backGroundView.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.5];
或 (UIColor *)colorWithAlphaComponent:(CGFloat)alpha
backGroundView.backgroundColor = [UIColor colorWithWhite:0.f alpha:0.5];
或 (UIColor *)colorWithAlphaComponent:(CGFloat)alpha
本文标题:使用半透明背景 子视图不透明
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