objective-c – 使用UITapGestureRecognizer查找查看哪个子视图

当使用UIGestureRecognizer时，如何知道事件发生在哪个子视图中？

根据文档：

A gesture recognizer operates on
touches hit-tested to a specific view
and all of that view’s subviews.

据我所见，’view’属性是

The view the gesture recognizer is
attached to.

这将是父视图。

解决方法

这将在事件的位置找到最内层的后代视图。 (请注意，如果该子视图有任何交互式内部私有孙代码，这段代码也会找到那些。)

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

在Swift 2：

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

在Swift 3：

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