├── .DS_Store
├── .gitignore
├── DMLazyScrollViewExample
    ├── DMLazyScrollView
    │   ├── DMLazyScrollView.h
    │   └── DMLazyScrollView.m
    ├── DMLazyScrollViewExample.xcodeproj
    │   ├── project.pbxproj
    │   ├── project.xcworkspace
    │   │   ├── contents.xcworkspacedata
    │   │   └── xcuserdata
    │   │   │   ├── daniele.xcuserdatad
    │   │   │       ├── UserInterfaceState.xcuserstate
    │   │   │       └── WorkspaceSettings.xcsettings
    │   │   │   └── jack.xcuserdatad
    │   │   │       └── UserInterfaceState.xcuserstate
    │   └── xcuserdata
    │   │   ├── daniele.xcuserdatad
    │   │       ├── xcdebugger
    │   │       │   └── Breakpoints.xcbkptlist
    │   │       └── xcschemes
    │   │       │   ├── DMLazyScrollViewExample.xcscheme
    │   │       │   └── xcschememanagement.plist
    │   │   └── jack.xcuserdatad
    │   │       ├── xcdebugger
    │   │           └── Breakpoints_v2.xcbkptlist
    │   │       └── xcschemes
    │   │           ├── DMLazyScrollViewExample.xcscheme
    │   │           └── xcschememanagement.plist
    └── DMLazyScrollViewExample
    │   ├── DMAppDelegate.h
    │   ├── DMAppDelegate.m
    │   ├── DMLazyScrollViewExample-Info.plist
    │   ├── DMLazyScrollViewExample-Prefix.pch
    │   ├── DMViewController.h
    │   ├── DMViewController.m
    │   ├── Default-568h@2x.png
    │   ├── Default.png
    │   ├── Default@2x.png
    │   ├── en.lproj
    │       ├── DMViewController_iPad.xib
    │       ├── DMViewController_iPhone.xib
    │       └── InfoPlist.strings
    │   └── main.m
└── README.md


/.DS_Store:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/malcommac/DMLazyScrollView/865bf3112b650bf83bcf125f82197256a7418252/.DS_Store


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | /DMLazyScrollViewExample/.DS_Store
2 | .DS_Store


--------------------------------------------------------------------------------
/DMLazyScrollViewExample/DMLazyScrollView/DMLazyScrollView.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DMLazyScrollView.h
 3 | //  Lazy Loading UIScrollView for iOS
 4 | //
 5 | //  Created by Daniele Margutti (me@danielemargutti.com) on 24/11/12.
 6 | //  Copyright (c) 2012 http://www.danielemargutti.com. All rights reserved.
 7 | //  Distribuited under MIT License
 8 | //
 9 | 
10 | #import <UIKit/UIKit.h>
11 | 
12 | @class DMLazyScrollView;
13 | 
14 | enum {
15 |     DMLazyScrollViewDirectionHorizontal =   0,
16 |     DMLazyScrollViewDirectionVertical   =   1,
17 | };typedef NSUInteger DMLazyScrollViewDirection;
18 | 
19 | enum {
20 |     DMLazyScrollViewTransitionAuto      =   0,
21 |     DMLazyScrollViewTransitionForward   =   1,
22 |     DMLazyScrollViewTransitionBackward  =   2
23 | }; typedef NSUInteger DMLazyScrollViewTransition;
24 | 
25 | @protocol DMLazyScrollViewDelegate <NSObject>
26 | @optional
27 | - (void)lazyScrollViewWillBeginDragging:(DMLazyScrollView *)pagingView;
28 | //Called when it scrolls, except from as the result of self-driven animation.
29 | - (void)lazyScrollViewDidScroll:(DMLazyScrollView *)pagingView at:(CGPoint) visibleOffset;
30 | //Called whenever it scrolls: through user manipulation, setup, or self-driven animation.
