如何只为左下角，右下角和左上角的textview设置cornerRadius？

Question

如何仅在左下角，右下角和左上角的textview中设置角半径？

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)

这段代码创建了两个rect。我不知道为什么。

Answer 1

您只需要屏蔽图层，如下所示：

对于Swift 3：

    let rectShape = CAShapeLayer()
    rectShape.bounds = self.myView.frame
    rectShape.position = self.myView.center
    rectShape.path = UIBezierPath(roundedRect: self.myView.bounds, byRoundingCorners: [.bottomLeft , .bottomRight , .topLeft], cornerRadii: CGSize(width: 20, height: 20)).cgPath

     self.myView.layer.backgroundColor = UIColor.green.cgColor
    //Here I'm masking the textView's layer with rectShape layer
     self.myView.layer.mask = rectShape

较低版本：

let rectShape = CAShapeLayer()
rectShape.bounds = self.myView.frame
rectShape.position = self.myView.center
rectShape.path = UIBezierPath(roundedRect: self.myView.bounds, byRoundingCorners: .BottomLeft | .BottomRight | .TopLeft, cornerRadii: CGSize(width: 20, height: 20)).CGPath

 self.myView.layer.backgroundColor = UIColor.greenColor().CGColor
//Here I'm masking the textView's layer with rectShape layer
 self.myView.layer.mask = rectShape

Answer 2

（swift 4 / iOS 11）只是简单地说底部：

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:)

Answer 3

在xcode 8和swift 3中测试过

extension UIView {
    func roundCorners(_ corners:UIRectCorner, radius: CGFloat) {
    let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
    let mask = CAShapeLayer()
    mask.path = path.cgPath
    self.layer.mask = mask
  }
}

像这样使用

YourView.roundCorners([.topLeft, .bottomLeft], radius: 10)

Answer 4

iOS 11和iOS 10底角的更好答案是

 if #available(iOS 11.0, *){
        view.clipsToBounds = false
        view.layer.cornerRadius = 10
        view.layer.maskedCorners = [.layerMaxXMaxYCorner, .layerMinXMaxYCorner]
    }else{
       let rectShape = CAShapeLayer()
       rectShape.bounds = view.frame
       rectShape.position = view.center
       rectShape.path = UIBezierPath(roundedRect: view.bounds,    byRoundingCorners: [.bottomLeft , .bottomRight], cornerRadii: CGSize(width: 20, height: 20)).cgPath
      view.layer.backgroundColor = UIColor.green.cgColor
      view.layer.mask = rectShape
  }

如果这在iOS 10及更低版本上无效，请尝试在viewcontroller类的viewDidLayoutSubviews（）中运行代码，如下所示

override func viewDidLayoutSubviews() {
    if #available(iOS 11.0, *){
    }else{
       let rectShape = CAShapeLayer()
       rectShape.bounds = view.frame
       rectShape.position = view.center
       rectShape.path = UIBezierPath(roundedRect: view.bounds,    byRoundingCorners: [.bottomLeft , .bottomRight], cornerRadii: CGSize(width: 20, height: 20)).cgPath
       view.layer.backgroundColor = UIColor.green.cgColor
       view.layer.mask = rectShape
}

Answer 5

Swift 4

override func viewDidLoad() {
    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
    topRight.roundedTop()
    topRight.backgroundColor = .red
    self.view.center = topRight.center
    self.view.addSubview(topRight)
    super.viewDidLoad()
}

输出：

UIView Swift 4上的扩展：Reference Link

Answer 6

这是iOS 11+的扩展

 import Foundation
 import UIKit

 extension UIView {

   func roundCorners(_ corners: CACornerMask, radius: CGFloat, borderColor: UIColor, borderWidth: CGFloat) {
       self.layer.maskedCorners = corners
       self.layer.cornerRadius = radius
       self.layer.borderWidth = borderWidth
       self.layer.borderColor = borderColor.cgColor

   }

 }

用法：-

self.yourView.roundCorners([.layerMaxXMaxYCorner, .layerMaxXMinYCorner], radius: 20.0, borderColor: UIColor.green, borderWidth: 1)

Answer 7

1. 将RoundedCornerView.swift文件添加到您的项目中
2. 将UIView添加到ViewController
3. 将Identity Inspector中的自定义类更改为RoundedCornerView
4. 转到属性检查器选择“角半径”（CGFloat）并在要舍入的角上。

RoundedCornerView.swift

import UIKit

@IBDesignable
class RoundedCornerView: UIView {

    var cornerRadiusValue : CGFloat = 0
    var corners : UIRectCorner = []

    @IBInspectable public var cornerRadius : CGFloat {
        get {
            return cornerRadiusValue
        }
        set {
            cornerRadiusValue = newValue
        }
    }

    @IBInspectable public var topLeft : Bool {
        get {
            return corners.contains(.topLeft)
        }
        set {
            setCorner(newValue: newValue, for: .topLeft)
        }
    }

    @IBInspectable public var topRight : Bool {
        get {
            return corners.contains(.topRight)
        }
        set {
            setCorner(newValue: newValue, for: .topRight)
        }
    }

    @IBInspectable public var bottomLeft : Bool {
        get {
            return corners.contains(.bottomLeft)
        }
        set {
            setCorner(newValue: newValue, for: .bottomLeft)
        }
    }

    @IBInspectable public var bottomRight : Bool {
        get {
            return corners.contains(.bottomRight)
        }
        set {
            setCorner(newValue: newValue, for: .bottomRight)
        }
    }

    func setCorner(newValue: Bool, for corner: UIRectCorner) {
        if newValue {
            addRectCorner(corner: corner)
        } else {
            removeRectCorner(corner: corner)
        }
    }

    func addRectCorner(corner: UIRectCorner) {
        corners.insert(corner)
        updateCorners()
    }

    func removeRectCorner(corner: UIRectCorner) {
        if corners.contains(corner) {
            corners.remove(corner)
            updateCorners()
        }
    }

    func updateCorners() {
        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: cornerRadiusValue, height: cornerRadiusValue))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        self.layer.mask = mask
    }

}

github链接：RoundedCornerView

Answer 8

问题现在解决了右上角和右上角的问题

iOS 9,10,11版中经过测试的代码

 extension UIView {
        func roundCorners(_ corners:UIRectCorner,_ cormerMask:CACornerMask, radius: CGFloat) {
            if #available(iOS 11.0, *){
                self.clipsToBounds = false
                self.layer.cornerRadius = radius
                self.layer.maskedCorners = cormerMask
            }else{
                let rectShape = CAShapeLayer()
                rectShape.bounds = self.frame
                rectShape.position = self.center
                rectShape.path = UIBezierPath(roundedRect: self.bounds,    byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius)).cgPath
                self.layer.mask = rectShape
            }
        }

    }