iOS实现应用更新及强制更新

//检查版本更新
-(void)checkVersionUpdate{
   
    //检查更新
    NSString *stringVer = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString*)kCFBundleVersionKey];
    [[NetWorkRequest shareRequest]updateNewVersionWithversioncode:stringVer serverSuccessFn:^(id response) {
        if ([[response objectForKey:@"qzupdate"] intValue] == 1 &&
            [[response objectForKey:@"updateurl"] length] > 0) {
            DebugLog(@"需要强制更新");
            NSString *mes = [NSString stringWithFormat:@"发现最新版本%@,需更新后才能继续使用\n更新内容:%@",[response objectForKey:@"versioncode"],[response objectForKey:@"descr"]];
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示"
                                                                message:mes
                                                               delegate:self
                                                      cancelButtonTitle:nil
                                                      otherButtonTitles:@"确定", nil];
            alertView.tag = 1001;
            [alertView show];
        }else if ([[response objectForKey:@"isupdate"] intValue] == 1 &&
                  [[response objectForKey:@"updateurl"] length] > 0) {
           
            NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
            NSString *version = [userDefaults objectForKey:@"Version_To_Update"];//待更新的版本
            version_to_update = [response objectForKey:@"versioncode"];
            if ([stringVer floatValue] < [version floatValue] &&
                [version_to_update floatValue] <= [version floatValue]) {
                //当前待更新版本已点击取消并在本地保存的待更新版本，不弹出提示框
               
            }else {
                //弹出提示框进行更新
               
               
                NSString *mes = [NSString stringWithFormat:@"发现最新版本%@,是否更新?\n更新内容:%@",[response objectForKey:@"versioncode"],[response objectForKey:@"descr"]];
                UIAlertView *alertTi = [[UIAlertView alloc] initWithTitle:@"提示"
                                                                  message:mes
                                                                 delegate:self
                                                        cancelButtonTitle:@"取消"
                                                        otherButtonTitles:@"确定", nil];
                alertTi.tag = 1002;
                [alertTi show];
            }
           
        }else{
            //DebugLog(@"不需要更新");
        }
    } serverFailureFn:^(NSError *error, id response) {
       
    }];
}