UIView 半透明上的按钮不可见答案

【问题标题】：Buttons on UIView semitransparent are not visibleUIView 半透明上的按钮不可见
【发布时间】：2012-12-21 14:03:08
【问题描述】：

我有一个 UIView，其中一些部分是半透明的（alpha

-(void)viewDidLoad{
  //......
  self.viewSito = [[UIView alloc]init];
  //this view has some parts semi-trasparent and other opaque

  self.buttonClose =[UIButton buttonWithType:UIButtonTypeRoundedRect];
  self.buttonClose.backgroundColor=[UIColor blackColor];
  self.buttonClose.alpha =1.0;
 /*the output is semi-transparent when is on uiview semi-transparent, but when uiview is 
  opaque the button is not visible, as if it were "hidden" from the opaque part 
  of the view.*/
  //...

 [self.viewSito addSubview:self.buttonClose];

}

按钮还能用，只是能见度的问题。怎么办？

【问题讨论】：

标签： uiview uibutton subview alpha

【解决方案1】：

尝试以这种方式将您的 UIView 设置为半透明：

myView.backgroundColor = [UIColor colorWithRed:0.1f green:.1f blue:.1f alpha:.7f];

设置 alpha 值

【讨论】：