ios UIScrollView 里面的 UIScrollView

UIScrollView inside UIScrollView

提问by Anastasia

I have a UIScrollViewwith another UIScrollViewinside. They both are scrolled horizontally and have pagingEnabled = YES. Assume that I started to scroll inner scroll view and reached the most right bound. And if I proceed scrolling in it, then the outer scrollView begins to move. I need to avoid this. Inner view should jump with rubber-band effect, outer should stay at it's place.

我有一个UIScrollView与另一个UIScrollView里面。它们都水平滚动并具有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，则外部 scrollView 开始移动。我需要避免这种情况。内部视图应具有橡皮筋效果，外部应停留在其位置。

Hope it's clear, but here is a sketch:

希望它很清楚，但这里有一个草图：

I've tried to set outerView.scrollEnabled = NO;like this:

我试过这样设置outerView.scrollEnabled = NO;：

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

, and it works exactly how I need, if to scroll just in innerView. OuterView is not scrolled anymore. But I have to set scrollEnabledback to YES somewhere for the case if I'd want to scroll outerView again. I've tried to do it here:

，并且它完全按照我的需要工作，如果仅在innerView中滚动。OuterView 不再滚动。但是scrollEnabled如果我想再次滚动outerView，我必须在某个地方设置回YES。我试过在这里做：

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

, but than I'm getting the same problem: after reaching the the most right bound of innerView outerView scrolls instead of innerView jumps with rubber-band effect.

，但比我遇到了同样的问题：在到达 innerView 的最右侧边界后，outerView 滚动而不是具有橡皮筋效果的 innerView 跳跃。

Any suggestions how to solve a problem?

任何建议如何解决问题？

采纳答案by Anastasia

UPDATE

更新

This solution works always:

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

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

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

OLD ANSWER: doesn't work always

旧答案：并不总是有效

Here is how I solved the problem:

这是我解决问题的方法：

@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 *)viewprevents passing of these events by responder chain.

据我了解，self.delaysContentTouches = NO;使所有事件立即传递，并- (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view防止响应者链传递这些事件。

回答by Apurv

Modify your methods by below way:

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;
         }
    }
}

回答by Eol

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

我有一个类似的问题。我找到了解决方案，但它仅适用于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

回答by etayluz

This works well for me:

这对我很有效：

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

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
  [NSTimer scheduledTimerWithTimeInterval:0.3
                                     target:[NSBlockOperation blockOperationWithBlock:^{ outerScrollView.scrollEnabled = YES; }]
                                   selector:@selector(main)
                                   userInfo:nil
                                    repeats:NO];
}

Remember to adopt the UIScrollViewDelegate in your class declaration and to set the delegate of the innerScrollView to self (do NOT assign the delegate of the outerScrollView)

记住在你的类声明中采用 UIScrollViewDelegate 并将innerScrollView的委托设置为self（不要分配outerScrollView的委托）