Making an Alert apper after a certain amount of lanuches

Question

I am working on this idea where I want an UIAlert to pop up after a certain amount of launches of the app (let's say after 20 launches).

And there's going to be 2 buttons. One that will reset the counter which will make the alert appear after another 20 launches. And one button that will make it disappear and never appear again.

How I would do this?

Answer 1

In your AppDelegate applicationDidFinishLaunching:withOptions: method check NSUserDefaults:

int counter = [[NSUserDefaults standardUserDefaults] integerForKey:@"LaunchesCounter"];
if (counter == -1)
{ /* Cancel chekcing, cause earlier user choose hide alert */ }
else if (counter >= 20)
{ /* Show alert */ }
else // Increment counter
{
    ++counter;
    [[NSUserDefaults standardUserDefaults] setInteger:counter forKey:@"LaunchesCounter"];
}

If user choose continue to show alert rewrite counter with 0:

[[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"LaunchesCounter"];

If user choose to hide alerts set counter to -1:

[[NSUserDefaults standardUserDefaults] setInteger:-1 forKey:@"LaunchesCounter"];