IOS learning notes 1-iphone program running process

IPhone program running process

Main. M file, the main entry of the IOS Application

The two parameters of the main function are command line parameters, which are not used in iOS development. These two parameters are used to be consistent with the standard ansi c.

Uiapplicationmain function:

Provide a primary entry point for the application, and create a new application instance and its delegation. Delegate to handle application status changes and provide responses to those changes

After the window is started and loaded, the application delegate is removed from the background, and almost all application semantics are transferred to a subclass of the uiviewcontroller class. The application delegate usually does not play a role unless the application is about to end, or memory problems. A

Main () ---> application delegate (appdelegate) ----> View Controller (uiviewconstroller)

Application icons and application Images

Icon.pngand default.png. The former is the application icon and the latter is the startup screen.

Icon.png size: 29*29 (displayed in settings) 57*57 (desktop icon) 512*512 (for release presentation)

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