31 | - (void)lazyScrollViewDidScroll:(DMLazyScrollView *)pagingView at:(CGPoint) visibleOffset withSelfDrivenAnimation:(BOOL)selfDrivenAnimation;
32 | - (void)lazyScrollViewDidEndDragging:(DMLazyScrollView *)pagingView;
33 | - (void)lazyScrollViewWillBeginDecelerating:(DMLazyScrollView *)pagingView;
34 | - (void)lazyScrollViewDidEndDecelerating:(DMLazyScrollView *)pagingView atPageIndex:(NSInteger)pageIndex;
35 | - (void)lazyScrollView:(DMLazyScrollView *)pagingView currentPageChanged:(NSInteger)currentPageIndex;
36 | @end
37 | 
38 | typedef UIViewController*(^DMLazyScrollViewDataSource)(NSUInteger index);
39 | 
40 | @interface DMLazyScrollView : UIScrollView
41 | 
42 | @property (copy)                DMLazyScrollViewDataSource      dataSource;
43 | @property (nonatomic, assign)   id<DMLazyScrollViewDelegate>    controlDelegate;
44 | 
45 | @property (nonatomic,assign)    NSUInteger                      numberOfPages;
46 | @property (readonly)            NSUInteger                      currentPage;
47 | @property (readonly)            DMLazyScrollViewDirection       direction;
48 | 
49 | @property (nonatomic, assign) BOOL autoPlay;
50 | @property (nonatomic, assign) CGFloat autoPlayTime; //default 3 seconds
51 | 
52 | - (id)initWithFrameAndDirection:(CGRect)frame
53 |                       direction:(DMLazyScrollViewDirection)direction
54 |                  circularScroll:(BOOL) circularScrolling;
55 | 
56 | - (void)setEnableCircularScroll:(BOOL)circularScrolling;
57 | - (BOOL)circularScrollEnabled;
58 | 
59 | - (void) reloadData;
60 | 
61 | - (void) setPage:(NSInteger) index animated:(BOOL) animated;
62 | - (void) setPage:(NSInteger) newIndex transition:(DMLazyScrollViewTransition) transition animated:(BOOL) animated;
63 | - (void) moveByPages:(NSInteger) offset animated:(BOOL) animated;
64 | 
65 | - (UIViewController *) visibleViewController;
66 | 
67 | @end
68 | 


--------------------------------------------------------------------------------
/DMLazyScrollViewExample/DMLazyScrollView/DMLazyScrollView.m:
--------------------------------------------------------------------------------
  1 | //
  2 | //  DMLazyScrollView.m
  3 | //  Lazy Loading UIScrollView for iOS
  4 | //
  5 | //  Created by Daniele Margutti (me@danielemargutti.com) on 24/11/12.
  6 | //  Copyright (c) 2012 http://www.danielemargutti.com. All rights reserved.
  7 | //  Distribuited under MIT License
  8 | //
  9 | 
 10 | #import "DMLazyScrollView.h"
 11 | 
 12 | enum {
 13 |     DMLazyScrollViewScrollDirectionBackward     = 0,
 14 |     DMLazyScrollViewScrollDirectionForward      = 1
 15 | }; typedef NSUInteger DMLazyScrollViewScrollDirection;
 16 | 
 17 | #define kDMLazyScrollViewTransitionDuration     0.4
 18 | 
 19 | @interface DMLazyScrollView() <UIScrollViewDelegate> {
 20 |     NSUInteger      numberOfPages;
 21 |     NSUInteger      currentPage;
 22 |     BOOL            isManualAnimating;
 23 |     BOOL            circularScrollEnabled;
 24 | }
 25 | @property (nonatomic, strong) NSTimer* timer_autoPlay;
 26 | @end
 27 | 
 28 | @implementation DMLazyScrollView
 29 | 
 30 | @synthesize numberOfPages,currentPage;
 31 | @synthesize dataSource,controlDelegate;
 32 | @synthesize autoPlay = _autoPlay;
 33 | @synthesize timer_autoPlay = _timer_autoPlay;
 34 | @synthesize autoPlayTime = _autoPlayTime;
 35 | 
 36 | - (id)init {
 37 |     return [self initWithFrame:CGRectZero];
 38 | }
 39 | 
 40 | - (id)initWithFrame:(CGRect)frame
 41 | {
 42 |     return [self initWithFrameAndDirection:frame direction:DMLazyScrollViewDirectionHorizontal circularScroll:NO];
 43 | }
 44 | 
 45 | - (id)initWithFrameAndDirection:(CGRect)frame
 46 |                       direction:(DMLazyScrollViewDirection)direction
 47 |                  circularScroll:(BOOL) circularScrolling {
 48 |     
 49 |     self = [super initWithFrame:frame];
 50 |     if (self) {
 51 |         _direction = direction;
 52 |         circularScrollEnabled = circularScrolling;
 53 |         _autoPlayTime = 3;
 54 |         [self initializeControl];
 55 |     }
 56 |     return self;
 57 | }
 58 | 
 59 | - (void)setAutoPlay:(BOOL)autoPlay
 60 | {
 61 |     _autoPlay = autoPlay;
 62 |     if(self.numberOfPages)
 63 |     {
 64 |         [self reloadData];
 65 |     }
 66 | }
 67 | 
 68 | - (BOOL)hasMultiplePages {
 69 |     return numberOfPages > 1;
 70 | }
 71 | 
 72 | - (void)resetAutoPlay
 73 | {
 74 |     if(_autoPlay)
 75 |     {
 76 |         if(_timer_autoPlay)
 77 |         {
 78 |             [_timer_autoPlay invalidate];
 79 |             _timer_autoPlay = nil;
 80 |         }
