UIView touchesbegan在动画期间不响应 [英] UIView touchesbegan doesn't respond during animation

问题描述

我有一个可拖动类，它继承了UIImageView.当视图没有动画时，拖动效果很好.但是在设置动画时，它不会响应触摸.动画制作完成后，触摸将再次起作用.但是我需要它在触摸时暂停动画并在触摸结束时恢复播放. 我花了一整天的时间进行研究，但找不到原因.

I have a draggable class that inherits UIImageView. The drag works fine when the view is not animating. But when animating it won't respond to touches. Once the animation is completed the touch works again. But I need it to pause the animation on touches and resume when touch ends. I spent the whole day researching it but couldn't figure out the reason.

这是我的动画代码.

[UIView animateWithDuration:5.0f 
  delay:0 
  options:(UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction) 
  animations:^{ 
  self.center = CGPointMake(160,240);
  self.transform = CGAffineTransformIdentity;
  }
  completion:nil
];

- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
    NSLog(@"touch");
    CGPoint pt = [[touches anyObject] locationInView:self];
    startLocation = pt;
    [self.layer removeAllAnimations];
    [[self superview] bringSubviewToFront:self];
}

推荐答案

这是因为ios在动画开始时将动画视图放置到目标位置，但将其绘制在路径上.因此，如果您在移动时点击视图，则实际上是在其框架之外的某个位置点击.

That's because ios places your animating view to the target position, when the animation starts, but draws it on the path. So if you tap the view while moving, you actually tap somewhere out of its frame.

在动画视图的init中，将userInteractionEnabled设置为NO.因此，触摸事件由超级视图处理.

In your animating view's init, set userInteractionEnabled to NO. So the touch events are handled by the superview.

self.userInteractionEnabled = NO;

在超级视图的touchesBegan方法中，检查动画视图的presentationLayer位置.如果它们与触摸位置匹配，则将touchesBegan消息重定向到该视图.

In your superview's touchesBegan method, check your animating view's presentationLayer position. If they match with the touch position, redirect the touchesBegan message to that view.

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    CGPoint point = [[touches anyObject] locationInView:self.view];
    CGPoint presentationPosition = [[animatingView.layer presentationLayer] position];

    if (point.x > presentationPosition.x - 10 && point.x < presentationPosition.x + 10
        && point.y > presentationPosition.y - 10 && point.y < presentationPosition.y + 10) {
        [animatingView touchesBegan:touches withEvent:event];
    }
}

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