├── .gitignore ├── ECStretchableHeaderView.h ├── ECStretchableHeaderView.m ├── ECStretchableHeaderView.podspec ├── ECStretchableHeaderViewExample ├── ECStretchableHeaderViewExample.xcodeproj │ ├── project.pbxproj │ ├── project.xcworkspace │ │ ├── contents.xcworkspacedata │ │ ├── xcshareddata │ │ │ └── ECStretchableHeaderViewExample.xccheckout │ │ └── xcuserdata │ │ │ └── eric.xcuserdatad │ │ │ └── UserInterfaceState.xcuserstate │ └── xcuserdata │ │ └── eric.xcuserdatad │ │ └── xcschemes │ │ ├── ECStretchableHeaderViewExample.xcscheme │ │ └── xcschememanagement.plist ├── ECStretchableHeaderViewExample.xcworkspace │ ├── contents.xcworkspacedata │ ├── xcshareddata │ │ └── ECStretchableHeaderViewExample.xccheckout │ └── xcuserdata │ │ └── eric.xcuserdatad │ │ └── UserInterfaceState.xcuserstate ├── ECStretchableHeaderViewExample │ ├── AppDelegate.h │ ├── AppDelegate.m │ ├── Base.lproj │ │ ├── LaunchScreen.xib │ │ └── Main.storyboard │ ├── Images.xcassets │ │ └── AppIcon.appiconset │ │ │ └── Contents.json │ ├── Info.plist │ ├── ViewController.h │ ├── ViewController.m │ └── main.m ├── ECStretchableHeaderViewExampleTests │ ├── ECStretchableHeaderViewExampleTests.m │ └── Info.plist └── Podfile ├── LICENSE.md └── README.md /.gitignore: -------------------------------------------------------------------------------- 1 | 2 | ECStretchableHeaderViewExample/Podfile.lock 3 | 4 | ECStretchableHeaderViewExample/Pods 5 | -------------------------------------------------------------------------------- /ECStretchableHeaderView.h: -------------------------------------------------------------------------------- 1 | // 2 | // ECStretchableHeaderView.h 3 | // StretchableHeaderViewExample 4 | // 5 | // Created by Eric Castro on 30/07/14. 6 | // Copyright (c) 2014 cast.ro. All rights reserved. 7 | // 8 | 9 | #import 10 | @protocol ECStretchableHeaderViewDelegate; 11 | 12 | @interface ECStretchableHeaderView : UIView 13 | 14 | @property (assign) CGFloat maxHeight; 15 | @property (assign) CGFloat minHeight; 16 | @property (assign) CGFloat minOffset; 17 | @property (assign) BOOL compensateBottomScrollingArea; 18 | @property (assign) BOOL resizingEnabled; 19 | 20 | @property (strong) NSLayoutConstraint *heightConstraint; 21 | 22 | @property (assign) BOOL tapToExpand; 23 | 24 | @property(nonatomic, strong) UIScrollView *attachedScrollView; 25 | 26 | - (void)attachToScrollView:(UIScrollView *)scrollView inset:(CGFloat)inset; 27 | 28 | - (void)attachToScrollView:(UIScrollView *)scrollView parentView:(UIView *)parentView inset:(CGFloat)inset; 29 | 30 | @end 31 | 32 | @protocol ECStretchableHeaderViewDelegate 33 | 34 | 35 | @end -------------------------------------------------------------------------------- /ECStretchableHeaderView.m: -------------------------------------------------------------------------------- 1 | // 2 | // ECStretchableHeaderView.m 3 | // StretchableHeaderViewExample 4 | // 5 | // Created by Eric Castro on 30/07/14. 6 | // Copyright (c) 2014 cast.ro. All rights reserved. 7 | // 8 | #import 9 | #import 10 | 11 | #import "ECStretchableHeaderView.h" 12 | 13 | @implementation ECStretchableHeaderView 14 | { 15 | UIPanGestureRecognizer *_panGestureRecognizer; 16 | UITapGestureRecognizer *_tapGestureRecognizer; 17 | 18 | CGPoint _lastPanLocation; 19 | 20 | BOOL _touchesStartedOnSelf; 21 | 22 | CGFloat _inset; 23 | 24 | HTDelegateProxy *_delegateProxy; 25 | id _originalScrollViewDelegate; 26 | } 27 | - (instancetype)initWithCoder:(NSCoder *)aDecoder 28 | { 29 | self = [super initWithCoder:aDecoder]; 30 | if (self) { 31 | [self _setupView]; 32 | } 33 | return self; 34 | } 35 | - (instancetype)initWithFrame:(CGRect)frame 36 | { 37 | self = [super initWithFrame:frame]; 38 | if (self) { 39 | [self _setupView]; 40 | } 41 | return self; 42 | } 43 | 44 | - (void)_setupView 45 | { 46 | _panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(didPan:)]; 47 | [self addGestureRecognizer:_panGestureRecognizer]; 48 | _panGestureRecognizer.delegate = self; 49 | 50 | _tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTap:)]; 51 | [self addGestureRecognizer:_tapGestureRecognizer]; 52 | _tapGestureRecognizer.delegate = self; 53 | 54 | self.clipsToBounds = YES; 55 | self.translatesAutoresizingMaskIntoConstraints = NO; 56 | 57 | _minHeight = 0.0; 58 | _maxHeight = CGRectGetHeight(self.frame); 59 | _touchesStartedOnSelf = NO; 60 | _tapToExpand = NO; 61 | _compensateBottomScrollingArea = NO; 62 | _resizingEnabled = YES; 63 | } 64 | 65 | - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer 66 | { 67 | return NO; 68 | } 69 | 70 | - (void)didTap:(id)sender 71 | { 72 | CGPoint newOffset = self.attachedScrollView.contentOffset; 73 | newOffset.y -= self.maxHeight - CGRectGetHeight(self.frame); 74 | [UIView animateWithDuration:0.2f delay:0.0f options:UIViewAnimationOptionCurveEaseOut animations:^{ 75 | [self.attachedScrollView setContentOffset:newOffset animated:YES]; 76 | } completion:nil]; 77 | } 78 | - (void)didPan:(id)sender 79 | { 80 | CGPoint currentLocation = [_panGestureRecognizer locationInView:self]; 81 | 82 | if (_panGestureRecognizer.state == UIGestureRecognizerStateBegan) 83 | { 84 | _lastPanLocation = currentLocation; 85 | [self.attachedScrollView pop_removeAllAnimations]; 86 | [self.attachedScrollView setContentOffset:self.attachedScrollView.contentOffset animated:NO]; 87 | } 88 | 89 | if (_panGestureRecognizer.state == UIGestureRecognizerStateChanged) 90 | { 91 | CGFloat heightDiff = currentLocation.y - _lastPanLocation.y; 92 | 93 | if (self.attachedScrollView.contentOffset.y <= -self.attachedScrollView.contentInset.top) 94 | { 95 | heightDiff = heightDiff/3; 96 | } 97 | self.attachedScrollView.contentOffset = CGPointMake(self.attachedScrollView.contentOffset.x, self.attachedScrollView.contentOffset.y - heightDiff); 98 | } 99 | 100 | if ( 101 | _panGestureRecognizer.state == UIGestureRecognizerStateEnded || 102 | _panGestureRecognizer.state == UIGestureRecognizerStateCancelled|| 103 | _panGestureRecognizer.state == UIGestureRecognizerStateFailed) 104 | { 105 | if (self.attachedScrollView.contentOffset.y <= -self.attachedScrollView.contentInset.top) 106 | { 107 | _touchesStartedOnSelf = YES; 108 | [self _performBounceBackToTopAnimation]; 109 | } 110 | else 111 | { 112 | _touchesStartedOnSelf = YES; 113 | CGPoint velocity = [_panGestureRecognizer velocityInView:self]; 114 | 115 | if (self.attachedScrollView.bounds.size.width >= self.attachedScrollView.contentSize.width) velocity.x = 0; 116 | //if (self.attachedScrollView.bounds.size.height >= self.attachedScrollView.contentSize.height) velocity.y = 0; 117 | 118 | velocity.x = -velocity.x; 119 | velocity.y = -velocity.y; 120 | 121 | [self _performDecelerateAnimationWithVelocity:velocity completionBlock:^{ 122 | _touchesStartedOnSelf = NO; 123 | }]; 124 | } 125 | } 126 | 127 | _lastPanLocation = currentLocation; 128 | } 129 | 130 | - (void)_performDecelerateAnimationWithVelocity:(CGPoint)velocity completionBlock:(void (^)())completionBlock 131 | { 132 | POPDecayAnimation *decayAnimation = [POPDecayAnimation animation]; 133 | 134 | POPAnimatableProperty *prop = [POPAnimatableProperty