 81 |         _timer_autoPlay = [NSTimer scheduledTimerWithTimeInterval:_autoPlayTime target:self selector:@selector(autoPlayHanlde:) userInfo:nil repeats:YES];
 82 |     }
 83 |     else
 84 |     {
 85 |         if(_timer_autoPlay)
 86 |         {
 87 |             [_timer_autoPlay invalidate];
 88 |             _timer_autoPlay = nil;
 89 |         }
 90 |     }
 91 | }
 92 | 
 93 | - (void)autoPlayHanlde:(id)timer
 94 | {
 95 |     if ([self hasMultiplePages]) {
 96 |         [self autoPlayGoToNextPage];
 97 |     }
 98 | }
 99 | 
100 | - (void)autoPlayGoToNextPage
101 | {
102 |     NSInteger nextPage = self.currentPage+1;
103 |     if(nextPage >= self.numberOfPages)
104 |     {
105 |         nextPage = 0;
106 |     }
107 |     [self setPage:nextPage animated:YES];
108 | }
109 | 
110 | - (void)autoPlayPause
111 | {
112 |     if(_timer_autoPlay)
113 |     {
114 |         [_timer_autoPlay invalidate];
115 |         _timer_autoPlay = nil;
116 |     }
117 | }
118 | 
119 | - (void)autoPlayResume
120 | {
121 |     [self resetAutoPlay];
122 | }
123 | 
124 | - (void)setEnableCircularScroll:(BOOL)circularScrolling
125 | {
126 |     circularScrollEnabled = circularScrolling;
127 | }
128 | 
129 | - (BOOL)circularScrollEnabled
130 | {
131 |     return circularScrollEnabled;
132 | }
133 | 
134 | - (void) awakeFromNib {
135 |     [self initializeControl];
136 | }
137 | 
138 | - (void) initializeControl {
139 |     self.showsHorizontalScrollIndicator = NO;
140 |     self.showsVerticalScrollIndicator = NO;
141 |     self.pagingEnabled = YES;
142 |     self.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
143 |     self.delegate = self;
144 |     self.contentSize = CGSizeMake(self.frame.size.width, self.contentSize.height);
145 |     currentPage = NSNotFound;
146 | }
147 | 
148 | - (void) setNumberOfPages:(NSUInteger)pages {
149 |     if (pages != numberOfPages) {
150 |         numberOfPages = pages;
151 |         int offset = [self hasMultiplePages] ? numberOfPages + 2 : 1;
152 |         if (_direction == DMLazyScrollViewDirectionHorizontal) {
153 |             self.contentSize = CGSizeMake(self.frame.size.width * offset,
154 |                                           self.contentSize.height);
155 |         } else {
156 |             self.contentSize = CGSizeMake(self.frame.size.width,
157 |                                           self.frame.size.height * offset);
158 |         }
159 |         [self reloadData];
160 |     }
161 | }
162 | 
163 | - (void) reloadData {
164 |     [self setCurrentViewController:0];
165 |     [self resetAutoPlay];
166 | }
167 | 
168 | - (void) layoutSubviews {
169 |     [super layoutSubviews];
170 | }
171 | 
172 | - (CGRect) visibleRect {
173 |     CGRect visibleRect;
174 |     visibleRect.origin = self.contentOffset;
175 |     visibleRect.size = self.bounds.size;
176 |     return visibleRect;
177 | }
178 | 
179 | - (CGPoint) createPoint:(CGFloat) size {
180 |     if (_direction == DMLazyScrollViewDirectionHorizontal) {
181 |         return CGPointMake(size, 0);
182 |     } else {
183 |         return CGPointMake(0, size);
184 |     }
185 | }
186 | 
187 | -(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
188 |     self.bounces = YES;
189 |     if (nil != controlDelegate && [controlDelegate respondsToSelector:@selector(lazyScrollViewDidEndDragging:)])
190 |         [controlDelegate lazyScrollViewDidEndDragging:self];
191 |     [self autoPlayResume];
192 | }
193 | 
194 | 
195 | - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
196 |     [self autoPlayPause];
197 |     if (nil != controlDelegate && [controlDelegate respondsToSelector:@selector(lazyScrollViewWillBeginDragging:)])
198 |         [controlDelegate lazyScrollViewWillBeginDragging:self];
199 | }
200 | 
201 | - (void) scrollViewDidScroll:(UIScrollView *)scrollView {
202 |     if (isManualAnimating) {
203 |         if (nil != controlDelegate && [controlDelegate respondsToSelector:@selector(lazyScrollViewDidScroll:at:withSelfDrivenAnimation:)]) {
204 |             [controlDelegate lazyScrollViewDidScroll:self at:[self visibleRect].origin withSelfDrivenAnimation:YES];
205 |         }
206 |         return;
207 |     }
208 |     
209 |     CGFloat offset = (_direction==DMLazyScrollViewDirectionHorizontal) ? scrollView.contentOffset.x : scrollView.contentOffset.y;
210 |     CGFloat size =(_direction==DMLazyScrollViewDirectionHorizontal) ? self.frame.size.width : self.frame.size.height;
211 |     
212 |     
213 |     // with two pages only scrollview you can only go forward
214 |     // (this prevents us to have a glitch with the next UIView (it can't be placed in two positions at the same time)
215 |     DMLazyScrollViewScrollDirection proposedScroll = (offset <= (size*2) ?
