ios - 如何知道一个 View 是否触及 Ios 中的其他 View

Question

我想知道我的 View 何时在任何位置相互接触

提前致谢。

Answer 1

您可以为此使用 UIKit Dynamics。在您的 viewController 中添加以下行。

UIDynamicAnimator* animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];

UICollisionBehavior* collision = [[UICollisionBehavior alloc] initWithItems:@[view1]];


[animator addBehavior:collision];

// add a boundary that coincides with the top edge
CGPoint topEdge = CGPointMake(view2.frame.origin.x +
                            view2.frame.size.width, view2.frame.origin.y);

[collision addBoundaryWithIdentifier:@"view2"
                        fromPoint:view2.frame.origin
                          toPoint:topEdge];

现在在您的 View Controller 中添加此委托(delegate) UICollisionBehaviorDelegate并设置 collision.collisionDelegate = self;

您可以通过以下方法获取碰撞通知

- (void)collisionBehavior:(UICollisionBehavior *)behavior beganContactForItem:(id<UIDynamicItem>)item 
        withBoundaryIdentifier:(id<NSCopying>)identifier atPoint:(CGPoint)p {
NSLog(@"Boundary contact occurred - %@", identifier);
}