UIScrollView inside UIScrollView

UPDATE

This solution works always:

@implementation InnerScrollViewController <UIScrollViewDelegate, UIGestureRecognizerDelegate>- (void)viewDidLoad{    UISwipeGestureRecognizer*   swipeGesture = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)] autorelease];    swipeGesture.delegate = self;    [self.view addGestureRecognizer:swipeGesture];}- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{    _outerScrollView.scrollEnabled = NO;    return YES;}- (void)handleSwipe:(UIGestureRecognizer*)gestureRecognizer{}- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{       _outerScrollView.scrollEnabled = NO;}- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{    if (!decelerate)    {        _outerScrollView.scrollEnabled = YES;    }}- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    _outerScrollView.scrollEnabled = YES;}@end

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OLD ANSWER: doesn't work always

Here is how I solved the problem:

@implementation InnerView- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        self.delaysContentTouches = NO;    }    return self;}- (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view{    return NO;}

As I understand, self.delaysContentTouches = NO; makes all events to be delivered immediately, and - (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view prevents passing of these events by responder chain.

Modify your methods by below way:

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    if(scrollView == innerView)        outerView.scrollEnabled = NO;    else        outerView.scrollEnabled = YES;}- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{    if(scrollView == innerView)    {         if(innerView.contentOffset.x + innerView.frame.size.width == innerView.contentSize.width)         {              outerView.scrollEnabled = NO;         }         else         {              outerView.scrollEnabled = YES;         }    }}

I have a similar issue. I found the solution, but it works only with innerScrollView.bounces = NO.

@interface PageCtrl ()    @property (weak, nonatomic) IBOutlet UIScrollView *innerScrollView;    @property(nonatomic) UIPanGestureRecognizer *panLockScroll;@end@implementation PageCtrl- (void)viewDidLoad {    // ...    self.innerScrollView.delegate = self;       self.innerScrollView.bounces = NO;   // disable bounces!    self.panLockScroll = [[UIPanGestureRecognizer alloc]initWithTarget:self action:nil];    self.panLockScroll.delegate = self;    [self.innerScrollView addGestureRecognizer:self.panLockScroll];}- (BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer*)otherGestureRecognizer{    if( gestureRecognizer == self.panLockScroll &&         otherGestureRecognizer == self.innerScrollView.panGestureRecognizer ){        return YES;    }    return NO;}@end