JSON加载时的活动指示器（微调器）

Question

如何在使用JSON加载数据并放入标签时显示微调器？

使用此代码来调用JSON并把值标签：

-(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

试试您的JSON加载与MBProgressHUD。

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