UIView半透明按钮不可见

Question

我有一个UIView与一些半透明的部分（alpha < 1.0）和其他不透明。我想把按钮设置为不透明的子视图，我注意到它们的部分也变成了半透明的按钮，而在不透明按钮的其他部分，即使设置为alpha = 1.0，也不能看到它们。

-(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]; 

} 

该按钮仍然有效，这只是一个可见性问题。我该怎么办？

Answer 1

尝试设置你的UIView半trasparent这样：

myView.backgroundColor =的UIColor colorWithRed：0.1F绿色：.1F蓝：.1F阿尔法：.7f]。

设置阿尔法值