我在从 UIWebView 创建 PDF 时遇到问题。
let render = UIPrintPageRenderer();
/* 1. pdf from webView */
render.addPrintFormatter(webView.viewPrintFormatter(), startingAtPageAtIndex: 0);
// 2. Assign paperRect and printableRect
let page = CGRect(x: 0, y: 0, width: 595.2, height: 841.8) // A4, 72 dpi */
let printable = CGRectInset(page, 0, 0)
render.setValue(NSValue(CGRect: page), forKey: "paperRect")
render.setValue(NSValue(CGRect: printable), forKey: "printableRect")
// 3. Create PDF context and draw
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, CGRectZero, nil)
for i in 1...render.numberOfPages() {
UIGraphicsBeginPDFPage();
let bounds = UIGraphicsGetPDFContextBounds()
render.drawPageAtIndex(i - 1, inRect: bounds)
}
UIGraphicsEndPDFContext();
// 4. Save PDF file
print("open \(path)");
pdfData.writeToFile(path, atomically: true);
一切正常，但如果我在 HTML 中使用背景图片，它就会消失。有人知道怎么回事吗？
最佳答案
首先你需要创建你的html代码:
var html = "<html><head><meta charset='UTF-8'></head><body>hello from html </body></html>"
比您需要使用以下实例化您的 WebView :
let webView = UIWebView(frame: self.view.bounds)
self.view.addSubview(webView)
webView.delegate = self
webView.loadHTMLString(html, baseURL: nil)
// webView.isUserInteractionEnabled = true
之后，您需要让您的 ViewController 类实现 UIWebViewDelegate 并实现方法 func webViewDidFinishLoad(_ webView: UIWebView)
最后在 webViewDidFinishLoad 方法中添加以下代码
func webViewDidFinishLoad(_ webView: UIWebView) {
let render = UIPrintPageRenderer()
render.addPrintFormatter(webView.viewPrintFormatter(), startingAtPageAt: 0);
let page = CGRect(x: 0, y: 10, width: webView.frame.size.width, height: webView.frame.size.height) // take the size of the webView
let printable = page.insetBy(dx: 0, dy: 0)
render.setValue(NSValue(cgRect: page), forKey: "paperRect")
render.setValue(NSValue(cgRect: printable), forKey: "printableRect")
// 4. Create PDF context and draw
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, CGRect.zero, nil)
for i in 1...render.numberOfPages {
UIGraphicsBeginPDFPage();
let bounds = UIGraphicsGetPDFContextBounds()
render.drawPage(at: i - 1, in: bounds)
}
UIGraphicsEndPDFContext();
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
print(documentsPath)
pdfData.write(toFile: "\(documentsPath)/pdfName.pdf", atomically: true)
self.pdfPath = "\(documentsPath)/pdfName.pdf"
self.pdfTitle = "pdfName"
self.performSegue(withIdentifier: "showPDFSegue", sender: nil)
webView.removeFromSuperview()
self.loadingScreenViewController.view.removeFromSuperview()
}
所以恢复逻辑: 要从 webView 生成 pdf，您需要准备 html 代码，创建 WebView 并将 html 代码注入(inject) webView 并在 webView didFinishLoading 中使用与 webView 相同的宽度和高度打印 pdf 中的 html 内容。
关于swift - 从 UIWebView 创建 PDF，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39120144/