自定义UIImageView边框

Question

我正在尝试这样制作边框：

使用以下代码：

self.slot1.layer.cornerRadius = self.slot1.bounds.height / 2
self.slot1.layer.borderWidth = 1.5
self.slot1.layer.borderColor = UIColor.orange.cgColor 

它产生：

如何在边框和实际图像之间添加“间距”？

Answer 1

您可以使用以下扩展程序来实现

extension UIImage {
    func imageWithInsets(insets: UIEdgeInsets) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(
            CGSize(width: self.size.width + insets.left + insets.right,
                   height: self.size.height + insets.top + insets.bottom), false, self.scale)
        let _ = UIGraphicsGetCurrentContext()
        let origin = CGPoint(x: insets.left, y: insets.top)
        self.draw(at: origin)
        let imageWithInsets = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return imageWithInsets
    }
}

使用下面的代码在图像和边框之间添加空间，我在此处添加20，您可以提供自己的空间

self.slot1.layer.cornerRadius = self.slot1.bounds.height / 2
self.slot1.layer.borderWidth = 1.5
self.slot1.layer.borderColor = UIColor.orange.cgColor
let image = self.slot1.image?.imageWithInsets(insets: UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20))
self.slot1.image = image

希望获得帮助！

Answer 2

与其尝试在两者之间留出空间，不如在里面放一个UIView，将UIImageView放在其中。 UIImageView的{​​{1}}较少，然后将两者都添加width and height，而仅将corner radius添加到border color。

您的用户界面应如下所示：

Answer 3

在操场上跑步

import PlaygroundSupport
import UIKit

let iv = UIImageView(frame: CGRect(x: 0.0, y: 0.0, width: 200, height: 200))
PlaygroundPage.current.liveView = iv

iv.backgroundColor = .blue
iv.layer.cornerRadius = 100
iv.layer.borderColor = UIColor.red.cgColor
iv.layer.borderWidth = 5
iv.layer.sublayers?.count

let layer2 = CAShapeLayer()
let newFrame = iv.bounds.insetBy(dx: 7, dy: 7)
layer2.path = UIBezierPath(roundedRect: newFrame, cornerRadius: newFrame.height / 2).cgPath
layer2.frame = iv.bounds
layer2.lineWidth = 5
layer2.strokeColor = UIColor.yellow.cgColor
layer2.fillColor = UIColor.clear.cgColor
iv.layer.addSublayer(layer2)