Proper use of UIApplicationMain

允我心安 提交于 2019-11-30 02:24:55

This function is declared as

int UIApplicationMain (
   int argc,
   char *argv[],
   NSString *principalClassName,
   NSString *delegateClassName
);

Since you did not subclass UIApplication, pass nil to the 3rd argument. But you have a custom UIApplicationDelegate. So pass its class name to the 4th argument.

int retval = UIApplicationMain(argc, argv, nil, @"AppDelegate");
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