propertyWithName:@"com.rounak.boundsY" initializer:^(POPMutableAnimatableProperty *prop) { 135 | // read value, feed data to Pop 136 | prop.readBlock = ^(id obj, CGFloat values[]) { 137 | values[0] = [obj bounds].origin.x; 138 | values[1] = [obj bounds].origin.y; 139 | }; 140 | // write value, get data from Pop, and apply it to the view 141 | prop.writeBlock = ^(id obj, const CGFloat values[]) { 142 | 143 | CGRect tempBounds = [obj bounds]; 144 | tempBounds.origin.x = values[0]; 145 | CGFloat topBoundCheck = values[1] + CGRectGetHeight(self.frame) + _inset; 146 | CGFloat velocityThreshold = ((NSValue *)decayAnimation.velocity).CGPointValue.y / 10.0f * 0.2f; 147 | 148 | if (velocityThreshold < 0 && topBoundCheck < velocityThreshold && values[1] < self.maxHeight) 149 | { 150 | [self.attachedScrollView pop_removeAllAnimations]; 151 | _touchesStartedOnSelf = YES; 152 | tempBounds.origin.y = - CGRectGetHeight(self.frame) - _inset + topBoundCheck; 153 | dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t) (0.001 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ 154 | [self _performBounceBackToTopAnimation]; 155 | }); 156 | } 157 | else if (tempBounds.origin.y > _attachedScrollView.contentSize.height - _attachedScrollView.frame.size.height + _attachedScrollView.contentInset.bottom + velocityThreshold) 158 | { 159 | [self.attachedScrollView pop_removeAllAnimations]; 160 | _touchesStartedOnSelf = YES; 161 | dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t) (0.001 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ 162 | [self _performBounceBackToBottomAnimation]; 163 | }); 164 | } 165 | else 166 | tempBounds.origin.y = values[1]; 167 | 168 | [self _scrollView:_attachedScrollView offsetChanged:@{@"new":[NSValue valueWithCGSize:CGSizeMake(0.0f, values[1])], @"old":[NSValue valueWithCGSize:CGSizeMake(0.0f, values[1])]}]; 169 | [obj setBounds:tempBounds]; 170 | }; 171 | // dynamics threshold 172 | prop.threshold = 0.01; 173 | 174 | }]; 175 | 176 | decayAnimation.property = prop; 177 | decayAnimation.velocity = [NSValue valueWithCGPoint:velocity]; 178 | decayAnimation.completionBlock = ^(POPAnimation *anim, BOOL finished) { if (completionBlock) completionBlock(); }; 179 | [self.attachedScrollView pop_addAnimation:decayAnimation forKey:@"decelerate"]; 180 | } 181 | - (POPBasicAnimation *)_bounceBackAnimation 182 | { 183 | POPBasicAnimation *basicAnimation = [POPBasicAnimation animation]; 184 | POPAnimatableProperty *prop = [POPAnimatableProperty propertyWithName:@"com.rounak.boundsY" initializer:^(POPMutableAnimatableProperty *prop) { 185 | prop.readBlock = ^(id obj, CGFloat values[]) { 186 | values[0] = [obj bounds].origin.x; 187 | values[1] = [obj bounds].origin.y; 188 | }; 189 | prop.writeBlock = ^(id obj, const CGFloat values[]) { 190 | CGRect tempBounds = [obj bounds]; 191 | tempBounds.origin.x = values[0]; 192 | tempBounds.origin.y = values[1]; 193 | [obj setBounds:tempBounds]; 194 | }; 195 | // dynamics threshold 196 | prop.threshold = 0.01; 197 | }]; 198 | basicAnimation.property = prop; 199 | basicAnimation.duration = 0.3f; 200 | basicAnimation.completionBlock = ^(POPAnimation *anim, BOOL finished) { 201 | _touchesStartedOnSelf = NO; 202 | }; 203 | return basicAnimation; 204 | 205 | } 206 | - (void)_performBounceBackToTopAnimation 207 | { 208 | POPBasicAnimation *basicAnimation = [self _bounceBackAnimation]; 209 | basicAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.attachedScrollView.contentOffset.x, - CGRectGetHeight(self.frame) - _inset)]; 210 | [self.attachedScrollView pop_addAnimation:basicAnimation forKey:@"bounceBack"]; 211 | } 212 | 213 | - (void)_performBounceBackToBottomAnimation 214 | { 215 | POPBasicAnimation *basicAnimation = [self _bounceBackAnimation]; 216 | 217 | if (self.attachedScrollView.contentSize.height < self.attachedScrollView.frame.size.height) //fixes weird jump bug 218 | { 219 | basicAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.attachedScrollView.contentOffset.x, 0.0f)]; 220 | } 221 | else 222 | { 223 | basicAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.attachedScrollView.contentOffset.x,self.attachedScrollView.contentSize.height - self.attachedScrollView.bounds.size.height)]; 224 | } 225 | 226 | [self.attachedScrollView pop_addAnimation:basicAnimation forKey:@"bounceBack"]; 227 | } 228 | - (BOOL)changeHeightBy:(CGFloat)heightDiff 229 | { 230 | CGRect frame = self.frame; 231 | 232 | if (frame.size.height + heightDiff > self.maxHeight) 233 | frame.size.height = self.maxHeight; 234 | 235 | else if (frame.size.height + heightDiff < self.minHeight) 236 | frame.size.height = self.minHeight; 237 | 238 | else 239 | frame.size.height += heightDiff; 240 | 241 | if (self.heightConstraint) 242 | { 243 | self.heightConstraint.constant = frame.size.height; 244 | } 245 | else 246 | { 247 | self.frame = frame; 248 | } 249 | 250 | 251 | return YES; 252 | } 253 | 254 | - (void)attachToScrollView:(UIScrollView *)scrollView inset:(CGFloat)inset 255 | { 256 | [self attachToScrollView:scrollView parentView:scrollView.superview inset:inset]; 257 | } 258 | - (void)attachToScrollView:(UIScrollView *)scrollView parentView:(UIView *)parentView inset:(CGFloat)inset 259 | { 260 | _inset = inset; 261 | 262 | CGRect frame = self.frame; 263 | frame.origin.x = parentView.frame.origin.x; 264 | frame.origin.y = parentView.frame.origin.y + inset; 265 | frame.size.width = CGRectGetWidth(parentView.frame); 266 | self.frame = frame; 267 | 268 | [parentView addSubview:self]; 269 | 270 | self.attachedScrollView = scrollView; 271 | 272 | } 273 | 274 | - (void)setAttachedScrollView:(UIScrollView *)attachedScrollView 275 | { 276 | if (_attachedScrollView) 277 | { 278 | _attachedScrollView.delegate = _originalScrollViewDelegate==[NSNull null] ? nil : _originalScrollViewDelegate; 279 | [_attachedScrollView removeObserver:self forKeyPath:@"contentOffset"]; 280 | } 281 | _attachedScrollView = attachedScrollView; 282 | _originalScrollViewDelegate = _attachedScrollView.delegate ? _attachedScrollView.delegate : [NSNull null]; 283 | _delegateProxy = [[HTDelegateProxy alloc] initWithDelegates:@[_originalScrollViewDelegate, self]]; 284 | 285 | _attachedScrollView.delegate = (id)_delegateProxy; 286 | 287 | UIEdgeInsets contentInset = attachedScrollView.contentInset; 288 | contentInset.top = self.maxHeight; 289 | attachedScrollView.contentInset = contentInset; 290 | attachedScrollView.scrollIndicatorInsets = contentInset; 291 | attachedScrollView.contentOffset = CGPointMake(attachedScrollView.contentOffset.x, -CGRectGetHeight(self.frame)); 292 | [attachedScrollView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew context:NULL]; 293 | [attachedScrollView addObserver:self forKeyPath:@"contentSize" options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew context:NULL]; 294 | [self _scrollView:attachedScrollView sizeChanged:@{@"new":[NSValue valueWithCGSize:attachedScrollView.contentSize]}]; 295 | 296 | _minOffset = 0.0f; 297 | } 298 | 299 | - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context 300 | { 301 | UIScrollView *scrollView = object; 302 | 303 | if ([keyPath isEqualToString:@"contentOffset"]) 