self.layer.shadowOffset = CGSizeMake(0, 2);
self.layer.shadowColor = [UIColor blackColor].CGColor;
self.layer.shadowOpacity = 0.9;
self.layer.shadowRadius = 4;
self.layer.masksToBounds = NO;
需要加上最后一句，阴影才能显示出来
self.layer.shadowOffset = CGSizeMake(0, 2);
self.layer.shadowColor = [UIColor blackColor].CGColor;
self.layer.shadowOpacity = 0.9;
self.layer.shadowRadius = 4;
self.layer.masksToBounds = NO;
需要加上最后一句，阴影才能显示出来
本文标题：collectionViewCell添加阴影
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