我正在尝试制作在WKWebView中呈现的完整网页的屏幕截图:
let snapshotConfiguration = WKSnapshotConfiguration()
snapshotConfiguration.snapshotWidth = 1440
webView.takeSnapshot(with: snapshotConfiguration) { (image, error) in
UIImageWriteToSavedPhotosAlbum(image!, nil, nil, nil)
}
但方法takeSnapshot
只创建视口的屏幕截图。
如何制作完整网页的屏幕截图?
你需要将图像拼接在一起。您可以使用javascript获取Webview contentSize:
webView.evaluateJavaScript("document.body.scrollHeight", completionHandler: { [weak self] (height, error) in
self?.webViewContentHeight = (height as? CGFloat) ?? -1
})
您可以使用UIGraphicsImageRenderer创建该大小的图像上下文,然后在图像上下文中呈现Web视图的每个页面:
let image = UIGraphicsImageRenderer(size: CGSize(width: webview.bounds.size.width, height: webViewContentHeight)).image { [webview] context in
for offset in stride(from: 0, to: Int(webViewContentHeight), by: Int(webview.bounds.size.height)) {
let drawPoint = CGPoint(x: 0, y: CGFloat(offset))
webview.scrollView.contentOffset = drawPoint
webview.drawHierarchy(in: CGRect.init(origin: drawPoint, size: webview.bounds.size), afterScreenUpdates: true)
}
}