如何检测 UICollectionView 上的触摸? [英] How to detect touch on UICollectionView?

问题描述

我想在屏幕上有手指时禁用 UICollectionViewController 的自动旋转，就像 iPhone 照片应用一样.

I want to disable UICollectionViewController's autorotation whenever there's a finger on the screen, as the iPhone photo app does.

怎么做?

• 如果使用点击手势，如何区分不同的触摸状态?(状态应该是touching，即使在手指移动之后.)
• 如果使用touchBegan:withEvent:，代码放在哪里?(点击视图可以是 UICollectionView 的任何子视图.)

• If use tap gesture, how to distinguish different touch states? (The state should be touching, even after finger moving.)
• If use touchBegan:withEvent:, where to put that code? (The hit view can be any subview of UICollectionView.)

推荐答案

我会在 touchesBegan 中设置一个标志并在 touchesEnded 中清除它.然后在您的 shouldAutoRotate 方法中，您可以检查标志并在设置标志时返回 false.

I would set a flag in touchesBegan and clear it in touchesEnded. Then in your shouldAutoRotate method you can check the flag and return false if the flag is set.

像这样:

// In your UICollectionView subclass:

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    // Do stuff
    ...
    canRotate = NO;
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    // Do stuff
    ...
    canRotate = YES;
}

// In your UICollectionViewController:

-(bool)shouldAutorotate
{
    return(canRotate);
}

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