?_activityView = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
?_activityView.center = self.view.center;
?_activityView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
?_activityView.hidesWhenStopped = YES;
?_activityView.color = [UIColor greenColor];
?[self.view addSubview:_activityView];
在需要開始的地方調(diào)用：
?[_activityView startAnimating];
在需要結(jié)束的地方調(diào)用：
[_activityView stopAnimating];
