加载JSON时的活动指示符（微调器）

Question

如何在使用JSON加载数据并输入标签时显示微调器？

使用此代码调用JSON并将值放在标签中：

-(void)loadJSON {

    NSString *urlString = [NSString stringWithFormat:@"http://www.abc.com/service/?id=John&response=json"];
    NSURL *url = [NSURL URLWithString:urlString];
    data = [NSData dataWithContentsOfURL:url];

    NSError *error;

    json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

    NSDictionary *loan = [json objectForKey:@"person"];

    labelFirstName.text=[loan objectForKey:@"firstName"];
    labelLastName.text = [loan objectForKey:@"lastName"];
    labelNickName.text = [loan objectForKey:@"nickName"];
}

Answer 1

尝试使用MBProgressHUD加载Json。

研究这个 - https://github.com/jdg/MBProgressHUD