如何在 swift 4 中使图像视图变圆

Question

虽然网上有这个问题的解决方法，但是我做不到，想做个圆图

我正在使用的代码：

extension UIImageView {        
    func makeRounded() {
        let radius = self.frame.width/2.0
        self.layer.cornerRadius = radius
        self.layer.masksToBounds = true
    }
 }

然后我在 viewdidload() 中调用此函数，如 imgvw.makeRounded()。但它不会来。请帮忙

之前的link对我没有帮助

Answer 1

重写 viewDidLayoutSubviews 将不必要地调用函数 makeRounded() 因为每次在超级视图中发生某些布局时都会调用它。你应该使用这个：

class RoundedImageView: UIImageView {

    @override func layoutSubviews() {
        super.layoutSubviews()
        let radius = self.frame.width/2.0
        layer.cornerRadius = radius
        clipsToBounds = true // This could get called in the (requiered) initializer
        // or, ofcourse, in the interface builder if you are working with storyboards
    }

}

将 imageView 的 class 设置为 RoundedImageView

Answer 2

import UIKit

class ViewController: UIViewController {
  @IBOutlet weak var image: UIImageView!

  func makeRounded() {

    image.layer.borderWidth = 1
    image.layer.masksToBounds = false
    image.layer.borderColor = UIColor.blackColor().CGColor
    image.layer.cornerRadius = image.frame.height/2 //This will change with corners of image and height/2 will make this circle shape
    image.clipsToBounds = true
}

快乐编码

Answer 3

为您的 class

创建一个扩展

extension ViewController: UIViewController{

    func makeRounded() {

        layer.borderWidth = 1
        layer.masksToBounds = false
        layer.borderColor = UIColor.blackColor().CGColor
        layer.cornerRadius = frame.height/2 
        clipsToBounds = true
    }

}

然后调用使用它

imageView.makeRounded()

Answer 4

我的代码运行良好。

avatar.layer.borderWidth = 1
avatar.layer.masksToBounds = false
avatar.layer.borderColor = UIColor(hexString: "#39B44E").cgColor
avatar.layer.cornerRadius = avatar.frame.height/2 //This will change with corners of image and height/2 will make this circle shape
avatar.clipsToBounds = true

如何在 swift 4 中使图像视图变圆

How to make image view round in swift 4

uiimageview

uiimage

ios

swift

swift4