216 |                                                       DMLazyScrollViewScrollDirectionBackward : // we're moving back
217 |                                                       DMLazyScrollViewScrollDirectionForward); // we're moving forward
218 | 
219 |     // you can go back if circular mode is enabled or your current page is not the first page
220 |     BOOL canScrollBackward = (circularScrollEnabled || (!circularScrollEnabled && self.currentPage != 0));
221 |     // you can go forward if circular mode is enabled and current page is not the last page
222 |     BOOL canScrollForward = (circularScrollEnabled || (!circularScrollEnabled && self.currentPage < (self.numberOfPages-1)));
223 |     
224 |     NSInteger prevPage = [self pageIndexByAdding:-1 from:self.currentPage];
225 |     NSInteger nextPage = [self pageIndexByAdding:+1 from:self.currentPage];
226 |     if (prevPage == nextPage) {
227 |         // This happends when our scrollview have only two and we should have the same prev/next page at left/right
228 |         // A single UIView instance can't be in two different location at the same moment so we need to place it
229 |         // loooking at proposed direction
230 |         [self loadControllerAtIndex:prevPage andPlaceAtIndex:(proposedScroll == DMLazyScrollViewScrollDirectionBackward ? -1 : 1)];
231 |     }
232 | 
233 |     if ( (proposedScroll == DMLazyScrollViewScrollDirectionBackward && !canScrollBackward) ||
234 |          (proposedScroll == DMLazyScrollViewScrollDirectionForward && !canScrollForward)) {
235 |         self.bounces = NO;
236 |         [scrollView setContentOffset:[self createPoint:size*2] animated:NO];
237 |         return;
238 |     } else self.bounces = YES;
239 | 
240 |     NSInteger newPageIndex = currentPage;
241 |     
242 |     if (offset <= size)
243 |         newPageIndex = [self pageIndexByAdding:-1 from:currentPage];
244 |     else if (offset >= (size*3))
245 |         newPageIndex = [self pageIndexByAdding:+1 from:currentPage];
246 |     
247 |     [self setCurrentViewController:newPageIndex];
248 |     
249 |     // alert delegate
250 |     if (nil != controlDelegate && [controlDelegate respondsToSelector:@selector(lazyScrollViewDidScroll:at:withSelfDrivenAnimation:)]) {
251 |         [controlDelegate lazyScrollViewDidScroll:self at:[self visibleRect].origin withSelfDrivenAnimation:NO];
252 |     }
253 |     else if (nil != controlDelegate && [controlDelegate respondsToSelector:@selector(lazyScrollViewDidScroll:at:)]) {
254 |         [controlDelegate lazyScrollViewDidScroll:self at:[self visibleRect].origin];
255 |     }
256 | }
257 | 
258 | - (void) setCurrentViewController:(NSInteger) index {
259 |     if (index == currentPage) return;
260 |     currentPage = index;
261 |     
262 |     [self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
263 |     
264 |     NSInteger prevPage = [self pageIndexByAdding:-1 from:currentPage];
265 |     NSInteger nextPage = [self pageIndexByAdding:+1 from:currentPage];
266 |     
267 |     [self loadControllerAtIndex:index andPlaceAtIndex:0];
268 |     // Pre-load the content for the adjacent pages if multiple pages are to be displayed
269 |     if ([self hasMultiplePages]) {
270 |         [self loadControllerAtIndex:prevPage andPlaceAtIndex:-1];   // load previous page
271 |         [self loadControllerAtIndex:nextPage andPlaceAtIndex:1];   // load next page
272 |     }
273 | 
274 |     CGFloat size =(_direction==DMLazyScrollViewDirectionHorizontal) ? self.frame.size.width : self.frame.size.height;
275 |     
276 |     self.contentOffset = [self createPoint:size * ([self hasMultiplePages] ? 2 : 0)]; // recenter
277 |     
278 |     if ([self.controlDelegate respondsToSelector:@selector(lazyScrollView:currentPageChanged:)])
279 |         [self.controlDelegate lazyScrollView:self currentPageChanged:self.currentPage];
280 | }
281 | 
282 | - (UIViewController *) visibleViewController {
283 |     __block UIView *visibleView = nil;
284 |     [self.subviews enumerateObjectsUsingBlock:^(UIView *subView, NSUInteger idx, BOOL *stop) {
285 |         if (CGRectIntersectsRect([self visibleRect], subView.frame)) {
286 |             visibleView = subView;
287 |             *stop = YES;
288 |         }
289 |     }];
290 |     if (visibleView == nil) return nil;
291 |     return [self viewControllerFromView:visibleView];
292 | }
293 | 
294 | - (UIViewController *) viewControllerFromView:(UIView*) targetView {
295 |     return (UIViewController *)[self traverseResponderChainForUIViewController:targetView];
296 | }
297 | 
298 | - (id) traverseResponderChainForUIViewController:(UIView *) targetView {
299 |     id nextResponder = [targetView nextResponder];
300 |     if ([nextResponder isKindOfClass:[UIViewController class]]) {
301 |         return nextResponder;
302 |     } else if ([nextResponder isKindOfClass:[UIView class]]) {
303 |         return [nextResponder traverseResponderChainForUIViewController:targetView];
304 |     } else {
305 |         return nil;
306 |     }
307 | }
