应用的生命周期
Documentation URL
https://developer.apple.com/documentation/uikit/core_app/managing_your_app_s_life_cycle?language=objc
APP生命周期状态
管理生命周期事件
https://developer.apple.com/documentation/uikit/core_app/managing_your_app_s_life_cycle?language=objc
-
Launch
初始化APP准备启动;
- APP启动时序
- 执行一次APP配置
- APP启动时序
-
Activation
APP显示到前台
- 准备
- [ApplicationDelegate applicationDidBecomeActive:]
当APP处于active状态时,回调
- [ApplicationDelegate applicationWillEnterForeground:]
如果APP已经处于background,怎会先调用该方法,之后再回调applicationDidBecomeActive:方法;
- [ViewController viewWillAppear:]
更新视图内容
- [ViewController viewDidAppear:]
在视图出现在屏幕上后回调;
- [ApplicationDelegate applicationDidBecomeActive:]
- 准备
-
Deactivation
APP处于background,被阻塞;
- [ApplicationDelegate applicationWillResignActive:]
首先调用该方法 ;在该过程中会中断app操作和保存用户关键数据;
- [ApplicationDelegate applicationDidEnterBackground:]
APP进入background回调该方法;
- [ApplicationDelegate applicationWillResignActive:]
- Background execution
- Termination