IOS中如何判断APP是否安装后首次运行或升级后首次运行

对于是否为首次安装的App可以使用如下方法来判断

[[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"];

如果App是通过App Store升级的话可以通过版本号来判断

[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];

实际使用可以在didFinishLaunchingWithOptions:中添加如下代码

    if(![[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]) {

        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"];

        NSLog(@"安装之后首次开启App");

        //获取当前App版本号并存入NSUserDefaults中

        NSString* appVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];

        NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

        [userDefaults setObject:appVersion forKey:@"appVersion"];

        [userDefaults synchronize];

    }

    else {

        //根据版本号判断是否更新后首次启动

        NSString* appVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];

        NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

        NSString* localVersion = [userDefaults stringForKey:@"appVersion"];

        if ([appVersion isEqualToString:localVersion]) {

            NSLog(@"安装或升级之后并非首次开启App");

        }

        else {

            NSLog(@"升级之后首次开启App");

            //将当前App版本号存入NSUserDefaults中

            [userDefaults setObject:appVersion forKey:@"appVersion"];

            [userDefaults synchronize];

        }

    }