308 | 
309 | - (NSInteger) pageIndexByAdding:(NSInteger) offset from:(NSInteger) index {
310 |     // Complicated stuff with negative modulo
311 |     while (offset<0) offset += numberOfPages;
312 |     return (numberOfPages+index+offset) % numberOfPages;
313 | 
314 | }
315 | 
316 | - (void) moveByPages:(NSInteger) offset animated:(BOOL) animated {
317 |     NSUInteger finalIndex = [self pageIndexByAdding:offset from:self.currentPage];
318 |     DMLazyScrollViewTransition transition = (offset >= 0 ?  DMLazyScrollViewTransitionForward :
319 |                                              DMLazyScrollViewTransitionBackward);
320 |     [self setPage:finalIndex transition:transition animated:animated];
321 | }
322 | 
323 | - (void) setPage:(NSInteger) newIndex animated:(BOOL) animated {
324 |     [self setPage:newIndex transition:DMLazyScrollViewTransitionForward animated:animated];
325 | }
326 | 
327 | - (void) setPage:(NSInteger) newIndex transition:(DMLazyScrollViewTransition) transition animated:(BOOL) animated {
328 |     if (newIndex == currentPage) return;
329 |     
330 |     if (animated) {
331 |         //BOOL isOnePageMove = (abs(self.currentPage-newIndex) == 1);
332 |         CGPoint finalOffset;
333 |         
334 |         if (transition == DMLazyScrollViewTransitionAuto) {
335 |             if (newIndex > self.currentPage) transition = DMLazyScrollViewTransitionForward;
336 |             else if (newIndex < self.currentPage) transition = DMLazyScrollViewTransitionBackward;
337 |         }
338 |         
339 |         CGFloat size =(_direction==DMLazyScrollViewDirectionHorizontal) ? self.frame.size.width : self.frame.size.height;
340 |         
341 |         if (transition == DMLazyScrollViewTransitionForward) {
342 |             //if (!isOnePageMove)
343 |                 //[self loadControllerAtIndex:newIndex andPlaceAtIndex:2];
344 |             [self loadControllerAtIndex:newIndex andPlaceAtIndex:1];
345 |             
346 |             //finalOffset = [self createPoint:(size*(isOnePageMove ? 3 : 4))];
347 |             finalOffset = [self createPoint:(size*3)];
348 |         } else {
349 |             //if (!isOnePageMove)
350 |                 //[self loadControllerAtIndex:newIndex andPlaceAtIndex:-2];
351 |             [self loadControllerAtIndex:newIndex andPlaceAtIndex:-1];
352 |             
353 |             //finalOffset = [self createPoint:(size*(isOnePageMove ? 1 : 0))];
354 |             finalOffset = [self createPoint:(size*1)];
355 |         }
356 |         isManualAnimating = YES;
357 |         
358 |         [UIView animateWithDuration:kDMLazyScrollViewTransitionDuration
359 |                               delay:0.0
360 |                             options:UIViewAnimationOptionCurveEaseInOut
361 |                          animations:^{
362 |                              self.contentOffset = finalOffset;
363 |                          } completion:^(BOOL finished) {
364 |                              if (!finished) return;
365 |                              [self setCurrentViewController:newIndex];
366 |                              isManualAnimating = NO;
367 |                          }];
368 |     } else {
369 |         [self setCurrentViewController:newIndex];
370 |     }
371 | }
372 | 
373 | - (void) setCurrentPage:(NSUInteger)newCurrentPage {
374 |     [self setCurrentViewController:newCurrentPage];
375 | }
376 | 
377 | - (UIViewController *) loadControllerAtIndex:(NSInteger) index andPlaceAtIndex:(NSInteger) destIndex {
378 |     UIViewController *viewController = dataSource(index);
379 |     viewController.view.tag = 0;
380 |     
381 |     CGRect viewFrame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
382 |     int offset = [self hasMultiplePages] ? 2 : 0;
383 |     if (_direction == DMLazyScrollViewDirectionHorizontal) {
384 |         viewFrame = CGRectOffset(viewFrame, self.frame.size.width * (destIndex + offset), 0);
385 |     } else {
386 |         viewFrame = CGRectOffset(viewFrame, 0, self.frame.size.height * (destIndex + offset));
387 |     }
388 |     viewController.view.frame = viewFrame;
389 |     
390 |     [self addSubview:viewController.view];
391 |     return viewController;
392 | }
393 | 
394 | 
395 | - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {
396 |     if (nil != controlDelegate && [controlDelegate respondsToSelector:@selector(lazyScrollViewWillBeginDecelerating:)])
397 |         [controlDelegate lazyScrollViewWillBeginDecelerating:self];
398 | }
399 | 
400 | - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
401 |     if (nil != controlDelegate && [controlDelegate respondsToSelector:@selector(lazyScrollViewDidEndDecelerating:atPageIndex:)])
402 |         [controlDelegate lazyScrollViewDidEndDecelerating:self atPageIndex:self.currentPage];
403 | }
404 | 
405 | 
406 | @end
407 | 


--------------------------------------------------------------------------------
/DMLazyScrollViewExample/DMLazyScrollViewExample.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
  1 | // !$*UTF8*$!
