[swift] UIImage NSImage PNG透明区域填充自定义颜色实现

概述使用场合：魔方旋转控制按钮 https://github.com/zephyrluo/magic extension UIImage { public func maskWithColor(color: UIColor) -> UIImage { UIGraphicsBeginImageContextWithOptions(self.size, false

使用场合：魔方旋转控制按钮https://github.com/zephyrluo/magic

extension UIImage {    public func maskWithcolor(color: UIcolor) -> UIImage {                UIGraphicsBeginImageContextWithOptions(self.size,false,self.scale)        let context = UIGraphicsGetCurrentContext()!                let rect = CGRect(origin: CGPoint.zero,size: size)                color.setFill()                context.fill(rect)        context.setBlendMode(.copy)        self.draw(in: rect)                let resultimage = UIGraphicsGetimageFromCurrentimageContext()!        UIGraphicsEndImageContext()        return resultimage    }}

extension NSImage {    convenIEnce init(color: NScolor,img: NSImage,size: NSSize) {        self.init(size: size)        lockFocus()        color.drawSwatch(in: NSRect(origin: .zero,size: size))        img.draw(in: NSRect(origin: .zero,size: size),from: NSRect(origin: .zero,size: img.size),operation: NSCompositeSourceOver,fraction: 1)        unlockFocus()    }}

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