1 UIActivityIndicatorView *av = [[UIActivityIndicatorView alloc] init]; // 活动图标 2 av.frame = CGRectMake(0, 0, 50, 50); 3 av.center = self.view.center; 4 av.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite; // 白色样式 5 av.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray; // 灰色样式 6 av.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge; // 大白样式 7 8 [av startAnimating]; 9 10 [av stopAnimating];