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  5 | 	};
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43 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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 7 | 		<key>DMLazyScrollViewExample.xcscheme</key>
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10 | 			<integer>0</integer>
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 7 |       buildImplicitDependencies = "YES">
 8 |       <BuildActionEntries>
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10 |             buildForTesting = "YES"
11 |             buildForRunning = "YES"
12 |             buildForProfiling = "YES"
13 |             buildForArchiving = "YES"
14 |             buildForAnalyzing = "YES">
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29 |       buildConfiguration = "Debug">
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38 |             ReferencedContainer = "container:DMLazyScrollViewExample.xcodeproj">
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43 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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53 |             BuildableIdentifier = "primary"
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 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>DMLazyScrollViewExample.xcscheme</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | 	<key>SuppressBuildableAutocreation</key>
14 | 	<dict>
15 | 		<key>64E7A27D1660D05F00DB5D9E</key>
16 | 		<dict>
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18 | 			<true/>
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21 | </dict>
22 | </plist>
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/DMLazyScrollViewExample/DMLazyScrollViewExample/DMAppDelegate.h:
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 1 | //
 2 | //  DMAppDelegate.h
 3 | //  DMLazyScrollViewExample
 4 | //
 5 | //  Created by Daniele Margutti (me@danielemargutti.com) on 24/11/12.
 6 | //  Copyright (c) 2012 http://www.danielemargutti.com. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @class DMViewController;
12 | 
13 | @interface DMAppDelegate : UIResponder <UIApplicationDelegate>
14 | 
15 | @property (strong, nonatomic) UIWindow *window;
16 | 
17 | @property (strong, nonatomic) DMViewController *viewController;
18 | 
19 | @end
20 | 


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/DMLazyScrollViewExample/DMLazyScrollViewExample/DMAppDelegate.m:
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 1 | //
 2 | //  DMAppDelegate.m
 3 | //  DMLazyScrollViewExample
 4 | //
 5 | //  Created by Daniele Margutti (me@danielemargutti.com) on 24/11/12.
 6 | //  Copyright (c) 2012 http://www.danielemargutti.com. All rights reserved.
 7 | //
 8 | 
 9 | #import "DMAppDelegate.h"
10 | 
11 | #import "DMViewController.h"
12 | 
13 | @implementation DMAppDelegate
14 | 
15 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
16 | {
17 |     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
18 |     // Override point for customization after application launch.
19 |     if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
20 |         self.viewController = [[DMViewController alloc] initWithNibName:@"DMViewController_iPhone" bundle:nil];
21 |     } else {
22 |         self.viewController = [[DMViewController alloc] initWithNibName:@"DMViewController_iPad" bundle:nil];
23 |     }
24 |     self.window.rootViewController = self.viewController;
25 |     [self.window makeKeyAndVisible];
26 |     return YES;
27 | }
28 | 
29 | - (void)applicationWillResignActive:(UIApplication *)application
30 | {
31 |     // 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.
32 |     // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
33 | }
34 | 
35 | - (void)applicationDidEnterBackground:(UIApplication *)application
36 | {
37 |     // 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. 
38 |     // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
39 | }
40 | 
41 | - (void)applicationWillEnterForeground:(UIApplication *)application
42 | {
43 |     // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
44 | }
45 | 
46 | - (void)applicationDidBecomeActive:(UIApplication *)application
47 | {
48 |     // 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.
49 | }
50 | 
51 | - (void)applicationWillTerminate:(UIApplication *)application
52 | {
53 |     // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
54 | }
55 | 
56 | @end
57 | 


--------------------------------------------------------------------------------
/DMLazyScrollViewExample/DMLazyScrollViewExample/DMLazyScrollViewExample-Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleDisplayName</key>
 8 | 	<string>${PRODUCT_NAME}</string>
 9 | 	<key>CFBundleExecutable</key>
10 | 	<string>${EXECUTABLE_NAME}</string>
11 | 	<key>CFBundleIdentifier</key>
12 | 	<string>danielemargutti.${PRODUCT_NAME:rfc1034identifier}</string>
13 | 	<key>CFBundleInfoDictionaryVersion</key>
14 | 	<string>6.0</string>
15 | 	<key>CFBundleName</key>
16 | 	<string>${PRODUCT_NAME}</string>
17 | 	<key>CFBundlePackageType</key>
18 | 	<string>APPL</string>
19 | 	<key>CFBundleShortVersionString</key>
20 | 	<string>1.0</string>
21 | 	<key>CFBundleSignature</key>
22 | 	<string>????</string>
23 | 	<key>CFBundleVersion</key>
24 | 	<string>1.0</string>
25 | 	<key>LSRequiresIPhoneOS</key>
26 | 	<true/>
27 | 	<key>UIRequiredDeviceCapabilities</key>
28 | 	<array>
29 | 		<string>armv7</string>
30 | 	</array>
31 | 	<key>UISupportedInterfaceOrientations</key>
32 | 	<array>
33 | 		<string>UIInterfaceOrientationPortrait</string>
34 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
35 | 		<string>UIInterfaceOrientationLandscapeRight</string>
36 | 	</array>
37 | 	<key>UISupportedInterfaceOrientations~ipad</key>
38 | 	<array>
39 | 		<string>UIInterfaceOrientationPortrait</string>
40 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
41 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
42 | 		<string>UIInterfaceOrientationLandscapeRight</string>
43 | 	</array>
44 | </dict>
45 | </plist>
46 | 


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/DMLazyScrollViewExample/DMLazyScrollViewExample/DMLazyScrollViewExample-Prefix.pch:
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 1 | //
 2 | // Prefix header for all source files of the 'DMLazyScrollViewExample' target in the 'DMLazyScrollViewExample' project
 3 | //
 4 | 
 5 | #import <Availability.h>
 6 | 
 7 | #ifndef __IPHONE_4_0
 8 | #warning "This project uses features only available in iOS SDK 4.0 and later."
