UIScrollView内部的UIScrollView

Question

我有一个里面有另一个UIScrollView的UIScrollView。它们都是水平滚动的，并且都有pagingEnabled = YES。假设我开始滚动内部滚动视图，并到达最右边的边界。如果我继续在其中滚动，那么外部的scrollView开始移动。我需要避免这种情况。内景要跳跃，要有橡皮筋效果，外景要留在原处。

希望它是清楚的，但这里有一个草图：

​

我尝试这样设置outerView.scrollEnabled = NO;：

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    outerView.scrollEnabled = NO;
}

，如果只在innerView中滚动，它的工作方式完全符合我的需要。OuterView不再滚动。但是如果我想再次滚动outerView，我必须在某个地方将scrollEnabled设置回YES。我试着在这里这样做：

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    outerView.scrollEnabled = YES;
}

，但是我得到了同样的问题:在到达innerView的最右边界后，outerView滚动而不是使用橡皮筋效果的innerView跳转。

有什么建议如何解决问题吗？

Answer 1

更新

此解决方案始终有效：

@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

-----------------------------------------------------------------------

老答案:并不总是有效

下面是我是如何解决这个问题的：

@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;
}

据我所知，self.delaysContentTouches = NO;使所有事件都能立即交付，而- (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view通过响应器链阻止这些事件的传递。

Answer 2

通过以下方式修改您的方法：

- (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;
         }
    }
}

Answer 3

我也有类似的问题。我找到了解决方案，但它只适用于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