iOS小技巧13- 判断iOS App程序安装后第一次启动，更新后第一次启动

iOS小技巧13- 判断iOS App程序安装后第一次启动，更新后第一次启动

1、判断程序第一次启动

 /*
     NSUserDefaults 全局的--保存到Preferences  存数据比较少，可以用来传值
     适合存储轻量级的本地数据，比如要保存一个登陆界面的数据，用户名、密码之类。
     NSUserDefaults支持的数据格式有：NSNumber（Integer、Float、Double），NSString，NSDate，NSArray，NSDictionary，BOOL类型。
     
     */
    NSUserDefaults *myUD=[NSUserDefaults standardUserDefaults];
 
    if(![myUD boolForKey:@"firstStart"])
    {
        [myUD setBool:YES forKey:@"firstStart"];
        [myUD synchronize];//同步
        NSLog(@"第一次启动");
        
    }else{
        NSLog(@"不是第一次启动");
    }
    

2、判断程序是否更新后第一次启动

- (BOOL) isAppFirstRun{
    NSString *currentVersion = [[[NSBundle mainBundle] infoDictionary]
                                objectForKey:@"CFBundleShortVersionString"];
    
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    
    NSString *lastRunKey = [defaults objectForKey:@"last_run_version_key"];
    
    if (!lastRunKey) {
        [defaults setObject:currentVersion forKey:@"last_run_version_key"];
        return YES;
        // App is being run for first time
        //上次运行版本为空，说明程序第一次运行
        
    }
    else if (![lastRunKey isEqualToString:currentVersion]) {
        [defaults setObject:currentVersion forKey:LAST_RUN_VERSION_KEY];
        return YES;
        // App has been updated since last run
        //有版本号，但是和当前版本号不同，说明程序已经更新了版本
    }
    return NO;
    
    
    
}

[[NSBundle mainBundle] infoDictionary]的内容

/*
 
 [[[NSBundle mainBundle] infoDictionary]={
 BuildMachineOSBuild = 14F27;
 CFBundleDevelopmentRegion = en;
 CFBundleExecutable = firstRunApp;
 CFBundleIdentifier = "LotusNing.firstRunApp";
 CFBundleInfoDictionaryVersion = "6.0";
 CFBundleInfoPlistURL = "Info.plist -- file:///Users/l/Library/Developer/CoreSimulator/Devices/4BE9A476-F866-47D0-AA53-F4C3D57452F2/data/Containers/Bundle/Application/BEC096F3-10C3-4BFB-BC75-03C35289BB9F/firstRunApp.app/";
 CFBundleName = firstRunApp;
 CFBundleNumericVersion = 16809984;
 CFBundlePackageType = APPL;
 CFBundleShortVersionString = "1.0";
 CFBundleSignature = "????";
 CFBundleSupportedPlatforms =     (
 iPhoneSimulator
 );
 CFBundleVersion = 1;
 DTCompiler = "com.apple.compilers.llvm.clang.1_0";
 DTPlatformBuild = "";
 DTPlatformName = iphonesimulator;
 DTPlatformVersion = "9.0";
 DTSDKBuild = 13A340;
 DTSDKName = "iphonesimulator9.0";
 DTXcode = 0701;
 DTXcodeBuild = 7A1001;
 LSRequiresIPhoneOS = 1;
 MinimumOSVersion = "9.0";
 UIDeviceFamily =     (
 1,
 2
 );
 UILaunchStoryboardName = LaunchScreen;
 UIMainStoryboardFile = Main;
 UIRequiredDeviceCapabilities =     (
 armv7
 );
 UISupportedInterfaceOrientations =     (
 UIInterfaceOrientationPortrait,
 UIInterfaceOrientationLandscapeLeft,
 UIInterfaceOrientationLandscapeRight
 );
 }
 
 */

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