iOS 应用版本检测更新

-( void )checkVersion:( id )sender{
   
    dict_version =[[sender objectFromJSONData ] copy ];
   
    // 获取用户安装当前客户端的版本号
    NSDictionary *infoDictionary = [[ NSBundle mainBundle ] infoDictionary ];
    // 版本号存入数组
    NSString *now_version = [infoDictionary objectForKey : @"CFBundleVersion" ];
    // 版本号存入数组
    NSArray *local_version_arr=[now_version componentsSeparatedByString : @"." ];
    ////NSLog(@"local_version_arr is %@",local_version_arr);
   
    // 从服务器获取的版本号
    NSString *new_version = [ dict_version objectForKey : @"version" ];
    // 从服务器获取的更新内容
    NSString *updateContern = [ dict_version objectForKey : @"update_content" ];
   
    // 判断获取的内容是不是正确
    if (![new_version isEqual :[ NSNull null ]] && ![new_version isEqual : @"" ]) {
        // 将版本号以 “.” 为间隔存入数组中
        NSArray *new_version_arr=[new_version componentsSeparatedByString : @"." ];
        // 比较服务器版本号和当前应用版本号
        for ( int i= 0 ; i<[new_version_arr count ];i++ ) {
            if ([[new_version_arr objectAtIndex :i] intValue ]>[[local_version_arr objectAtIndex :i] intValue ]) {
                UIAlertView *updateAlert=[[ UIAlertView alloc ] initWithTitle : @" 版本更新提示 " message :updateContern delegate : self cancelButtonTitle : @" 稍后提示 " otherButtonTitles : @" 现在更新 " , nil ];
                [updateAlert show ];
                [updateAlert release ];
                break ;
            } else if ([[new_version_arr objectAtIndex :i] intValue ]==[[local_version_arr objectAtIndex :i] intValue ]) {
                continue ;
            } else {
                return ;
            }

        }

    }
}
#pragma mark - uialert delegate
- ( void )alertView:( UIAlertView *)alertView clickedButtonAtIndex:( NSInteger )buttonIndex{
   
    if (buttonIndex == 1 ) {
        NSLog ( @"downloadUrl is %@" ,[ dict_version objectForKey : @"downloadUrl" ]);

       [[UIApplication sharedApplication ] openURL :[ NSURL URLWithString :[ dict_version objectForKey : @"downloadUrl"]]];

                // [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-services://?action=download-manifest&url=https://xxx.plist"]];

    }

}