How to tell if an app is running after first run or upgrade after it's installed in iOS

For first-time installed apps, you can use the following methods to determine

[[Nsuserdefaults Standarduserdefaults] boolforkey:@ "Firstlaunch"];

If the app is upgraded via the App Store, you can use the version number to determine

[[[NSBundle Mainbundle] infodictionary] objectforkey:@ "cfbundleversion"];

Actual use can add the following code in Didfinishlaunchingwithoptions:

    if (![ [Nsuserdefaults Standarduserdefaults] boolforkey:@ "Firstlaunch"]) {[[Nsuserdefaults standarduserdefaults] SetBool:        YES forkey:@ "Firstlaunch"];        NSLog (@ "launch app for the first time after installation"); Get the current app version number and deposit it in nsuserdefaults nsstring* appversion = [[[NSBundle Mainbundle] infodictionary] objectforkey:@ "CFBund        Leversion "];        Nsuserdefaults *userdefaults = [Nsuserdefaults standarduserdefaults];        [Userdefaults setobject:appversion forkey:@ "appversion"];    [Userdefaults Synchronize]; } else {//depending on the version number to determine if the update was first started after nsstring* appversion = [[[NSBundle Mainbundle] infodictionary] objectforkey:@        "Cfbundleversion"];        Nsuserdefaults *userdefaults = [Nsuserdefaults standarduserdefaults];        nsstring* localversion = [userdefaults stringforkey:@ "appversion"];        if ([appversion isequaltostring:localversion]) {NSLog (the app is not first opened after installation or upgrade);            } else {NSLog (the app is first opened after upgrade);    Deposit the current app version number in Nsuserdefaults        [Userdefaults setobject:appversion forkey:@ "appversion"];        [Userdefaults Synchronize]; }    }

How to tell if an app is running after first run or upgrade after it's installed in iOS