304 | { 305 | [self _scrollView:scrollView offsetChanged:change]; 306 | } 307 | 308 | if ([keyPath isEqualToString:@"contentSize"]) 309 | { 310 | [self _scrollView:scrollView sizeChanged:change]; 311 | } 312 | } 313 | 314 | - (void)_scrollView:(UIScrollView *)scrollView offsetChanged:(NSDictionary *)change 315 | { 316 | if (!self.resizingEnabled) return; 317 | 318 | NSValue *oldValue = [change valueForKey:@"old"]; 319 | NSValue *newValue = [change valueForKey:@"new"]; 320 | 321 | CGFloat oldYOffset = oldValue.CGPointValue.y; 322 | CGFloat newYOffset = newValue.CGPointValue.y; 323 | CGFloat offsetDiff = oldYOffset-newYOffset; 324 | 325 | CGRect frame = self.frame; 326 | frame.origin.y = newYOffset + _inset; 327 | //self.frame = frame; 328 | 329 | if (newYOffset > scrollView.contentSize.height - scrollView.frame.size.height + scrollView.contentInset.bottom) 330 | { 331 | //bouncing at the bottom; do nothing 332 | } 333 | 334 | CGFloat relativePosition = newYOffset + self.maxHeight - self.minOffset; 335 | CGFloat heightCheck = self.maxHeight - relativePosition; 336 | 337 | if (relativePosition >= 0.0f) 338 | { 339 | if (heightCheck < self.minHeight) 340 | self.heightConstraint.constant = self.minHeight; 341 | else 342 | self.heightConstraint.constant = self.maxHeight - relativePosition; 343 | } 344 | else 345 | self.heightConstraint.constant = self.maxHeight; 346 | 347 | 348 | } 349 | 350 | - (void)_scrollView:(UIScrollView *)scrollView sizeChanged:(NSDictionary *)change 351 | { 352 | if (!self.resizingEnabled) return; 353 | 354 | NSValue *newValue = [change valueForKey:@"new"]; 355 | 356 | UIEdgeInsets contentInset = scrollView.contentInset; 357 | 358 | if (scrollView.contentSize.height < scrollView.frame.size.height) 359 | { 360 | contentInset.bottom = (scrollView.frame.size.height - newValue.CGSizeValue.height) ; 361 | } 362 | else 363 | { 364 | contentInset.bottom = (_compensateBottomScrollingArea ? self.maxHeight : 0.0f); 365 | } 366 | 367 | scrollView.contentInset = contentInset; 368 | 369 | } 370 | 371 | - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView 372 | { 373 | [self.attachedScrollView pop_removeAllAnimations]; 374 | } 375 | - (void)dealloc 376 | { 377 | [self.attachedScrollView removeObserver:self forKeyPath:@"contentSize"]; 378 | [self.attachedScrollView removeObserver:self forKeyPath:@"contentOffset"]; 379 | } 380 | 381 | @end 382 | -------------------------------------------------------------------------------- /ECStretchableHeaderView.podspec: -------------------------------------------------------------------------------- 1 | 2 | Pod::Spec.new do |s| 3 | 4 | s.name = "ECStretchableHeaderView" 5 | s.version = "1.0.3" 6 | s.summary = "A header view that attaches on top of a UIScrollView and reacts to scrolling gestures to expand or contract itself." 7 | s.homepage = "https://github.com/ericcastro/ECStretchableHeaderView" 8 | s.license = { :type => "MIT", :file => "LICENSE.md" } 9 | s.author = { "Eric Castro" => "eric@cast.ro" } 10 | s.social_media_url = "http://twitter.com/_eric_castro" 11 | s.platform = :ios 12 | s.source = { :git => "https://github.com/ericcastro/ECStretchableHeaderView.git", :tag => "v#{s.version}" } 13 | 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/ECStretchableHeaderViewExample/ECStretchableHeaderViewExample.xcworkspace/xcuserdata/eric.xcuserdatad/UserInterfaceState.xcuserstate: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ericcastro/ECStretchableHeaderView/86e3a293c5c6f58861d962088a9138d5a6ca3d0f/ECStretchableHeaderViewExample/ECStretchableHeaderViewExample.xcworkspace/xcuserdata/eric.xcuserdatad/UserInterfaceState.xcuserstate -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/AppDelegate.h: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.h 3 | // ECStretchableHeaderViewExample 4 | // 5 | // Created by Eric Castro on 14/03/15. 