *reuseIdentifier;
26 |
27 | @end
28 |
29 | @implementation UIView (LSV)
30 | - (NSString *)lsvId {
31 | return objc_getAssociatedObject(self, &kAssociatedObjectKeylsvId);
32 | }
33 |
34 | - (void)setLsvId:(NSString *)lsvId {
35 | objc_setAssociatedObject(self, &kAssociatedObjectKeylsvId, lsvId, OBJC_ASSOCIATION_COPY_NONATOMIC);
36 | }
37 |
38 | - (NSString *)reuseIdentifier {
39 | return objc_getAssociatedObject(self, &kAssociatedObjectKeyReuseIdentifier);
40 | }
41 |
42 | - (void)setReuseIdentifier:(NSString *)reuseIdentifier {
43 | objc_setAssociatedObject(self, &kAssociatedObjectKeyReuseIdentifier, reuseIdentifier, OBJC_ASSOCIATION_COPY_NONATOMIC);
44 | }
45 |
46 | @end
47 |
48 |
49 | #pragma mark - LazyScrollView
50 |
51 | @interface LazyScrollView ()
52 |
53 | @property (nonatomic, strong) NSMutableDictionary *reuseViewPool;
54 | @property (nonatomic, strong) NSMutableSet<__kindof UIView *> *visibleViews;
55 |
56 | @property (nonatomic, strong) NSMutableArray *allRectModels;
57 | @property (nonatomic, strong) NSMutableArray *allAscendingRectModels; //按照view顶部的y升序排列allRectModels
58 | @property (nonatomic, strong) NSMutableArray *allDescendingRectModels; //按照view底部的y降序排列allRectModels
59 |
60 | @property (nonatomic, assign) NSUInteger numberOfItems;
61 |
62 | @property (nonatomic, strong) NSMutableDictionary *registerClass;
63 |
64 | @property (nonatomic, strong) UITapGestureRecognizer *tapGesture;
65 |
66 | @end
67 |
68 | @implementation LazyScrollView
69 |
70 | @dynamic delegate; //消除警告
71 |
72 | - (instancetype)init {
73 | if (self = [super init]) {
74 | [self addGestureRecognizer:self.tapGesture];
75 | }
76 |
77 | return self;
78 | }
79 |
80 | - (void)layoutSubviews {
81 | [super layoutSubviews];
82 |
83 | NSMutableArray *newVisibleViews = [self getVisiableViewModels].mutableCopy;
84 | NSMutableArray *newVisibleLsvIds = [newVisibleViews valueForKey:@"lsvId"];
85 | NSMutableArray *removeViews = [NSMutableArray array];
86 | for (UIView *view in self.visibleViews) {
87 | if (![newVisibleLsvIds containsObject:view.lsvId]) {
88 | [removeViews addObject:view];
89 | }
90 | }
91 |
92 | for (UIView *view in removeViews) {
93 | [self.visibleViews removeObject:view];
94 | [self enqueueReusableView:view];
95 | view.hidden = YES;
96 | }
97 |
98 | NSMutableArray *alreadyVisibles = [self.visibleViews valueForKey:@"lsvId"];
99 |
100 | for (LSVRectModel *model in newVisibleViews) {
101 | if ([alreadyVisibles containsObject:model.lsvId]) {
102 | continue;
103 | }
104 | UIView *view = [self.dataSource scrollView:self itemByLsvId:model.lsvId];
105 | view.frame = model.absRect;
106 | view.lsvId = model.lsvId;
107 | view.hidden = NO;
108 |
109 | [self.visibleViews addObject:view];
110 | [self addSubview:view];
111 | }
112 |
113 | }
114 |
115 | - (void)reloadData {
116 | [self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
117 | [self.visibleViews removeAllObjects];
118 | [self.reuseViewPool removeAllObjects];
119 |
120 | [self updateModelDatas];
121 | }
122 |
123 | - (void)enqueueReusableView:(UIView *)view {
124 | if (!view.reuseIdentifier) {
125 | return;
126 | }
127 |
128 | NSString *identifier = view.reuseIdentifier;
129 | NSMutableSet *reuseSet = self.reuseViewPool[identifier];
130 | if (!reuseSet) {
131 | reuseSet = [NSMutableSet set];
132 | [self.reuseViewPool setValue:reuseSet forKey:identifier];
133 | }
134 | [reuseSet addObject:view];
135 | }
136 |
137 | - (UIView *)dequeueReusableItemWithIdentifier:(NSString *)identifier {
138 | if (!identifier) {
139 | return nil;
140 | }
141 | NSMutableSet *reuseSet = self.reuseViewPool[identifier];
142 | UIView *view = [reuseSet anyObject];
143 | if (view) {
144 | [reuseSet removeObject:view];
145 | return view;
146 | }
147 | else {
148 | Class viewClass = [self.registerClass objectForKey:identifier];
149 | view = [viewClass new];
150 | view.reuseIdentifier = identifier;
151 | return view;
152 | }
153 | }
