// _closeContainerBar.alpha = 0.7;
_closeContainerBar.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.7];
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// _closeContainerBar.alpha = 0.7;
_closeContainerBar.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.7];
转载于:https://www.cnblogs.com/willbin/p/3817348.html