6 | // Copyright (c) 2015 Eric Castro. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface AppDelegate : UIResponder 12 | 13 | @property (strong, nonatomic) UIWindow *window; 14 | 15 | 16 | @end 17 | 18 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/AppDelegate.m: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.m 3 | // ECStretchableHeaderViewExample 4 | // 5 | // Created by Eric Castro on 14/03/15. 6 | // Copyright (c) 2015 Eric Castro. 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 | - (void)applicationWillResignActive:(UIApplication *)application { 24 | // 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. 25 | // 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. 26 | } 27 | 28 | - (void)applicationDidEnterBackground:(UIApplication *)application { 29 | // 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. 30 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 31 | } 32 | 33 | - (void)applicationWillEnterForeground:(UIApplication *)application { 34 | // 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. 35 | } 36 | 37 | - (void)applicationDidBecomeActive:(UIApplication *)application { 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 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 43 | } 44 | 45 | @end 46 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/Base.lproj/LaunchScreen.xib: -------------------------------------------------------------------------------- 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 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/Base.lproj/Main.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 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/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" : "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 | "idiom" : "ipad", 35 | "size" : "29x29", 36 | "scale" : "1x" 37 | }, 38 | { 39 | "idiom" : "ipad", 40 | "size" : "29x29", 41 | "scale" : "2x" 42 | }, 43 | { 44 | "idiom" : "ipad", 45 | "size" : "40x40", 46 | "scale" : "1x" 47 | }, 48 | { 49 | "idiom" : "ipad", 50 | "size" : "40x40", 51 | "scale" : "2x" 52 | }, 53 | { 54 | "idiom" : "ipad", 55 | "size" : "76x76", 56 | "scale" : "1x" 57 | }, 58 | { 59 | "idiom" : "ipad", 60 | "size" : "76x76", 61 | "scale" : "2x" 62 | } 63 | ], 64 | "info" : { 65 | "version" : 1, 66 | "author" : "xcode" 67 | } 68 | } -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | ro.cast.eric.$(PRODUCT_NAME:rfc1034identifier) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UIRequiredDeviceCapabilities 30 | 31 | armv7 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | UIInterfaceOrientationLandscapeLeft 37 | UIInterfaceOrientationLandscapeRight 38 | 39 | UISupportedInterfaceOrientations~ipad 40 | 41 | UIInterfaceOrientationPortrait 42 | UIInterfaceOrientationPortraitUpsideDown 43 | UIInterfaceOrientationLandscapeLeft 44 | UIInterfaceOrientationLandscapeRight 45 | 46 | 47 | 48 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/ViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.h 3 | // ECStretchableHeaderViewExample 4 | // 5 | // Created by Eric Castro on 14/03/15. 6 | // Copyright (c) 2015 Eric Castro. