这是我找到并使用的一段方便的代码:
extension UIView {
func addTopBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x:0,y: 0, width:self.frame.size.width, height:width)
self.layer.addSublayer(border)
}
func addRightBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x: self.frame.size.width - width,y: 0, width:width, height:self.frame.size.height)
self.layer.addSublayer(border)
}
func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x:0, y:self.frame.size.height - width, width:self.frame.size.width, height:width)
self.layer.addSublayer(border)
}
func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x:0, y:0, width:width, height:self.frame.size.height)
self.layer.addSublayer(border)
}
func addMiddleBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x:self.frame.size.width/2, y:0, width:width, height:self.frame.size.height)
self.layer.addSublayer(border)
}
}
只需在这样的任何视图上使用:
bottomControls.addMiddleBorderWithColor(color: buttonBorderColor, width: 3.0)
资料来源:如何在 UIButton 上仅添加 TOP 边框?