 9 | #endif
10 | 
11 | #ifdef __OBJC__
12 |     #import <UIKit/UIKit.h>
13 |     #import <Foundation/Foundation.h>
14 | #endif
15 | 


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/DMLazyScrollViewExample/DMLazyScrollViewExample/DMViewController.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DMViewController.h
 3 | //  DMLazyScrollViewExample
 4 | //
 5 | //  Created by Daniele Margutti (me@danielemargutti.com) on 24/11/12.
 6 | //  Copyright (c) 2012 http://www.danielemargutti.com. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface DMViewController : UIViewController
12 | 
13 | @end
14 | 


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/DMLazyScrollViewExample/DMLazyScrollViewExample/DMViewController.m:
--------------------------------------------------------------------------------
  1 | //
  2 | //  DMViewController.m
  3 | //  DMLazyScrollViewExample
  4 | //
  5 | //  Created by Daniele Margutti (me@danielemargutti.com) on 24/11/12.
  6 | //  Copyright (c) 2012 http://www.danielemargutti.com. All rights reserved.
  7 | //
  8 | 
  9 | #import "DMViewController.h"
 10 | #import "DMLazyScrollView.h"
 11 | 
 12 | #define ARC4RANDOM_MAX	0x100000000
 13 | 
 14 | 
 15 | @interface DMViewController () <DMLazyScrollViewDelegate> {
 16 |     DMLazyScrollView* lazyScrollView;
 17 |     NSMutableArray*    viewControllerArray;
 18 | }
 19 | @end
 20 | 
 21 | @implementation DMViewController
 22 | 
 23 | - (void)viewDidLoad {
 24 |     [super viewDidLoad];
 25 |     
 26 |     // PREPARE PAGES
 27 |     NSUInteger numberOfPages = 10;
 28 |     viewControllerArray = [[NSMutableArray alloc] initWithCapacity:numberOfPages];
 29 |     for (NSUInteger k = 0; k < numberOfPages; ++k) {
 30 |         [viewControllerArray addObject:[NSNull null]];
 31 |     }
 32 |     
 33 |     // PREPARE LAZY VIEW
 34 |     CGRect rect = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height-50);
 35 |     lazyScrollView = [[DMLazyScrollView alloc] initWithFrame:rect];
 36 |     [lazyScrollView setEnableCircularScroll:YES];
 37 |     [lazyScrollView setAutoPlay:YES];
 38 |     
 39 |     __weak __typeof(&*self)weakSelf = self;
 40 |     lazyScrollView.dataSource = ^(NSUInteger index) {
 41 |         return [weakSelf controllerAtIndex:index];
 42 |     };
 43 |     lazyScrollView.numberOfPages = numberOfPages;
 44 |    // lazyScrollView.controlDelegate = self;
 45 |     [self.view addSubview:lazyScrollView];
 46 |     
 47 |     // MOVE BY 3 FORWARD
 48 |     UIButton*btn_moveForward = [UIButton buttonWithType:UIButtonTypeRoundedRect];
 49 |     [btn_moveForward setTitle:@"MOVE BY 3" forState:UIControlStateNormal];
 50 |     [btn_moveForward addTarget:self action:@selector(btn_moveForward:) forControlEvents:UIControlEventTouchUpInside];
 51 |     [btn_moveForward setFrame:CGRectMake(self.view.frame.size.width/2.0f,lazyScrollView.frame.origin.y+lazyScrollView.frame.size.height+5, 320/2.0f,40)];
 52 |     [self.view addSubview:btn_moveForward];
 53 |     
 54 |     // MOVE BY -3 BACKWARD
 55 |     UIButton*btn_moveBackward = [UIButton buttonWithType:UIButtonTypeRoundedRect];
 56 |     [btn_moveBackward setTitle:@"MOVE BY -3" forState:UIControlStateNormal];
 57 |     [btn_moveBackward addTarget:self action:@selector(btn_moveBack:) forControlEvents:UIControlEventTouchUpInside];
 58 |     [btn_moveBackward setFrame:CGRectMake(0,lazyScrollView.frame.origin.y+lazyScrollView.frame.size.height+5, 320/2.0f,40)];
 59 |     [self.view addSubview:btn_moveBackward];
 60 | 	// Do any additional setup after loading the view, typically from a nib.
 61 | }
 62 | 
 63 | - (void) btn_moveBack:(id) sender {
 64 |     [lazyScrollView moveByPages:-3 animated:YES];
 65 | }
 66 | 
 67 | - (void) btn_moveForward:(id) sender {
 68 |     [lazyScrollView moveByPages:3 animated:YES];
 69 | }
 70 | 
 71 | - (void)didReceiveMemoryWarning {
 72 |     [super didReceiveMemoryWarning];
 73 |     // Dispose of any resources that can be recreated.