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface ViewController : UIViewController 12 | @end 13 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/ViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.m 3 | // ECStretchableHeaderViewExample 4 | // 5 | // Created by Eric Castro on 14/03/15. 6 | // Copyright (c) 2015 Eric Castro. All rights reserved. 7 | // 8 | 9 | #import "ViewController.h" 10 | #import "ECStretchableHeaderView.h" 11 | 12 | @interface ViewController () 13 | 14 | @property (weak, nonatomic) IBOutlet ECStretchableHeaderView *headerView; 15 | @property (weak, nonatomic) IBOutlet UITableView *tableView; 16 | @property (weak, nonatomic) IBOutlet NSLayoutConstraint *headerViewHeightConstraint; 17 | 18 | 19 | @end 20 | 21 | @implementation ViewController 22 | 23 | - (void)viewDidLoad { 24 | [super viewDidLoad]; 25 | self.headerView.maxHeight = 320; 26 | self.headerView.minHeight = 100; 27 | self.headerView.layer.borderColor = [UIColor redColor].CGColor; 28 | self.headerView.layer.borderWidth = 3.0f; 29 | self.headerView.heightConstraint = self.headerViewHeightConstraint; 30 | [self.headerView attachToScrollView:self.tableView inset:100.0f]; 31 | } 32 | 33 | - (void)didReceiveMemoryWarning { 34 | [super didReceiveMemoryWarning]; 35 | // Dispose of any resources that can be recreated. 36 | } 37 | 38 | /* 39 | #pragma mark - Navigation 40 | 41 | // In a storyboard-based application, you will often want to do a little preparation before navigation 42 | - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 43 | // Get the new view controller using [segue destinationViewController]. 44 | // Pass the selected object to the new view controller. 45 | } 46 | */ 47 | 48 | #pragma mark UITableViewDataSource - 49 | 50 | - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 51 | { 52 | return 200; 53 | } 54 | 55 | // Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier: 56 | // Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls) 57 | 58 | - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 59 | { 60 | UITableViewCell *c = [tableView dequeueReusableCellWithIdentifier:@"CellIdentifier"]; 61 | c.textLabel.text = [NSString stringWithFormat:@"Item %ld", indexPath.row]; 62 | return c; 63 | } 64 | 65 | 66 | @end 67 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExample/main.m: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // ECStretchableHeaderViewExample 4 | // 5 | // Created by Eric Castro on 14/03/15. 6 | // Copyright (c) 2015 Eric Castro. All rights reserved. 7 | // 8 | 9 | #import 10 | #import "AppDelegate.h" 11 | 12 | int main(int argc, char * argv[]) { 13 | @autoreleasepool { 14 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExampleTests/ECStretchableHeaderViewExampleTests.m: -------------------------------------------------------------------------------- 1 | // 2 | // ECStretchableHeaderViewExampleTests.m 3 | // ECStretchableHeaderViewExampleTests 4 | // 5 | // Created by Eric Castro on 14/03/15. 6 | // Copyright (c) 2015 Eric Castro. All rights reserved. 7 | // 8 | 9 | #import 10 | #import 11 | 12 | @interface ECStretchableHeaderViewExampleTests : XCTestCase 13 | 14 | @end 15 | 16 | @implementation ECStretchableHeaderViewExampleTests 17 | 18 | - (void)setUp { 19 | [super setUp]; 20 | // Put setup code here. This method is called before the invocation of each test method in the class. 21 | } 22 | 23 | - (void)tearDown { 24 | // Put teardown code here. This method is called after the invocation of each test method in the class. 