IOS检测版本更新(***为app id)

/测试版本更新
-(void)GetUpdate
{
    NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary];
    NSString *nowVersion = [infoDict objectForKey:@"CFBundleVersion"];
    NSURL *url = [NSURL URLWithString:@"http://itunes.apple.com/lookup?id=6224939"];//
    NSString * file =  [NSString stringWithContentsOfURL:url];
    file= [file stringByReplacingOccurrencesOfString:@"\n" withString:@""];
    if(file !=nil)
    {
        int count= [[g_json GetValueWithJsonKey:file key:@"resultCount"]intValue];
        if(count>0)
        {
            file = [file substringWithRange:NSMakeRange(31, file.length-33)];
            NSString *newVersion = [g_json GetValueWithJsonKey:file key:@"version"];
            if([nowVersion isEqualToString:newVersion]==NO)
            {
                [self performSelectorOnMainThread:@selector(AlertNewVersion:) withObject:nil waitUntilDone:NO];
            }
        }
    }
}
-(void)AlertNewVersion:(id)sender
{
    UIAlertView *alertNewVer = [[UIAlertView alloc]initWithTitle:nil message:@"版本有更新" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"更新", nil];
    [alertNewVer show];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if(buttonIndex==1)
    {
        NSURL *url = [NSURL URLWithString:@"https://itunes.apple.com/us/app/xg-ke-hui/id622493449?ls=1&mt=8"];
        [[UIApplication sharedApplication]openURL:url];
    }
}