iOS 通过苹果开放API检测更新

#define APPID @"1067207206"

-(void)onCheckVersion
{
    NSDictionary *infoDic = [[NSBundle mainBundle] infoDictionary];
    //CFShow((__bridge CFTypeRef)(infoDic));
    NSString *currentVersion = [infoDic objectForKey:@"CFBundleVersion"];

    NSString *URL = [NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=%@",APPID];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:URL]];
    [request setHTTPMethod:@"POST"];
    NSHTTPURLResponse *urlResponse = nil;
    NSError *error = nil;
    NSData *recervedData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];

    NSString *results = [[NSString alloc] initWithBytes:[recervedData bytes] length:[recervedData length] encoding:NSUTF8StringEncoding];
    NSDictionary *dic = [results JSONValue];
    NSArray *infoArray = [dic objectForKey:@"results"];
    if ([infoArray count]) {
        NSDictionary *releaseInfo = [infoArray objectAtIndex:0];
        NSString *lastVersion = [releaseInfo objectForKey:@"version"];

        if (![lastVersion isEqualToString:currentVersion]) {
            //trackViewURL = [releaseInfo objectForKey:@"trackVireUrl"];
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"更新" message:@"有新的版本更新，是否前往更新？" delegate:self cancelButtonTitle:@"关闭" otherButtonTitles:@"更新", nil];
            alert.tag = 10000;
            [alert show];
        }
        else
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"更新" message:@"此版本为最新版本" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
            alert.tag = 10001;
            [alert show];
        }
    }
}