我试图截取网页的屏幕截图,但图像始终为空白(白色)。
我正在使用此代码进行转换CALayer
to Data
(取自这里) https://stackoverflow.com/a/41387514/4859791
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: NSBitmapImageFileType = .PNG, properties: [String : Any] = [:]) -> Data {
let width = Int(bounds.width * self.contentsScale)
let height = Int(bounds.height * self.contentsScale)
let imageRepresentation = NSBitmapImageRep(bitmapDataPlanes: nil, pixelsWide: width, pixelsHigh: height, bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false, colorSpaceName: NSDeviceRGBColorSpace, bytesPerRow: 0, bitsPerPixel: 0)!
imageRepresentation.size = bounds.size
let context = NSGraphicsContext(bitmapImageRep: imageRepresentation)!
render(in: context.cgContext)
return imageRepresentation.representation(using: fileType, properties: properties)!
}
}
然后将数据写入文件.png
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!)
{
let d = web.layer?.data() as NSData? //web is the instance of WKWebView
d!.write(toFile: "/Users/mac/Desktop/web.png", atomically: true)
}
但我得到的是一个空白(白色)png,而不是我期望的
1)。我究竟做错了什么?
2)。有没有其他可能的方法来获取图像表示
网页(使用 swift)?
谢谢你!