objective-c - ios EnterBackground 之后，桌面这种效果 怎么做到的

Question

手机的状态栏，有红色的一层view，点击view可以跳转到自己的app

Answer 1

This will appear during recording or call status, but I don’t know about other situations.

Answer 2

You implement the background running function. Just press the home button again

Answer 3

A red bar will appear in the system during recording or calling, and you cannot manually create this effect

Answer 4

This should be knowledge about local message push