在开发中我们经常会遇到对一个UIView 设置四个圆角的情况，这种情况是很好处理的。但是如果遇到只设置其中的某几个圆角的情况怎么办呢？有一种方法是通过UIBezierPath的方法来做，代码如下：
/**
* 设置uiview 的任意圆角
**/
func SetMutiBorderRoundingCorners(_ view:UIView,corner:CGFloat)
{
let maskPath = UIBezierPath.init(roundedRect: view.bounds,
byRoundingCorners: [UIRectCorner.bottomLeft, UIRectCorner.topRight],
cornerRadii: CGSize(width: corner, height: corner))
let maskLayer = CAShapeLayer()
maskLayer.frame = view.bounds
maskLayer.path = maskPath.cgPath
view.layer.mask = maskLayer
}
此外，我们还会遇到给一个UIview设置某几条边框而不是全部边框的情况，解决办法如下：
func SetBorderWithView(_ view:UIView,top:Bool,left:Bool,bottom:Bool,right:Bool,width:CGFloat,color:UIColor)
{
if top
{
let layer = CALayer()
layer.frame = CGRect(x: 0, y: 0, width: view.frame.size.width, height: width)
layer.backgroundColor = color.cgColor
view.layer.addSublayer(layer)
}
if left
{
let layer = CALayer()
layer.frame = CGRect(x: 0, y: 0, width: width, height: view.frame.size.height)
layer.backgroundColor = color.cgColor
view.layer.addSublayer(layer)
}
if bottom
{
let layer = CALayer()
layer.frame = CGRect(x: 0, y: view.frame.size.height - width, width: width, height: width)
layer.backgroundColor = color.cgColor
view.layer.addSublayer(layer)
}
if right
{
let layer = CALayer()
layer.frame = CGRect(x: view.frame.size.width - width, y: 0, width: width, height: view.frame.size.height)
layer.backgroundColor = color.cgColor
view.layer.addSublayer(layer)
}
}
以上两种方法效果如下图所示
Simulator Screen Shot - iPhone 8 Plus - 2018-08-10 at 13.51.22.png
