我想复合视图的从椭圆形形状减去矩形形状,
所以首先我创建了一个面具图像:
let paths = CGMutablePath()
//Oval shape path at left
let leftPath = CGPath(ellipseIn: CGRect(x: 0, y: 0, width: 200, height: 150), transform: nil)
//Rect shape path at right
let rightPath = CGPath(roundedRect: CGRect(x: 100, y: 100, width: 120, height: 100), cornerWidth: 8, cornerHeight: 8, transform: nil)
paths.addPath(leftPath)
paths.addPath(rightPath)
UIGraphicsBeginImageContext(CGSize(width: 220, height: 200))
let ctx = UIGraphicsGetCurrentContext()
ctx?.addPath(paths)
ctx?.clip(using: .evenOdd)
ctx?.addPath(leftPath.cgPath)
ctx?.clip(using: .evenOdd)
ctx?.setFillColor(UIColor.red.cgColor)
ctx?.fill(CGRect(x: 0, y: 0, width: 220, height: 200))
//the mask image
let maskImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
接下来我使用这个图像掩码:
let maskView = UIImageView(image: maskImage)
maskView.contentMode = .center
imageView.mask = maskView
运行应用程序,我得到这样的:
看起来不错?不是真的...
如果你仔细看,你会发现,在视图右下角细线
这不是为我行!
如何删除副业???谢谢 :)
绘制椭圆,然后清除圆角的矩形。
import UIKit
let ellipse = CGPath(ellipseIn: CGRect(x: 0, y: 0, width: 200, height: 150), transform: nil)
let roundedRect = CGPath(roundedRect: CGRect(x: 100, y: 100, width: 120, height: 100), cornerWidth: 8, cornerHeight: 8, transform: nil)
let maskImage = UIGraphicsImageRenderer(size: CGSize(width: 220, height: 200)).image { rendererContext in
let ctx = rendererContext.cgContext
ctx.setFillColor(UIColor.red.cgColor)
ctx.addPath(ellipse)
ctx.fillPath()
ctx.setBlendMode(.clear)
ctx.addPath(roundedRect)
ctx.fillPath()
}
结果: