我希望将椭圆形减去矩形后的复合视图形状,
所以首先我创建一个遮罩图像:
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,我将此图像用作遮罩:
let maskView = UIImageView(image: maskImage)
maskView.contentMode = .center
imageView.mask = maskView
运行App,我明白了:
看起来不错?不是真的...
如果仔细看,您会在右下角看到一条细线
这对我来说不好!
如何删除边线???谢谢:)
答案 0 :(得分:0)
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: