├── images └── image1.jpg ├── Example ├── IBScrollViewFloatingHeader │ ├── en.lproj │ │ └── InfoPlist.strings │ ├── IBAppDelegate.h │ ├── main.m │ ├── IBScrollViewFloatingHeader-Prefix.pch │ ├── IBViewController.h │ ├── IBScrollViewFloatingHeader │ │ ├── UIScrollView+IBFloatingHeader.h │ │ └── UIScrollView+IBFloatingHeader.m │ ├── Images.xcassets │ │ ├── AppIcon.appiconset │ │ │ └── Contents.json │ │ └── LaunchImage.launchimage │ │ │ └── Contents.json │ ├── IBScrollViewFloatingHeader-Info.plist │ ├── IBViewController.m │ ├── IBAppDelegate.m │ └── Base.lproj │ │ ├── Main_iPhone.storyboard │ │ └── Main_iPad.storyboard └── IBScrollViewFloatingHeader.xcodeproj │ ├── project.xcworkspace │ └── contents.xcworkspacedata │ └── project.pbxproj ├── .gitignore ├── IBScrollViewFloatingHeader ├── UIScrollView+IBFloatingHeader.h └── UIScrollView+IBFloatingHeader.m ├── README.md └── LICENSE.md /images/image1.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ivanbruel/IBScrollViewFloatingHeader/HEAD/images/image1.jpg -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/en.lproj/InfoPlist.strings: -------------------------------------------------------------------------------- 1 | /* Localized versions of Info.plist keys */ 2 | 3 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | .DS_Store 3 | */build/* 4 | *.pbxuser 5 | !default.pbxuser 6 | *.mode1v3 7 | !default.mode1v3 8 | *.mode2v3 9 | !default.mode2v3 10 | *.perspectivev3 11 | !default.perspectivev3 12 | xcuserdata 13 | profile 14 | *.moved-aside 15 | DerivedData 16 | .idea/ 17 | *.hmap 18 | *.xccheckout 19 | 20 | #CocoaPods 21 | Pods 22 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/IBAppDelegate.h: -------------------------------------------------------------------------------- 1 | // 2 | // IBAppDelegate.h 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface IBAppDelegate : UIResponder 12 | 13 | @property (strong, nonatomic) UIWindow *window; 14 | 15 | @end 16 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/main.m: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | #import "IBAppDelegate.h" 12 | 13 | int main(int argc, char * argv[]) 14 | { 15 | @autoreleasepool { 16 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([IBAppDelegate class])); 17 | } 18 | } 19 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/IBScrollViewFloatingHeader-Prefix.pch: -------------------------------------------------------------------------------- 1 | // 2 | // Prefix header 3 | // 4 | // The contents of this file are implicitly included at the beginning of every source file. 5 | // 6 | 7 | #import 8 | 9 | #ifndef __IPHONE_5_0 10 | #warning "This project uses features only available in iOS SDK 5.0 and later." 11 | #endif 12 | 13 | #ifdef __OBJC__ 14 | #import 15 | #import 16 | #endif 17 | -------------------------------------------------------------------------------- /IBScrollViewFloatingHeader/UIScrollView+IBFloatingHeader.h: -------------------------------------------------------------------------------- 1 | // 2 | // UIScrollView+IBFloatingHeader.h 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface UIScrollView (IBFloatingHeader) 12 | 13 | @property(nonatomic,retain) UIView* floatingHeaderView; 14 | 15 | -(void)removeContentOffsetObserver; 16 | 17 | @end 18 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/IBViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // IBViewController.h 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import 10 | #import "UIScrollView+IBFloatingHeader.h" 11 | @interface IBViewController : UIViewController{ 12 | NSArray* array; 13 | } 14 | 15 | @property (strong, nonatomic) IBOutlet UITableView *tableView; 16 | @end 17 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/IBScrollViewFloatingHeader/UIScrollView+IBFloatingHeader.h: -------------------------------------------------------------------------------- 1 | // 2 | // UIScrollView+IBFloatingHeader.h 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface UIScrollView (IBFloatingHeader) 12 | 13 | @property(nonatomic,retain) UIView* floatingHeaderView; 14 | 15 | -(void)removeContentOffsetObserver; 16 | 17 | @end 18 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/Images.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" : "40x40", 11 | "scale" : "2x" 12 | }, 13 | { 14 | "idiom" : "iphone", 15 | "size" : "60x60", 16 | "scale" : "2x" 17 | }, 18 | { 19 | "idiom" : "ipad", 20 | "size" : "29x29", 21 | "scale" : "1x" 22 | }, 23 | { 24 | "idiom" : "ipad", 25 | "size" : "29x29", 26 | "scale" : "2x" 27 | }, 28 | { 29 | "idiom" : "ipad", 30 | "size" : "40x40", 31 | "scale" : "1x" 32 | }, 33 | { 34 | "idiom" : "ipad", 35 | "size" : "40x40", 36 | "scale" : "2x" 37 | }, 38 | { 39 | "idiom" : "ipad", 40 | "size" : "76x76", 41 | "scale" : "1x" 42 | }, 43 | { 44 | "idiom" : "ipad", 45 | "size" : "76x76", 46 | "scale" : "2x" 47 | } 48 | ], 49 | "info" : { 50 | "version" : 1, 51 | "author" : "xcode" 52 | } 53 | } -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/Images.xcassets/LaunchImage.launchimage/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "orientation" : "portrait", 5 | "idiom" : "iphone", 6 | "extent" : "full-screen", 7 | "minimum-system-version" : "7.0", 8 | "scale" : "2x" 9 | }, 10 | { 11 | "orientation" : "portrait", 12 | "idiom" : "iphone", 13 | "subtype" : "retina4", 14 | "extent" : "full-screen", 15 | "minimum-system-version" : "7.0", 16 | "scale" : "2x" 17 | }, 18 | { 19 | "orientation" : "portrait", 20 | "idiom" : "ipad", 21 | "extent" : "full-screen", 22 | "minimum-system-version" : "7.0", 23 | "scale" : "1x" 24 | }, 25 | { 26 | "orientation" : "landscape", 27 | "idiom" : "ipad", 28 | "extent" : "full-screen", 29 | "minimum-system-version" : "7.0", 30 | "scale" : "1x" 31 | }, 32 | { 33 | "orientation" : "portrait", 34 | "idiom" : "ipad", 35 | "extent" : "full-screen", 36 | "minimum-system-version" : "7.0", 37 | "scale" : "2x" 38 | }, 39 | { 40 | "orientation" : "landscape", 41 | "idiom" : "ipad", 42 | "extent" : "full-screen", 43 | "minimum-system-version" : "7.0", 44 | "scale" : "2x" 45 | } 46 | ], 47 | "info" : { 48 | "version" : 1, 49 | "author" : "xcode" 50 | } 51 | } -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | IBScrollViewFloatingHeader 2 | ========================== 3 | 4 | This project is inspired by Facebook's Floating Header View on iOS. 5 | 6 | The header view will float on the top on two cases: 7 | - ScrollView is scrolled all the way to the top; 8 | - User scrolled up faster than a normal scroll. 9 | 10 | Facebook Example 11 | 12 | This is supposed to work on iOS 5+. 13 | 14 | Supported Views: 15 | 16 | - UIScrollView 17 | - UITableView 18 | - UICollectionView -- ***untested*** 19 | 20 | ## Usage 21 | Add UIScrollView+IBFloatingHeader.h and UIScrollView+IBFloatingHeader.m to your Xcode project. 22 | 23 | Import UIScrollView+IBFloatingHeader.h on your desired UIViewController. 24 | 25 | #import "UIScrollView+IBFloatingHeader.h" 26 | 27 | Create a custom UIView and set it as the floating header for the UIScrollView/UITableView of your choice. 28 | 29 | UIView* header = [[UIView alloc]initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen]bounds].size.width, 40)]; 30 | [header setBackgroundColor:[UIColor redColor]]; 31 | [self.scrollView setFloatingHeaderView:header]; 32 | 33 | In your view controller, add: 34 | `- (void)viewWillDisappear:(BOOL)animated { 35 | [self.tableView removeContentOffsetObserver]; 36 | }` 37 | 38 | Access the floating view by sending the floatingHeaderView message to the UIScrollView/UITableView 39 | 40 | UIView* floatingHeaderView = [self.tableView floatingHeaderView]; 41 | 42 | ### Known Issues 43 | None yet. 44 | 45 | ### Contributions 46 | - Contributions and suggestions are welcome. -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/IBScrollViewFloatingHeader-Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleDisplayName 8 | ${PRODUCT_NAME} 9 | CFBundleExecutable 10 | ${EXECUTABLE_NAME} 11 | CFBundleIdentifier 12 | com.ivan.bruel.${PRODUCT_NAME:rfc1034identifier} 13 | CFBundleInfoDictionaryVersion 14 | 6.0 15 | CFBundleName 16 | ${PRODUCT_NAME} 17 | CFBundlePackageType 18 | APPL 19 | CFBundleShortVersionString 20 | 1.0 21 | CFBundleSignature 22 | ???? 23 | CFBundleVersion 24 | 1.0 25 | LSRequiresIPhoneOS 26 | 27 | UIMainStoryboardFile 28 | Main_iPhone 29 | UIMainStoryboardFile~ipad 30 | Main_iPad 31 | UIRequiredDeviceCapabilities 32 | 33 | armv7 34 | 35 | UISupportedInterfaceOrientations 36 | 37 | UIInterfaceOrientationPortrait 38 | UIInterfaceOrientationLandscapeLeft 39 | UIInterfaceOrientationLandscapeRight 40 | 41 | UISupportedInterfaceOrientations~ipad 42 | 43 | UIInterfaceOrientationPortrait 44 | UIInterfaceOrientationPortraitUpsideDown 45 | UIInterfaceOrientationLandscapeLeft 46 | UIInterfaceOrientationLandscapeRight 47 | 48 | 49 | 50 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/IBViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // IBViewController.m 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import "IBViewController.h" 10 | 11 | @interface IBViewController () 12 | 13 | @end 14 | 15 | @implementation IBViewController 16 | 17 | -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ 18 | return array.count; 19 | } 20 | -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 21 | UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"]; 22 | if(cell == nil){ 23 | cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"]; 24 | } 25 | [cell.textLabel setText:array[indexPath.row]]; 26 | return cell; 27 | } 28 | - (void)viewDidLoad 29 | { 30 | [super viewDidLoad]; 31 | array = [NSArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow",@"Red", @"Green", @"Blue", @"Yellow", nil]; 32 | 33 | UIView* header = [[UIView alloc]initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen]bounds].size.width, 40)]; 34 | [header setBackgroundColor:[UIColor redColor]]; 35 | [self.tableView setFloatingHeaderView:header]; 36 | // Do any additional setup after loading the view, typically from a nib. 37 | } 38 | 39 | - (void)didReceiveMemoryWarning 40 | { 41 | [super didReceiveMemoryWarning]; 42 | // Dispose of any resources that can be recreated. 43 | } 44 | 45 | @end 46 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/IBAppDelegate.m: -------------------------------------------------------------------------------- 1 | // 2 | // IBAppDelegate.m 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import "IBAppDelegate.h" 10 | 11 | @implementation IBAppDelegate 12 | 13 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 14 | { 15 | // Override point for customization after application launch. 16 | return YES; 17 | } 18 | 19 | - (void)applicationWillResignActive:(UIApplication *)application 20 | { 21 | // 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. 22 | // 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. 23 | } 24 | 25 | - (void)applicationDidEnterBackground:(UIApplication *)application 26 | { 27 | // 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. 28 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 29 | } 30 | 31 | - (void)applicationWillEnterForeground:(UIApplication *)application 32 | { 33 | // 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. 34 | } 35 | 36 | - (void)applicationDidBecomeActive:(UIApplication *)application 37 | { 38 | // 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. 39 | } 40 | 41 | - (void)applicationWillTerminate:(UIApplication *)application 42 | { 43 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 44 | } 45 | 46 | @end 47 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/Base.lproj/Main_iPhone.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/Base.lproj/Main_iPad.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | -------------------------------------------------------------------------------- /IBScrollViewFloatingHeader/UIScrollView+IBFloatingHeader.m: -------------------------------------------------------------------------------- 1 | // 2 | // UIScrollView+IBFloatingHeader.m 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import "UIScrollView+IBFloatingHeader.h" 10 | #import 11 | 12 | static void * IBFloatingHeaderViewKey = &IBFloatingHeaderViewKey; 13 | static void * IBFloatingHeaderViewContext = &IBFloatingHeaderViewContext; 14 | 15 | @implementation UIScrollView (IBFloatingHeader) 16 | 17 | #pragma mark - Setters/Getters 18 | -(UIView *)floatingHeaderView{ 19 | return objc_getAssociatedObject(self, IBFloatingHeaderViewKey); 20 | } 21 | 22 | -(void)setFloatingHeaderView:(UIView *)headerView{ 23 | [self _handlePreviousHeaderView]; 24 | 25 | objc_setAssociatedObject(self, IBFloatingHeaderViewKey, headerView, OBJC_ASSOCIATION_RETAIN_NONATOMIC); 26 | 27 | [self _handleNewHeaderView]; 28 | } 29 | #pragma mark - Handle add/remove of views; 30 | -(void)_handlePreviousHeaderView{ 31 | UIView* previousHeaderView = [self floatingHeaderView]; 32 | if(previousHeaderView != nil){ 33 | UIEdgeInsets contentInset = [self contentInset]; 34 | UIEdgeInsets scrollInset = [self scrollIndicatorInsets]; 35 | contentInset.top-=previousHeaderView.frame.size.height; 36 | scrollInset.top-=previousHeaderView.frame.size.height; 37 | [self setContentInset:contentInset]; 38 | [self setScrollIndicatorInsets:scrollInset]; 39 | [previousHeaderView removeFromSuperview]; 40 | @try { 41 | [self removeObserver:self forKeyPath:@"contentOffset"]; 42 | } 43 | @catch (NSException * __unused exception) { 44 | 45 | } 46 | previousHeaderView = nil; 47 | 48 | } 49 | } 50 | -(void)_handleNewHeaderView{ 51 | if(self.floatingHeaderView!=nil){ 52 | [self addSubview:self.floatingHeaderView]; 53 | [self addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew context:IBFloatingHeaderViewContext]; 54 | [self.floatingHeaderView setFrame:CGRectMake(0, -self.floatingHeaderView.frame.size.height, self.frame.size.width, self.floatingHeaderView.frame.size.height)]; 55 | UIEdgeInsets contentInset = [self contentInset]; 56 | UIEdgeInsets scrollInset = [self scrollIndicatorInsets]; 57 | contentInset.top+=self.floatingHeaderView.frame.size.height; 58 | scrollInset.top+=self.floatingHeaderView.frame.size.height; 59 | [self setContentInset:contentInset]; 60 | [self setScrollIndicatorInsets:scrollInset]; 61 | [self setContentOffset:CGPointMake(0, -self.floatingHeaderView.frame.size.height)]; 62 | } 63 | } 64 | 65 | #pragma mark - Scroll Logic 66 | /* 67 | * Three scrollStates: 68 | * - Fast Swipe up + header not visible = start showing the header 69 | * - Header is showing at least part of itself: scroll it by the content offset difference (with a maximum of the top offset) 70 | * - Header is completely showing = header should not scroll any more 71 | */ 72 | -(void)_scrolledFromOffset:(CGFloat)oldYOffset toOffset:(CGFloat)newYOffset{ 73 | CGPoint scrollVelocity = [[self panGestureRecognizer] velocityInView:self]; 74 | BOOL fastSwipe = NO; 75 | if(abs(scrollVelocity.y)>1000){ 76 | fastSwipe = YES; 77 | } 78 | BOOL isHeaderShowing = self.floatingHeaderView.frame.origin.y+self.floatingHeaderView.frame.size.height>=newYOffset; 79 | BOOL isHeaderCompletelyShowing = self.floatingHeaderView.frame.origin.y >= oldYOffset; 80 | 81 | if(fastSwipe && !isHeaderShowing && oldYOffset>newYOffset){ 82 | CGFloat difference = oldYOffset-newYOffset; 83 | CGRect floatingFrame = self.floatingHeaderView.frame; 84 | floatingFrame.origin.y = newYOffset - floatingFrame.size.height + difference; 85 | if(floatingFrame.origin.y>newYOffset) 86 | floatingFrame.origin.y = newYOffset; 87 | [self.floatingHeaderView setFrame:floatingFrame]; 88 | } 89 | if(isHeaderShowing){ 90 | CGFloat difference = oldYOffset-newYOffset; 91 | CGRect floatingFrame = self.floatingHeaderView.frame; 92 | //floatingFrame.origin.y = floatingFrame.origin.y + difference; 93 | if(floatingFrame.origin.y>newYOffset) 94 | floatingFrame.origin.y = newYOffset; 95 | [self.floatingHeaderView setFrame:floatingFrame]; 96 | } 97 | if(isHeaderCompletelyShowing && newYOffset<-self.floatingHeaderView.frame.size.height){ 98 | CGRect floatingFrame = self.floatingHeaderView.frame; 99 | floatingFrame.origin.y = newYOffset; 100 | [self.floatingHeaderView setFrame:floatingFrame]; 101 | 102 | } 103 | } 104 | #pragma mark - KVO 105 | - (void)observeValueForKeyPath:(NSString *)keyPath 106 | ofObject:(id)object 107 | change:(NSDictionary *)change 108 | context:(void *)context{ 109 | if (context == IBFloatingHeaderViewContext) { 110 | if ([keyPath isEqualToString:@"contentOffset"]) { 111 | CGFloat oldYOffset = [[change objectForKey:@"old"]CGPointValue].y; 112 | CGFloat newYOffset = [[change objectForKey:@"new"]CGPointValue].y; 113 | [self _scrolledFromOffset:oldYOffset toOffset:newYOffset]; 114 | } 115 | }else{ 116 | [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; 117 | } 118 | } 119 | 120 | - (void)removeContentOffsetObserver { 121 | [self removeObserver:self forKeyPath:@"contentOffset" context:IBFloatingHeaderViewContext]; 122 | } 123 | 124 | @end 125 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader/IBScrollViewFloatingHeader/UIScrollView+IBFloatingHeader.m: -------------------------------------------------------------------------------- 1 | // 2 | // UIScrollView+IBFloatingHeader.m 3 | // IBScrollViewFloatingHeader 4 | // 5 | // Created by Ivan Bruel on 04/01/14. 6 | // Copyright (c) 2014 Ivan Bruel. All rights reserved. 7 | // 8 | 9 | #import "UIScrollView+IBFloatingHeader.h" 10 | #import 11 | 12 | static void * IBFloatingHeaderViewKey = &IBFloatingHeaderViewKey; 13 | static void * IBFloatingHeaderViewContext = &IBFloatingHeaderViewContext; 14 | 15 | @implementation UIScrollView (IBFloatingHeader) 16 | 17 | #pragma mark - Setters/Getters 18 | -(UIView *)floatingHeaderView{ 19 | return objc_getAssociatedObject(self, IBFloatingHeaderViewKey); 20 | } 21 | 22 | -(void)setFloatingHeaderView:(UIView *)headerView{ 23 | [self _handlePreviousHeaderView]; 24 | 25 | objc_setAssociatedObject(self, IBFloatingHeaderViewKey, headerView, OBJC_ASSOCIATION_RETAIN_NONATOMIC); 26 | 27 | [self _handleNewHeaderView]; 28 | } 29 | #pragma mark - Handle add/remove of views; 30 | -(void)_handlePreviousHeaderView{ 31 | UIView* previousHeaderView = [self floatingHeaderView]; 32 | if(previousHeaderView != nil){ 33 | UIEdgeInsets contentInset = [self contentInset]; 34 | UIEdgeInsets scrollInset = [self scrollIndicatorInsets]; 35 | contentInset.top-=previousHeaderView.frame.size.height; 36 | scrollInset.top-=previousHeaderView.frame.size.height; 37 | [self setContentInset:contentInset]; 38 | [self setScrollIndicatorInsets:scrollInset]; 39 | [previousHeaderView removeFromSuperview]; 40 | @try { 41 | [self removeObserver:self forKeyPath:@"contentOffset"]; 42 | } 43 | @catch (NSException * __unused exception) { 44 | 45 | } 46 | previousHeaderView = nil; 47 | 48 | } 49 | } 50 | -(void)_handleNewHeaderView{ 51 | if(self.floatingHeaderView!