iOS 应用版本检测更新

-(void)checkVersion:(id)sender{
   
    dict_version=[[senderobjectFromJSONData]copy];
   
    //获取用户安装当前客户端的版本号
    NSDictionary*infoDictionary = [[NSBundlemainBundle]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_versionobjectForKey:@"version"];
    //从服务器获取的更新内容
    NSString*updateContern = [dict_versionobjectForKey:@"update_content"];
   
    //判断获取的内容是不是正确
    if (![new_version isEqual:[NSNullnull]] && ![new_versionisEqual:@""]) {
        //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_arrcount];i++ ) {
            if([[new_version_arr objectAtIndex:i] intValue]>[[local_version_arr objectAtIndex:i] intValue]) {
                UIAlertView*updateAlert=[[UIAlertViewalloc]initWithTitle:@"版本更新提示"message:updateConterndelegate:selfcancelButtonTitle:@"稍后提示"otherButtonTitles:@"现在更新",nil];
                [updateAlert show];
                [updateAlert release];
                break;
            }elseif ([[new_version_arr objectAtIndex:i]intValue]==[[local_version_arrobjectAtIndex:i]intValue]) {
                continue;
            }else{
                return;
            }

        }

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

       [[UIApplicationsharedApplication]openURL:[NSURLURLWithString:[dict_versionobjectForKey:@"downloadUrl"]]];

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

    }

}