How to tell if it's your first run?

Question

I wonder how I can check whether it's the first run of my ios app, in order to start with a specific view. I saw many ways to do with Objective-C, but not how to implement it in Xamarin.

Answer 1

I'm not familiar with Xamarin, but this sounds as easy as checking the existence of a custom entry, say LaunchedBefore, in NSUserDefaults at the app launch and writing it if not found.

Something like

public override void FinishedLaunching (UIApplication application) {
    var defaults = NSUserDefaults.StandardUserDefaults;
    const string key = "LaunchedBeforeKey";
    if (!defaults.BoolForKey(key)) {
        // First launch
        user.SetBool(true, key);
        defaults.Synchronize();

        // Do stuff specific to the first launch here...
    }

    //...
}

I'm using "LaunchedBefore" as opposed to "FirstLaunch" since BoolForKey() will return false in case the key doesn't exist, so it's semantically better this way.