问题描述
目标:将 CoreGraphics 大小调整函数从 iOS (UIImage) 重写为 MacOS (NSImage)
我做了什么:代码如下
问题:在这行代码上出错: 让 bytesPerPixel = cgImage.bitsPerPixel / bitsPerComponent
错误:
类型值 '(UnsafeMutablePointer?,NSGraphicsContext?,[NSImageRep.HintKey : Any]?) -> CGImage?' (aka '(Optional
问题:如何将“cgImage.bitsPerPixel”替换为适用于 NSImage 的内容?
iOS:UIImage
sqlALCHEMY_DATABASE_URI
MacOS:NSImage
extension UIImage {
// Resizeing using CoreGraphics
func resize(to size:CGSize) -> UIImage? {
let cgImage = self.cgImage!
let destWidth = Int(size.width)
let destHeight = Int(size.height)
let bitsPerComponent = 8
let bytesPerPixel = cgImage.bitsPerPixel / bitsPerComponent
let destBytesPerRow = destWidth * bytesPerPixel
let context = CGContext(data: nil,width: destWidth,height: destHeight,bitsPerComponent: bitsPerComponent,bytesPerRow: destBytesPerRow,space: cgImage.colorSpace!,bitmapInfo: cgImage.bitmapInfo.rawValue)!
context.interpolationQuality = .high
context.draw(cgImage,in: CGRect(origin: CGPoint.zero,size: size))
return context.makeImage().flatMap { UIImage(cgImage: $0) }
}
}
解决方法
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