25 | [super tearDown]; 26 | } 27 | 28 | - (void)testExample { 29 | // This is an example of a functional test case. 30 | XCTAssert(YES, @"Pass"); 31 | } 32 | 33 | - (void)testPerformanceExample { 34 | // This is an example of a performance test case. 35 | [self measureBlock:^{ 36 | // Put the code you want to measure the time of here. 37 | }]; 38 | } 39 | 40 | @end 41 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/ECStretchableHeaderViewExampleTests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | ro.cast.eric.$(PRODUCT_NAME:rfc1034identifier) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | BNDL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | 24 | 25 | -------------------------------------------------------------------------------- /ECStretchableHeaderViewExample/Podfile: -------------------------------------------------------------------------------- 1 | use_frameworks! 2 | pod 'ECStretchableHeaderView' 3 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2014 Eric Castro 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 13 | all 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 21 | THE SOFTWARE. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ECStretchableHeaderView 2 | ======================= 3 | 4 | A multi-purpose header view that you can attach to a UITableView (or any UIScrollView), allowing you to maximize the scrolling content's screen real state by expanding and contracting the top header upon scrolling down or up, or by delegating the decision on when to do this through a another object. 5 | 6 | Useful when such header isn't fully needed, but might have some buttons or some other interactive control that needs to remain visible. 7 | 8 | ![ECStretchableHeaderView](http://i.imgur.com/RCqO0O9.gif) 9 | 10 | ## Usage 11 | 12 | ```objc 13 | ECStretchableHeaderView *headerView; 14 | 15 | headerView = [[ECStretchableHeaderView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, CGRectGetWidth(self.tableView.frame), maxHeight)]; 16 | 17 | // the header will expand up to 320 pixels tall when scrolling down 18 | headerView.maxHeight = 320.0f; 19 | 20 | // the header will shrink down to 100 pixels tall when scrolling up 21 | headerView.minHeight = 100.0f; 22 | 23 | // for demo purposes we programmatically create 24 | // a height constraint for the header view 25 | // but more likely you will create it on Interface Builder 26 | // and assign it to a private IBOutlet property 27 | 28 | NSLayoutConstraint *heightConstraint = [NSLayoutConstraint 29 | constraintWithItem:headerView 30 | attribute:NSLayoutAttributeHeight 31 | relatedBy:NSLayoutRelationEqual 32 | toItem:nil 33 | attribute:NSLayoutAttributeNotAnAttribute 34 | multiplier:1.0 35 | constant:headerView.maxHeight]]; 36 | 37 | [headerView addConstraint:heightConstraint]; 38 | 39 | headerView.heightConstraint = heightConstraint; 40 | 41 | // put it at the top of your table vew 42 | [headerView attachToScrollView:self.tableView inset:0.0f]; 43 | ``` 44 | 45 | ## Why do you need to set a height constraint? 46 | 47 | Because **ECStretchableHeaderView** is made to be auto-layout friendly, in a way that you can design your header view on your Storyboard, and not let it get your interface builder be full of layout errors and warnings for missing constraints. 48 | 49 | The height of the header view varies by modifying this constraint constant, as opposed to changing the view's frame. 50 | 51 | The example project contains a **ECStretchableHeaderView** that is not created programatically, but instead created in Interface Builder. 52 | 53 | ## License 54 | 55 | This project is MIT licensed. Feel free to contribute :-) --------------------------------------------------------------------------------