如何仅设置文本视图的左下角、右下角和左上角的角半径？
let rectShape = CAShapeLayer()
rectShape.backgroundColor = UIColor.redColor().CGColor
rectShape.bounds = messages.frame
rectShape.position = messages.center
rectShape.path = UIBezierPath(roundedRect: messages.bounds, byRoundingCorners: .BottomLeft | .TopRight, cornerRadii: CGSize(width: 20, height: 20)).CGPath
messages.layer.addSublayer(rectShape)
此代码创建两个矩形。我不知道为什么。
（swift 4/iOS 11）只需简单地说一下底部：
yourView.clipsToBounds = true
yourView.layer.cornerRadius = 10
yourView.layer.maskedCorners = [.layerMaxXMaxYCorner, .layerMinXMaxYCorner]
for Up:
yourView.clipsToBounds = true
yourView.layer.cornerRadius = 10
yourView.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMinXMinYCorner]
在你的情况下：
yourView.layer.maskedCorners = [.layerMaxXMaxYCorner, .layerMinXMaxYCorner, .layerMinXMinYCorner]
希望这有帮助:)
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)
