查找使用UITapGestureRecognizer时点击了哪个子视图

Question

使用UIGestureRecognizers时,如何知道事件发生在哪个子视图上？

根据文件:

手势识别器根据对特定视图和所有视图的子视图进行经过测试的触摸进行操作.

据我所知,'view'属性是

手势识别器附加到的视图.

这将是父视图.

Answer 1

这将在事件的位置找到最里面的后代视图.(请注意,如果该子视图具有任何交互式内部私有孙子,则此代码也会找到它们.)

UIView* view = gestureRecognizer.view;
CGPoint loc = [gestureRecognizer locationInView:view];
UIView* subview = [view hitTest:loc withEvent:nil];

在Swift 2中:

let view = gestureRecognizer.view
let loc = gestureRecognizer.locationInView(view)
let subview = view?.hitTest(loc, withEvent: nil) // note: it is a `UIView?`

在Swift 3中:

let view = gestureRecognizer.view
let loc = gestureRecognizer.location(in: view)
let subview = view?.hitTest(loc, with: nil) // note: it is a `UIView?`