ios – 如何在Swift中以编程方式从另一个图像中剪切徽标的形状(png图像)？

概述这是背景图片 这是徽标 我们如何在Swift中制作这样的图像？ 更新 现在我设法使用徽标作为面具并得到这样的东西, 有没有办法扭转面具？ 这是我的代码 let logo = UIImage(named: "logo")!let mask = CALayer()mask.contents = logo.CGImagemask.frame = mImageView.layer.boundsmI 这是背景图片

这是徽标

我们如何在Swift中制作这样的图像？

更新

现在我设法使用徽标作为面具并得到这样的东西,

有没有办法扭转面具？

这是我的代码

let logo = UIImage(named: "logo")!let mask = CALayer()mask.contents = logo.CGImagemask.frame = mImageVIEw.layer.boundsmImageVIEw.layer.mask = mask

解决方法 您可以使用UIBezIErPath以编程方式执行此 *** 作：

// lets create a vIEw and an image for testinglet picture = UIImage(data: try! Data(contentsOf: URL(string: "http://i.stack.imgur.com/Xs4RX.jpg")!))!// lets create a vIEw and an image for testinglet imageVIEw = UIImageVIEw(frame: CGRect(x: 0,y: 0,wIDth: picture.size.wIDth,height: picture.size.height))imageVIEw.image = picture// Now a layer for the masklet maskLayer = CAShapeLayer()// a path for the logolet maskPath = CGMutablePath()// create your logo path (I've added this circle to represent your logo path)maskPath.addEllipse(in: CGRect(x: imageVIEw.frame.mIDX - 150,y: imageVIEw.frame.mIDY - 150,wIDth: 300,height: 300))// you will need a rectangle that covers the whole image area to intersect with your logo pathmaskPath.addRect(CGRect(x: 0,height: picture.size.height))// add the mask to your maskLayermaskLayer.path = maskPath// choose the fill rule EvenOddmaskLayer.fillRule = kCAFillRuleEvenOdd// add your masklayer to your vIEwimageVIEw.layer.mask = maskLayerimageVIEw

如果您需要使用图像并以编程方式反转徽标的Alpha,则可以使用kCGBlendModeDestinationOut执行以下 *** 作：

import UIKitextension UIImage {    func masked(with image: UIImage,position: CGPoint? = nil,inverted: Bool = false) -> UIImage? {        let position = position ??            CGPoint(x: size.wIDth.half - image.size.wIDth.half,y: size.height.half - image.size.height.half)        defer { UIGraphicsEndImageContext() }        UIGraphicsBeginImageContextWithOptions(size,false,scale)        draw(at: .zero)        image.draw(at: position,blendMode: inverted ? .destinationOut : .destinationIn,Alpha: 1)        return UIGraphicsGetimageFromCurrentimageContext()    }}

let picture = UIImage(data: try! Data(contentsOf: URL(string: "http://i.stack.imgur.com/Xs4RX.jpg")!))!let logo = UIImage(data: try! Data(contentsOf: URL(string: "https://www.dropBox.com/s/k7vk3xvcvcly1ik/chat_bubble.png?dl=1")!))!let vIEw = UIVIEw(frame: UIScreen.main.bounds)vIEw.backgroundcolor = .bluelet iv = UIImageVIEw(frame: UIScreen.main.bounds)iv.contentMode = .scaleAspectFilliv.image = picture.masked(with: logo,inverted: true)vIEw.addSubvIEw(iv)

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