使用平移手势交换图像 [英] swapping images using pan gesture

问题描述

我在主视图中添加了多个 UIImageView ，每个 UIImageView 都显示在其自己的父<$ c中$ c> UIView 为了裁剪目的，每个 UIImageView 也附加到 PanGestureRecognizer 。

I have multiple UIImageView added into the main view, each UIImageView is displayed in its own parent UIView for cropping purpose, each UIImageView is also attached to a PanGestureRecognizer.

我很好奇如何实现pan gesturerecgonizer并通过拖动一个图像（A）将鼠标悬停在另一个图像上（B）并保持，然后允许图像交换图像A和B将被交换（因此A现在显示在旧B的UIView中）。

I am curious on how to implement both pan gesturerecgonizer and also allow image swap by dragging one image (A) to hover over the other image (B) and hold, then the image A and B will be swapped (so A is now displayed in old B's UIView).

这就像刚刚实施的iPhoto应用程序。

This is something like the iPhoto app just implemented.

任何想法？

推荐答案

• 实现平移手势

  • Implement the pan gesture

    在处理平移手势的方法中，检查
    两个imageview的帧是否通过相交CGRectIntersectsRect 。

    In the method which handles the pan gesture check if the frames of two imageview's intersect by using CGRectIntersectsRect.

    if ([gestureRecognizer state] == UIGestureRecognizerStateEnded)
    {
    if(CGRectIntersectsRect(frame1,frame2))
           // Swap both the imageview's
    }
    

  
  

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