迅速
label1.layer.shadowOffset = CGSize(width: 3, height: 3) label1.layer.shadowOpacity = 0.7 label1.layer.shadowRadius = 2
迅捷3
label1.layer.shadowOffset = CGSize(width: 3, height: 3) label1.layer.shadowOpacity = 0.7 label1.layer.shadowRadius = 2
目标C
label1.layer.shadowOffset = CGSizeMake(3, 3); label1.layer.shadowOpacity = 0.7; label1.layer.shadowRadius = 2;