Question

i create an apps that i want to prompt an message for the user.. maybe using UIAlertview. After that, if the user run the apps for the second time, the alert won’t prompt up anymore.

is that possible? honestly i don’t have any idea about how to doing this.
Any idea? I search on STO, actually this link, still confused.

what is NSUserDefaults? How can NSUserDefaults store this information? i mean this is my first time or second time.

thanks.

Answer 1

To know what’s NSUserDefaults, I suggest to take a look the official doc.

And of course you can use it to fulfill your goal.
You use a user default to store information about the current amount of runs in the app.

More or less like:

BOOL isRunMoreThanOnce = [[NSUserDefaults standardUserDefaults] boolForKey:@"isRunMoreThanOnce"];
if(!isRunMoreThanOnce){
    // Show the alert view
    // Then set the first run flag
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"isRunMoreThanOnce"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}