判断App是否首次启动

skyYangpan

于 2014-01-02 13:00:34 发布

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现在的APP中流行在程序第一次启动时显示一些新手引导页面，下面的代码可用于判断此APP是否第一次启动，或升级后的第一次启动。


#define LAST_RUN_VERSION_KEY        @"last_run_version_of_application"
- (BOOL) isFirstLoad{
     NSString *currentVersion = [[[NSBundle mainBundle] infoDictionary]
         objectForKey:@"CFBundleShortVersionString"];    

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSString *lastRunVersion = [defaults objectForKey:LAST_RUN_VERSION_KEY];

    if (!lastRunVersion) {
         [defaults setObject:currentVersion forKey:LAST_RUN_VERSION_KEY];
         return YES;
        // App is being run for first time
    }
    else if (![lastRunVersion isEqualToString:currentVersion]) {
        [defaults setObject:currentVersion forKey:LAST_RUN_VERSION_KEY];
        return YES;
        // App has been updated since last run
    }
    return NO;
}