154 |
155 | - (void)registerClass:(Class)viewClass forViewReuseIdentifier:(NSString *)identifier {
156 | [self.registerClass setValue:viewClass forKey:identifier];
157 | }
158 |
159 | #pragma mark - Utils
160 |
161 | - (CGFloat)minEdgeOffset {
162 | //for UIScrollView the bounds cahnge when scroll
163 | CGFloat min = CGRectGetMinY(self.bounds);
164 | return MAX(min - kBufferSize, 0);
165 | }
166 |
167 | - (CGFloat)maxEdgeOffset {
168 | //for UIScrollView the bounds cahnge when scroll
169 | CGFloat max = CGRectGetMaxY(self.bounds);
170 | return MIN(max + kBufferSize, self.contentSize.height);
171 | }
172 |
173 | - (LSVRectModel *)findFirstAscendModelWithMinEdge:(CGFloat)minEdge {
174 | // 二分法
175 | NSInteger minIndex = 0;
176 | NSInteger maxIndex = self.allAscendingRectModels.count - 1;
177 | NSInteger midIndex = (minIndex + maxIndex) / 2;
178 | LSVRectModel *model = self.allAscendingRectModels[midIndex];
179 |
180 | while (minIndex < midIndex && midIndex < maxIndex) {
181 | if (CGRectGetMinY(model.absRect) > minEdge) {
182 | maxIndex = midIndex;
183 | }
184 | else {
185 | minIndex = midIndex;
186 | }
187 | midIndex = (minIndex + maxIndex) / 2;
188 | model = self.allAscendingRectModels[midIndex];
189 | }
190 |
191 | //处理多个view的y值相同的情况
192 | LSVRectModel *limitModel = model;
193 | while (midIndex > 0 && CGRectGetMinY(model.absRect) == CGRectGetMinY(limitModel.absRect)) {
194 | midIndex = MAX(midIndex - 1, 0);
195 | model = self.allAscendingRectModels[midIndex];
196 | }
197 |
198 | return model;
199 | }
200 |
201 | - (LSVRectModel *)findFirstDescendModelWithMaxEdge:(CGFloat)maxEdge {
202 | // 二分法
203 | NSInteger minIndex = 0;
204 | NSInteger maxIndex = self.allDescendingRectModels.count - 1;
205 | NSInteger midIndex = (minIndex + maxIndex) / 2;
206 | LSVRectModel *model = self.allDescendingRectModels[midIndex];
207 |
208 | while (minIndex < midIndex && midIndex < maxIndex) {
209 | if (CGRectGetMaxY(model.absRect) < maxEdge) {
210 | maxIndex = midIndex;
211 | }
212 | else {
213 | minIndex = midIndex;
214 | }
215 | midIndex = (minIndex + maxIndex) / 2;
216 | model = self.allDescendingRectModels[midIndex];
217 | }
218 |
219 | //处理多个view的y值相同的情况
220 | LSVRectModel *limitModel = model;
221 | while (midIndex > 0 && CGRectGetMaxY(model.absRect) == CGRectGetMaxY(limitModel.absRect)) {
222 | midIndex = MAX(midIndex - 1, 0);
223 | model = self.allDescendingRectModels[midIndex];
224 | }
225 |
226 | return model;
227 | }
228 |
229 | - (NSArray *)getVisiableViewModels {
230 | // Descend e-----------------|s
231 | // --------------------------- Y值
232 | // s|------------e Ascend
233 | // 实际就是两个firstIndex的交叉部分
234 | LSVRectModel *firstAscendModel = [self findFirstAscendModelWithMinEdge:[self minEdgeOffset]];
235 | LSVRectModel *firstDescendModel = [self findFirstDescendModelWithMaxEdge:[self maxEdgeOffset]];
236 |
237 | NSInteger firstIndex = [self.allAscendingRectModels indexOfObject:firstAscendModel];
238 | NSInteger lastIndex = [self.allAscendingRectModels indexOfObject:firstDescendModel];
239 |
240 | return [self.allAscendingRectModels subarrayWithRange:NSMakeRange(firstIndex, lastIndex-firstIndex+1)];
241 | }
242 |
243 | - (void)updateModelDatas {
244 | [self.allRectModels removeAllObjects];
245 | self.allAscendingRectModels = nil;
246 | self.allDescendingRectModels = nil;
247 |
248 | _numberOfItems = [self.dataSource numberOfItemInScrollView:self];
249 |
250 | for (NSInteger index = 0; index < _numberOfItems; ++ index) {
251 | LSVRectModel *model = [self.dataSource scrollView:self rectModelAtIndex:index];
252 | [self.allRectModels addObject:model];
253 | }
254 |
255 | LSVRectModel *model = self.allAscendingRectModels.lastObject;
256 | self.contentSize = CGSizeMake(CGRectGetWidth(self.bounds), CGRectGetMaxY(model.absRect));
257 | }
258 |
259 | - (void)handleTapAction:(UIGestureRecognizer *)gestureRecognizer {
260 | NSArray *visibleViews = [self getVisiableViewModels];
