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swift - 从 CALayer 或 NSView 获取图像(swift 3)

转载 作者:行者123 更新时间:2023-12-03 16:04:29 27 4
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我正在寻找一种渲染 CALayer 或 NSView 并获取 NSImage 的方法。

我有一个自定义类,它是 NSView 的子类。一开始我只是做了一个渐变层来覆盖NSView。

class ContentView: NSView {

override func draw(_ dirtyRect: NSRect) {
fillGradientLayer()
}

func fillGradientLayer() {
gradientLayer = CAGradientLayer()
gradientLayer.colors = [#colorLiteral(red: 0, green: 0.9909763549, blue: 0.7570167824, alpha: 1),#colorLiteral(red: 0, green: 0.4772562545, blue: 1, alpha: 1)].map({return $0.cgColor})
gradientLayer.startPoint = CGPoint(x: 0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 1, y: 0.5)
gradientLayer.frame = self.frame.insetBy(dx: margin, dy: margin)
gradientLayer.zPosition = 2
gradientLayer.name = "gradientLayer"
gradientLayer.contentsScale = (NSScreen.main()?.backingScaleFactor)!
self.layer?.addSublayer(gradientLayer)
}
}

有时我想从CALayer获取一个NSImage(或CGImage)。我在网上找到了一些示例并将它们变成了这样:

extension CALayer {

func getBitmapImage() -> NSImage {

let btmpImgRep = NSBitmapImageRep(bitmapDataPlanes: nil, pixelsWide: Int(self.frame.width), pixelsHigh: Int(self.frame.height), bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false, colorSpaceName: NSDeviceRGBColorSpace, bytesPerRow: 0, bitsPerPixel: 0)

let image: NSImage = NSImage(size: self.frame.size)
image.lockFocus()
let ctx = NSGraphicsContext(bitmapImageRep: btmpImgRep!)
let cgCtxt = ctx!.cgContext

self.render(in: cgCtxt)
cgCtxt.draw(layer: CGLayer, in: CGRect)

image.unlockFocus()
return image
}
}

第一个问题是 draw(layer: CGLayer, in: CGRect) 方法需要 CGLayer,而不是 CALayer。

其次,我不知道我最终得到的代码是否会最终渲染我的图层,或者我做错了什么。

感谢您的帮助。

<小时/>

编辑:从 CALayer 获取 CGImage 的解决方案。

extension CALayer {

func getBitmapImage() -> NSImage {

let btmpImgRep =
NSBitmapImageRep(bitmapDataPlanes: nil, pixelsWide: Int(self.frame.width), pixelsHigh: Int(self.frame.height), bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false, colorSpaceName: NSDeviceRGBColorSpace, bytesPerRow: 0, bitsPerPixel: 32)

let ctx = NSGraphicsContext(bitmapImageRep: btmpImgRep!)
let cgContext = ctx!.cgContext

self.render(in: cgContext)

let cgImage = cgContext.makeImage()

let nsimage = NSImage(cgImage: cgImage!, size: CGSize(width: self.frame.width, height: self.frame.height))

return nsimage
}
}

如何从 NSView 获取 NSImage 在下面的答案中。

P.S.我对 NSBitmapImageRep 属性了解不多,所以这部分可能是错误的。

最佳答案

以下是一些 NSView 选项:

extension NSView {

/// Get `NSImage` representation of the view.
///
/// - Returns: `NSImage` of view

func image() -> NSImage {
let imageRepresentation = bitmapImageRepForCachingDisplay(in: bounds)!
cacheDisplay(in: bounds, to: imageRepresentation)
return NSImage(cgImage: imageRepresentation.cgImage!, size: bounds.size)
}
}

或者

extension NSView {

/// Get `Data` representation of the view.
///
/// - Parameters:
/// - fileType: The format of file. Defaults to PNG.
/// - properties: A dictionary that contains key-value pairs specifying image properties.
/// - Returns: `Data` for image.

func data(using fileType: NSBitmapImageRep.FileType = .png, properties: [NSBitmapImageRep.PropertyKey: Any] = [:]) -> Data {
let imageRepresentation = bitmapImageRepForCachingDisplay(in: bounds)!
cacheDisplay(in: bounds, to: imageRepresentation)
return imageRepresentation.representation(using: fileType, properties: properties)!
}
}
<小时/>

一些 CALayer 选项:

extension CALayer {

/// Get `NSImage` representation of the layer.
///
/// - Returns: `NSImage` of the layer.

func image() -> NSImage {
let width = Int(bounds.width * contentsScale)
let height = Int(bounds.height * contentsScale)
let imageRepresentation = NSBitmapImageRep(bitmapDataPlanes: nil, pixelsWide: width, pixelsHigh: height, bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false, colorSpaceName: .deviceRGB, bytesPerRow: 0, bitsPerPixel: 0)!
imageRepresentation.size = bounds.size

let context = NSGraphicsContext(bitmapImageRep: imageRepresentation)!

render(in: context.cgContext)

return NSImage(cgImage: imageRepresentation.cgImage!, size: bounds.size)
}
}

或者

extension CALayer {

/// Get `Data` representation of the layer.
///
/// - Parameters:
/// - fileType: The format of file. Defaults to PNG.
/// - properties: A dictionary that contains key-value pairs specifying image properties.
///
/// - Returns: `Data` for image.

func data(using fileType: NSBitmapImageRep.FileType = .png, properties: [NSBitmapImageRep.PropertyKey: Any] = [:]) -> Data {
let width = Int(bounds.width * contentsScale)
let height = Int(bounds.height * contentsScale)
let imageRepresentation = NSBitmapImageRep(bitmapDataPlanes: nil, pixelsWide: width, pixelsHigh: height, bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false, colorSpaceName: .deviceRGB, bytesPerRow: 0, bitsPerPixel: 0)!
imageRepresentation.size = bounds.size

let context = NSGraphicsContext(bitmapImageRep: imageRepresentation)!

render(in: context.cgContext)

return imageRepresentation.representation(using: fileType, properties: properties)!
}
}

关于swift - 从 CALayer 或 NSView 获取图像(swift 3),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41386423/

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