iOS UIView添加阴影

#Swift

1. UIView添加四边阴影效果

简单的一个函数，使用的swift语言

func addShadowToView(_ theView: UIView,_ theColor: UIColor) {
        theView.layer.shadowColor = theColor.cgColor
        theView.layer.shadowOffset = CGSize(width: 0, height: 0)
        theView.layer.shadowOpacity = 0.5
        theView.layer.shadowRadius = 5
}

2. UIView添加单边阴影效果

func addShadowToView(_ theView: UIView,_ theColor: UIColor) {
        theView.layer.shadowColor = theColor.cgColor
        theView.layer.shadowOffset = CGSize(width: 0, height: 0)
        theView.layer.shadowOpacity = 0.5
        theView.layer.shadowRadius = 5
        // 单边阴影 顶边
        let shadowPathWidth = theView.layer.shadowRadius
        let shadowRect = CGRect(x: 0, y: 0-shadowPathWidth/2.0, width: theView.bounds.size.width, height: shadowPathWidth)
        let path = UIBezierPath.init(rect: shadowRect)
        theView.layer.shadowPath = path.cgPath
    }

#Swift