如果使用正常圆角， 在少量圆角时候不会有问题， 但大量圆角时候，因为离屏渲染， 就会有卡顿，这时候我们就需要这套代码了。
import Foundation
import UIKit
public class SKArchCutter_Swift: NSObject {
/** 切割UIView、UIButton和UILabel圆角
* @param view 需要进行切割的对象
* @param direction 切割的方向
* @param cornerRadii 圆角半径
* @param borderWidth 边框宽度
* @param borderColor 边框颜色
* @param backgroundColor 背景色
*/
public class func cuttingView(view: UIView, direction: UIRectCorner, cornerRadii: CGFloat, borderWidth: CGFloat, borderColor: UIColor, backgroundColor: UIColor)
{
var cornerRadii = cornerRadii
if view.bounds.size.height != 0 && view.bounds.size.width != 0 {// 使用Masonry布局后，view的bounds是异步返回的，这里需要做初步的判断
let width = view.bounds.size.width
let height = view.bounds.size.height
// 先利用CoreGraphics绘制一个圆角矩形
UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, UIScreen.main.scale)
let currentContext = UIGraphicsGetCurrentContext()
if (currentContext != nil) {
currentContext?.setFillColor(backgroundColor.cgColor)// 设置填充颜色
currentContext?.setStrokeColor(borderColor.cgColor)// 设置画笔颜色
if cornerRadii == 0 {
cornerRadii = view.bounds.size.height / 2
}
// 单切圆角
if direction == UIRectCorner.allCorners {
currentContext?.move(to: CGPoint.init(x: width - borderWidth, y: cornerRadii + borderWidth))// 从右下开始
currentContext?.addArc(tangent1End: CGPoint.init(x: width - borderWidth, y: height - borderWidth), tangent2End: CGPoint.init(x: width - cornerRadii - borderWidth, y: height - borderWidth), radius: cornerRadii)
currentContext?.addArc(tangent1End: CGPoint.init(x: borderWidth, y: height - borderWidth), tangent2End: CGPoint.init(x: borderWidth, y: height - cornerRadii - borderWidth), radius: cornerRadii)
currentContext?.addArc(tangent1End: CGPoint.init(x: borderWidth, y: borderWidth), tangent2End: CGPoint.init(x: width - borderWidth, y: borderWidth), radius: cornerRadii)
currentContext?.addArc(tangent1End: CGPoint.init(x: width - borderWidth, y: borderWidth), tangent2End: CGPoint.init(x: width - borderWidth, y: cornerRadii + borderWidth), radius: cornerRadii)
} else {
currentContext?.move(to: CGPoint.init(x: cornerRadii + borderWidth, y: borderWidth))// 从左上开始
if direction.contains(UIRectCorner.topLeft) {
currentContext?.addArc(tangent1End: CGPoint.init(x: borderWidth, y: borderWidth), tangent2End: CGPoint.init(x: borderWidth, y: cornerRadii + borderWidth), radius: cornerRadii)
} else {
currentContext?.addLine(to: CGPoint.init(x: borderWidth, y: borderWidth))
}
if direction.contains(UIRectCorner.bottomLeft) {
currentContext?.addArc(tangent1End: CGPoint.init(x: borderWidth, y: height - borderWidth), tangent2End: CGPoint.init(x: borderWidth + cornerRadii, y: height - borderWidth), radius: cornerRadii)
} else {
currentContext?.addLine(to: CGPoint.init(x: borderWidth, y: height - borderWidth))
}
if direction.contains(UIRectCorner.bottomRight) {
currentContext?.addArc(tangent1End: CGPoint.init(x: width - borderWidth, y: height - borderWidth), tangent2End: CGPoint.init(x: width - borderWidth, y: height - borderWidth - cornerRadii), radius: cornerRadii)
} else {
currentContext?.addLine(to: CGPoint.init(x: width - borderWidth, y: height - borderWidth))
}
if direction.contains(UIRectCorner.topRight) {
currentContext?.addArc(tangent1End: CGPoint.init(x: width - borderWidth, y: borderWidth), tangent2End: CGPoint.init(x: width - borderWidth - cornerRadii, y: borderWidth), radius: cornerRadii)
} else {
currentContext?.addLine(to: CGPoint.init(x: width - borderWidth, y: borderWidth))
}
currentContext?.addLine(to: CGPoint.init(x: borderWidth + cornerRadii, y: borderWidth))
}
currentContext?.drawPath(using: .fillStroke)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
// 绘制完成后，将UIImageView插入到view视图层级的底部
if (image?.isKind(of: UIImage.self))! {
let baseImageView = UIImageView.init(image: image)
view.insertSubview(baseImageView, at: 0)
}
}
} else {// 如果没有获取到view的bounds时
DispatchQueue.main.async {
self.cuttingView(view: view, direction: direction, cornerRadii: cornerRadii, borderWidth: borderWidth, borderColor: borderColor, backgroundColor: backgroundColor)
}
}
}
/** 切割UIImageView圆角
* @param imageView 需要进行切割的对象
* @param direction 切割的方向
* @param cornerRadii 圆角半径
* @param borderWidth 边框宽度
* @param borderColor 边框颜色
* @param backgroundColor 背景色
*/
public class func cuttingImageView(imageView: UIImageView, direction: UIRectCorner, cornerRadii: CGFloat, borderWidth: CGFloat, borderColor: UIColor, backgroundColor: UIColor)
{
var cornerRadii = cornerRadii
if imageView.bounds.size.height != 0 && imageView.bounds.size.width != 0 {
// 先截取UIImageView视图Layer生成的Image，然后再做渲染
var image : UIImage? = nil
if (imageView.image != nil) {
image = imageView.image
} else {
DispatchQueue.main.async {
self.cuttingImageView(imageView: imageView, direction: direction, cornerRadii: cornerRadii, borderWidth: borderWidth, borderColor: borderColor, backgroundColor: backgroundColor)
}
}
if cornerRadii == 0 {
cornerRadii = imageView.bounds.size.height / 2
}
let rect = CGRect.init(origin: CGPoint.init(x: 0, y: 0), size: CGSize.init(width: imageView.bounds.size.width, height: imageView.bounds.size.height))
UIGraphicsBeginImageContextWithOptions(rect.size, false, UIScreen.main.scale)
let currentContext = UIGraphicsGetCurrentContext()
if (currentContext != nil) {
let path = UIBezierPath.init(roundedRect: rect, byRoundingCorners: direction, cornerRadii: CGSize.init(width: cornerRadii - borderWidth, height: cornerRadii - borderWidth))
currentContext?.addPath(path.cgPath)
currentContext?.clip()
image?.draw(in: rect)
borderColor.setStroke()// 画笔颜色
backgroundColor.setFill()// 填充颜色
path.stroke()
path.fill()
image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
}
if (image?.isKind(of: UIImage.self))! {
imageView.image = image
} else {// UITableViewCell的UIImageView，第一次创建赋图时，可能无法获取UIImageView视图layer的图片
DispatchQueue.main.async {
self.cuttingImageView(imageView: imageView, direction: direction, cornerRadii: cornerRadii, borderWidth: borderWidth, borderColor: borderColor, backgroundColor: backgroundColor)
}
}
} else {
DispatchQueue.main.async {
self.cuttingImageView(imageView: imageView, direction: direction, cornerRadii: cornerRadii, borderWidth: borderWidth, borderColor: borderColor, backgroundColor: backgroundColor)
}
}
}
}
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