=nil){ 52 | [self addSubview:self.floatingHeaderView]; 53 | [self addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew context:IBFloatingHeaderViewContext]; 54 | [self.floatingHeaderView setFrame:CGRectMake(0, -self.floatingHeaderView.frame.size.height, self.frame.size.width, self.floatingHeaderView.frame.size.height)]; 55 | UIEdgeInsets contentInset = [self contentInset]; 56 | UIEdgeInsets scrollInset = [self scrollIndicatorInsets]; 57 | contentInset.top+=self.floatingHeaderView.frame.size.height; 58 | scrollInset.top+=self.floatingHeaderView.frame.size.height; 59 | [self setContentInset:contentInset]; 60 | [self setScrollIndicatorInsets:scrollInset]; 61 | [self setContentOffset:CGPointMake(0, -self.floatingHeaderView.frame.size.height)]; 62 | } 63 | } 64 | 65 | #pragma mark - Scroll Logic 66 | /* 67 | * Three scrollStates: 68 | * - Fast Swipe up + header not visible = start showing the header 69 | * - Header is showing at least part of itself: scroll it by the content offset difference (with a maximum of the top offset) 70 | * - Header is completely showing = header should not scroll any more 71 | */ 72 | -(void)_scrolledFromOffset:(CGFloat)oldYOffset toOffset:(CGFloat)newYOffset{ 73 | CGPoint scrollVelocity = [[self panGestureRecognizer] velocityInView:self]; 74 | BOOL fastSwipe = NO; 75 | if(abs(scrollVelocity.y)>1000){ 76 | fastSwipe = YES; 77 | } 78 | BOOL isHeaderShowing = self.floatingHeaderView.frame.origin.y+self.floatingHeaderView.frame.size.height>=newYOffset; 79 | BOOL isHeaderCompletelyShowing = self.floatingHeaderView.frame.origin.y >= oldYOffset; 80 | 81 | if(fastSwipe && !isHeaderShowing && oldYOffset>newYOffset){ 82 | CGFloat difference = oldYOffset-newYOffset; 83 | CGRect floatingFrame = self.floatingHeaderView.frame; 84 | floatingFrame.origin.y = newYOffset - floatingFrame.size.height + difference; 85 | if(floatingFrame.origin.y>newYOffset) 86 | floatingFrame.origin.y = newYOffset; 87 | [self.floatingHeaderView setFrame:floatingFrame]; 88 | } 89 | if(isHeaderShowing){ 90 | CGFloat difference = oldYOffset-newYOffset; 91 | CGRect floatingFrame = self.floatingHeaderView.frame; 92 | //floatingFrame.origin.y = floatingFrame.origin.y + difference; 93 | if(floatingFrame.origin.y>newYOffset) 94 | floatingFrame.origin.y = newYOffset; 95 | [self.floatingHeaderView setFrame:floatingFrame]; 96 | } 97 | if(isHeaderCompletelyShowing && newYOffset<-self.floatingHeaderView.frame.size.height){ 98 | CGRect floatingFrame = self.floatingHeaderView.frame; 99 | floatingFrame.origin.y = newYOffset; 100 | [self.floatingHeaderView setFrame:floatingFrame]; 101 | 102 | } 103 | } 104 | #pragma mark - KVO 105 | - (void)observeValueForKeyPath:(NSString *)keyPath 106 | ofObject:(id)object 107 | change:(NSDictionary *)change 108 | context:(void *)context{ 109 | if (context == IBFloatingHeaderViewContext) { 110 | if ([keyPath isEqualToString:@"contentOffset"]) { 111 | CGFloat oldYOffset = [[change objectForKey:@"old"]CGPointValue].y; 112 | CGFloat newYOffset = [[change objectForKey:@"new"]CGPointValue].y; 113 | [self _scrolledFromOffset:oldYOffset toOffset:newYOffset]; 114 | } 115 | }else{ 116 | [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; 117 | } 118 | } 119 | 120 | - (void)removeContentOffsetObserver { 121 | [self removeObserver:self forKeyPath:@"contentOffset" context:IBFloatingHeaderViewContext]; 122 | } 123 | 124 | @end 125 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /Example/IBScrollViewFloatingHeader.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 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