用UIPanGestureRecognizer检测重叠

Question

我在UIButton上使用UIButton。我希望通过以下方式检测其中两种重叠的情况：

if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded ||
   [(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateCancelled ||
   [(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateFailed) {

    CGPoint fingerPoint;

    for(id key in BluetoothDeviceDictionary) {
        UIButton* btn = [BluetoothDeviceDictionary objectForKey:key];
        fingerPoint = [(UIPanGestureRecognizer*)sender locationInView:btn.superview];
    }

    //BLUETOOTH SHARING

    if (CGRectContainsPoint(All buttons from dictionary.frame, fingerPoint)) {

        for the UIButton that has been overlapped do...

基本上正在发生的是，用户将一个UIButton拖到屏幕上的一系列UIButton中的任何其他UIButton上，这些UIButton是dictionary的一部分。当用户在其中任何一个上发布时，程序必须识别其中哪一个重叠，以及来自dictionary的相对dictionary。

我只能为CGRectContainsPoint指定一个按钮，我也不知道如何理解其中的一个按钮，并从dictionary获取key。

Answer 1

试一试如下：

UIPanGestureRecognizer *gesture = (UIPanGestureRecognizer *)sender;

if(gesture.state == UIGestureRecognizerStateEnded ||
   gesture.state == UIGestureRecognizerStateCancelled ||
   gesture.state == UIGestureRecognizerStateFailed) {

CGPoint dropPoint = [gesture locationInView:gesture.view.superview];

for(id key in BluetoothDeviceDictionary) {
    UIButton* btn = [BluetoothDeviceDictionary objectForKey:key];

    if (CGRectContainsPoint(btw.frame, dropPoint)) {
        // overlap - do something...

        // maybe continue or return (if the loop shouldn't continue to test the other buttons
    }
}