ios-Responder Chain

The event response process of the responder chain:

1. The event response of the button clicked on the analog view

Second, recursive invocation of the HitTest method

1,-(uiview*) HitTest: (Cgpoint) Withevent: (uievent*) event;

This method is used by the system to recursively traverse which view responds to the event, defined in UIView,

If there is a child view inside the view, the method is called recursively at the first level;

The point parameter refers to the coordinates of the event operation in this view, which is used to determine whether the event operation is in the valid range of this view,

If it is within the valid range of this view, it is always recursive to the child view, otherwise it stops; (this can reasonably explain why a child view cannot respond to an event after it is outside the valid range of the parent view);

2, here to simulate two scenes

2.1:

ios-Responder Chain