UIColor self-study
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设置半透明背景
方法1,方法2.
1.self.backgroundColor = [UIColorcolorWithWhite:0 alpha:0.5];
在该view 上添加视图,仍为不透明的2.
self.backgroundColor = [UIColorblackColor];
self.alpha = 0.7;
在该View 上添加视图,即为透明的。
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