App lifecycle and appledelegate, scenedelegate

App Call to order  

AppDelegate

didFinishLaunchingWithOptions

App Call after startup didFinishLaunchingWithOptions, Will usually SDK This kind of large function package is put inside （ For example, the map of Gaud SDK）.

App First boot , Slide up and open again , as well as xcode Rerun the method .

 configurationForConnecting

APP This method will be called during some configuration after startup , Call when a window is about to be generated , And return to the configuration of a window , This configuration will connect to info.plist in .

SceneDelegate 

willConnectTo

If you use storyboard Then the visual window is automatically created , In this method, you can set app home page vc 

sceneWillForeground

 app Call this method when you are about to return to the foreground

 sceneDidEnterBackground

app The method has been called in the background  

sceneDidBecomeActive 

Backstage to front desk or open app, Call this method when it has been activated  

sceneDidDisconnect

close app Or call this method shortly after encountering the background , You can add the operation of manually releasing resources in the method . 

didDiscardSceneSession 

close app call

ViewController Life cycle function  

viewWillAppear

The page is about to appear, call this method  

viewDidAppear 

The page has appeared to call this method  

viewWillDisappear

  The page is about to disappear, call this method

viewDidDisappear 

Call this method when the page has disappeared  

  The above life cycle function is also called hook function

 

The remaining methods are not repeated here .