IOS App Launch process

<span id="Label3"><p></p><p>#import <UIKit/UIKit.h></p><p>#import "AppDelegate.h"</p><p>The main function is the program entry</p><p>int main (int argc, char * Argv[]) {</p><p>@autoreleasepool {</p><p></p><p>return uiapplicationmain (argc, argv, nil, nsstringfromclass ([appdelegate class]));</p><p>The third parameter is UIApplication</p><p>The fourth parameter is Appdelegate must comply with the Uiapplicationdelegate protocol</p><p>}</p><p>}</p><p>1. Provide class name according to <em class="parameter-name">Principalclassname</em> to participate in UIApplication object</p><p>2. Create the Uiapplicationdelegate object and become the UIApplication object agent, app.delegte=delegte, Listener State</p><p>3 Turn on a main thread loop to handle events to keep the program running</p><p>4. Load the Info.plist and judge there is a wood with the designation Main. storyboard, specifies that the load</p><p></p><p>IOS App Launch process</p></span>