ios - 将其他 View 拖到 View 上时，还有另一种检测 View 的方法吗？

Question

我使用平移手势在拖动线中拖动多 View ，类似这样的:iOS - Drag and drop collision detection How to detect when your selected item drags over another subview?

我的代码:

- (void)viewDidLoad
{
    [super viewDidLoad];
    for (UIView *aView in self.view.subviews) {
        [self addGestureRecognizersToPiece:aView];
    }
}

- (void)addGestureRecognizersToPiece:(UIView *)piece
{
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panPiece:)];
    [piece addGestureRecognizer:panGesture];
}



- (void)panPiece:(UIPanGestureRecognizer *)gestureRecognizer
{
    CGPoint dragingPoint = [gestureRecognizer locationInView:self.view];

    for (UIView *aView in self.view.subviews) {
        if (CGRectContainsPoint([aView frame], dragingPoint)) {
                aView.center = dragingPoint;
        }
    }

}

我有很多 subview ，所以我不想在 self.view 中循环所有 subview ，我只想检测拖线中的匹配 View 。怎么做？

如果我使用 [gestureRecognizer View ]，我只会得到第一个 View 。

提前感谢您的帮助!

Answer 1

如果您只想要更简单的代码，您可以使用 UIView 的 hitTest:withEvent: 方法在触摸位置找到 View :

- (void)panPiece:(UIPanGestureRecognizer *)gestureRecognizer
{
    CGPoint draggingPoint = [gestureRecognizer locationInView:self.view];
    UIView *hitView = [self.view hitTest:draggingPoint withEvent:nil];
    if (hitView.superview == self.view)
        hitView.center = draggingPoint;
}

这假设 subview 本身没有(交互式) subview 。