How to show alert once after installing the app in ios device

问题

How to show an alert only once at the start of an application after installing the application on device or on simulator until I delete it from my device. Is it possible tell me..

回答1:

You can do it this way:

if (![[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"]) {
   //first launch
   //show your alert
   [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"];
   [[NSUserDefaults standardUserDefaults] synchronize];
}
else
{
    // app already launched
}

来源：https://stackoverflow.com/questions/14495747/how-to-show-alert-once-after-installing-the-app-in-ios-device