 74 |     
 75 |     
 76 | }
 77 | 
 78 | - (UIViewController *) controllerAtIndex:(NSInteger) index {
 79 |     if (index > viewControllerArray.count || index < 0) return nil;
 80 |     id res = [viewControllerArray objectAtIndex:index];
 81 |     if (res == [NSNull null]) {
 82 |         UIViewController *contr = [[UIViewController alloc] init];
 83 |         contr.view.backgroundColor = [UIColor colorWithRed: (CGFloat)arc4random()/ARC4RANDOM_MAX
 84 |                                                       green: (CGFloat)arc4random()/ARC4RANDOM_MAX
 85 |                                                        blue: (CGFloat)arc4random()/ARC4RANDOM_MAX
 86 |                                                      alpha: 1.0f];
 87 |         
 88 |         UILabel* label = [[UILabel alloc] initWithFrame:contr.view.bounds];
 89 |         label.backgroundColor = [UIColor clearColor];
 90 |         label.text = [NSString stringWithFormat:@"%d",index];
 91 |         label.textAlignment = NSTextAlignmentCenter;
 92 |         label.font = [UIFont boldSystemFontOfSize:50];
 93 |         [contr.view addSubview:label];
 94 |         
 95 |         [viewControllerArray replaceObjectAtIndex:index withObject:contr];
 96 |         return contr;
 97 |     }
 98 |     return res;
 99 | }
100 | 
101 | /*
102 | - (void)lazyScrollViewDidEndDragging:(DMLazyScrollView *)pagingView {
103 |     NSLog(@"Now visible: %@",lazyScrollView.visibleViewController);
104 | }
105 | */
106 | @end
107 | 


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  1 | <?xml version="1.0" encoding="UTF-8"?>
  2 | <archive type="com.apple.InterfaceBuilder3.CocoaTouch.iPad.XIB" version="8.00">
  3 | 	<data>
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  5 | 		<string key="IBDocument.SystemVersion">12A206j</string>
  6 | 		<string key="IBDocument.InterfaceBuilderVersion">2519</string>
  7 | 		<string key="IBDocument.AppKitVersion">1172.1</string>
  8 | 		<string key="IBDocument.HIToolboxVersion">613.00</string>
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 31 | 				<string key="targetRuntimeIdentifier">IBIPadFramework</string>
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 34 | 				<reference key="NSNextResponder"/>
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/DMLazyScrollViewExample/DMLazyScrollViewExample/en.lproj/InfoPlist.strings:
--------------------------------------------------------------------------------
1 | /* Localized versions of Info.plist keys */
2 | 
3 | 


--------------------------------------------------------------------------------
/DMLazyScrollViewExample/DMLazyScrollViewExample/main.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  main.m
 3 | //  DMLazyScrollViewExample
 4 | //
 5 | //  Created by Daniele Margutti (me@danielemargutti.com) on 24/11/12.
 6 | //  Copyright (c) 2012 http://www.danielemargutti.com. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | #import "DMAppDelegate.h"
12 | 
13 | int main(int argc, char *argv[])
14 | {
15 |     @autoreleasepool {
16 |         return UIApplicationMain(argc, argv, nil, NSStringFromClass([DMAppDelegate class]));
17 |     }
18 | }
19 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | DMLazyScrollView : Lazy Loading UIScrollView (with infinite page scrolling)
 2 | ================
 3 | 
 4 | DMLazyScrollView for iOS (with support for infinite scrolling) allows you to create and endless (in both horizontal and vertical direction) UIScrollView organized in pages and load UIViews dynamically only when needed by reducing time and memory consumption.
 5 | 
 6 | When you have lots of UIViews to show inside a scroll view you don't want to waste memory and time by creating a big UIScrollView content view, load all subviews at the same time and show them; it does not make sense and it's slow on older devices.
 7 | 
 8 | DMLazyScrollView allows you to load lazily UIViews and animate page scrolling easily. You can use it to load images or entire views without pain.
 9 | 
10 | ![DMLazyScrollView Example Project](http://i.imgur.com/lhmdn.png)
11 | 
12 | 
13 | ## Donations
14 | 
15 | If you found this project useful, please donate.
16 | There’s no expected amount and I don’t require you to.
17 | [MAKE YOUR DONATION](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=GS3DBQ69ZBKWJ)
18 | 
19 | ## License (MIT)
20 | 
21 | Copyright (c) 2012 Daniele Margutti
22 | 
23 | Permission is hereby granted, free of charge, to any person
24 | obtaining a copy of this software and associated documentation
25 | files (the "Software"), to deal in the Software without
26 | restriction, including without limitation the rights to use,
27 | copy, modify, merge, publish, distribute, sublicense, and/or sell
28 | copies of the Software, and to permit persons to whom the
29 | Software is furnished to do so, subject to the following
30 | conditions:
31 | 
32 | The above copyright notice and this permission notice shall be
33 | included in all copies or substantial portions of the Software.
34 | 
35 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
36 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
37 | OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
38 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
39 | HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
40 | WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
41 | FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
42 | OTHER DEALINGS IN THE SOFTWARE.
43 | 


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