带标记的按钮

Question

如何获得带有特定标签的按钮

id喜欢然后将其转换为Button，并更改alpha

Answer 1

UIButton *button=(UIButton *)[self.view viewWithTag:tag];
button.alpha=0.5;

Answer 2

 UIView* view = [theViewContainingThatButton viewWithTag:tag];
 view.alpha = 0.5;

您无需将视图转换为UIButton来更改其alpha。但是，如果真的需要，你可以添加(UIButton*)演员。