261 | CGPoint tapPoint = [gestureRecognizer locationInView:self];
262 | for (LSVRectModel *model in visibleViews) {
263 | if (CGRectContainsPoint(model.absRect, tapPoint)) {
264 | if ([self.delegate respondsToSelector:@selector(scrollView:didClickItemAtIndex:withLsvId:)]) {
265 | NSInteger index = [self.allRectModels indexOfObject:model];
266 | [self.delegate scrollView:self didClickItemAtIndex:index withLsvId:model.lsvId];
267 | }
268 |
269 | break;
270 | }
271 | }
272 | }
273 |
274 | #pragma mark - Setter
275 |
276 | - (void)setDataSource:(id)dataSource {
277 | if (dataSource != _dataSource) {
278 | _dataSource = dataSource;
279 | }
280 | if (_dataSource) {
281 | [self reloadData];
282 | }
283 | }
284 |
285 | #pragma mark - Getter
286 | - (NSMutableDictionary *)reuseViewPool {
287 | if (!_reuseViewPool) {
288 | _reuseViewPool = [NSMutableDictionary new];
289 | }
290 | return _reuseViewPool;
291 | }
292 |
293 | - (NSMutableArray *)allRectModels {
294 | if (!_allRectModels) {
295 | _allRectModels = [NSMutableArray new];
296 | }
297 | return _allRectModels;
298 | }
299 |
300 | - (NSMutableArray *)allAscendingRectModels {
301 | if (!_allAscendingRectModels) {
302 | //升序
303 | _allAscendingRectModels = [[self.allRectModels
304 | sortedArrayUsingComparator:^NSComparisonResult(LSVRectModel *obj1, LSVRectModel *obj2) {
305 | CGFloat y1 = CGRectGetMaxY(obj1.absRect); CGFloat x1 = CGRectGetMinX(obj1.absRect);
306 | CGFloat y2 = CGRectGetMaxY(obj2.absRect); CGFloat x2 = CGRectGetMinX(obj2.absRect);
307 | if (y1 == y2) {
308 | return x1 <= x2 ? NSOrderedAscending: NSOrderedDescending;
309 | } else {
310 | return y1 < y2 ? NSOrderedAscending : NSOrderedDescending;
311 | } }
312 | ] mutableCopy];
313 | }
314 |
315 | return _allAscendingRectModels;
316 | }
317 |
318 | - (NSMutableArray *)allDescendingRectModels {
319 | if (!_allDescendingRectModels) {
320 | //需要降序，而sortedArrayUsingComparator的结果是ascending order，所以block里面的结果是相反的。
321 | _allDescendingRectModels = [[self.allRectModels
322 | sortedArrayUsingComparator:^NSComparisonResult(LSVRectModel *obj1, LSVRectModel *obj2) {
323 | CGFloat y1 = CGRectGetMaxY(obj1.absRect); CGFloat x1 = CGRectGetMinX(obj1.absRect);
324 | CGFloat y2 = CGRectGetMaxY(obj2.absRect); CGFloat x2 = CGRectGetMinX(obj2.absRect);
325 | if (y1 == y2) {
326 | return x1 <= x2 ? NSOrderedDescending : NSOrderedAscending;
327 | } else {
328 | return y1 < y2 ? NSOrderedDescending : NSOrderedAscending;
329 | }
330 | }
331 | ] mutableCopy];
332 | }
333 |
334 | return _allDescendingRectModels;
335 | }
336 |
337 | - (NSMutableDictionary *)registerClass {
338 | if (!_registerClass) {
339 | _registerClass = [NSMutableDictionary new];
340 | }
341 | return _registerClass;
342 | }
343 |
344 | - (NSMutableSet *)visibleViews {
345 | if (!_visibleViews) {
346 | _visibleViews = [NSMutableSet set];
347 | }
348 | return _visibleViews;
349 | }
350 |
351 | - (UITapGestureRecognizer *)tapGesture {
352 | if (!_tapGesture) {
353 | _tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self
354 | action:@selector(handleTapAction:)];
355 | }
356 |
357 | return _tapGesture;
358 | }
359 |
360 | @end
361 |
362 |
363 | #pragma mark - LSVRectModel
364 |
365 | @implementation LSVRectModel
366 |
367 | + (instancetype)modelWithRect:(CGRect)rect lsvId:(NSString *)lsvId {
368 | LSVRectModel *model = [[LSVRectModel alloc] init];
369 | model.absRect = rect;
370 |
371 | if (lsvId.length == 0) {
372 | lsvId = NSStringFromCGRect(rect);
373 | }
374 | model.lsvId = lsvId;
375 |
376 | return model;
377 | }
378 |
379 | + (instancetype)modelWithRect:(CGRect)rect {
380 | return [self modelWithRect:rect lsvId:nil];
381 | }
382 |
383 | @end
384 |
385 |
386 |
387 |
--------------------------------------------------------------------------------
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341 |
--------------------------------------------------------------------------------