解决方法
添加UIActivityIndicatorView作为按钮的子视图：
// Create spinner UIActivityIndicatorView *myIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite]; // Position the spinner [myIndicator setCenter:CGPointMake(myButton.frame.size.width / 2,myButton.frame.size.height / 2)]; // Add to button [myButton addSubview:myIndicator]; // Start the animation [myIndicator startAnimating];
