ios开发－判断手机APP第一次启动

代码：

 //判断是不是第一次启动        if (![[NSUserDefaults standardUserDefaults]boolForKey:@"fristLaunch11"]) {                        [[NSUserDefaults standardUserDefaults]setBool:YES forKey:@"fristLaunch11"];            [[NSUserDefaults standardUserDefaults] synchronize];                        //使启动界面停留 2.0 秒            [NSThread sleepForTimeInterval:2.0];            userGuideViewController = [[UserGuideViewController alloc] init];            self.window.rootViewController = userGuideViewController;//设置启动根视图            [userGuideViewController release];        }        else        {            [NSThread sleepForTimeInterval:2.0];            getPicViewController = [[GetPicViewController alloc] init];            self.window.rootViewController = getPicViewController;            [getPicViewController release];        }