还有其他方法可以在拖动其他视图时检测视图吗？

Question

我使用平移手势在拖动线中拖动多个视图,类似于:iOS - 拖放碰撞检测如何检测所选项目何时拖动到另一个子视图？

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;
        }
    }

}

我有这么多的子视图所以我不想在self.view中循环所有子视图,我只是想在拖动行中检测匹配视图.怎么做？

如果我使用[gestureRecognizer视图],我只会获得第一个视图.

提前感谢您的帮助!

Answer 1

如果您只想要更简单的代码,可以使用UIView的hitTest:withEvent:方法在触摸位置查找视图:

- (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;
}

这假设子视图本身没有(交互式)子视图.