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在 webview 中打开 pdf
//第一步
webview.uiDelegate = self
//第 2 步 - 实现委托函数（此函数将让您在 webview 中打开任何点击的 pdf）
func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
// open in current view
webView.load(navigationAction.request)
// don't return a new view to build a popup into (the default behavior).
return nil;
}
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下载
在我的情况下，一旦我在 webview 中打开了 pdf，我就有了下载按钮，我用它来下载当前打开的 pdf
//第 3 步 - 委托函数
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
decisionHandler(WKNavigationActionPolicy.allow)
}
//find the mimeTime of the current url opened in webview, If it's pdf, we'll give option to download
func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {
if let mimeType = navigationResponse.response.mimeType {
//check if mime exists in our acceptable mimes list
if self.isMimeTypeConfigured(mimeType) {
self.mime = mimeType
self.currentUrl = navigationResponse.response.url
addDownloadButton()
}
}
decisionHandler(.allow)
}
//第 4 步 - 使用辅助函数创建扩展
//=== PDF downloading ===
struct MimeType {
var type:String
var fileExtension:String
}
extension DownloadManual {
//button
private func addDownloadButton(){
let btn = UIBarButtonItem(image: UIImage(systemName: "tray.and.arrow.down.fill"), style: .plain, target: nil, action: #selector(downloadTapped))
self.navigationItem.rightBarButtonItem = btn
}
@objc func downloadTapped(){
self.showActivityIndicator(show: true)
if let url = currentUrl {
print("download from: \(url)")
let filename = getDefaultFileName(forMimeType: self.mime)
downloadData(fromURL: url, fileName: filename) { success, destinationURL in
if success, let destinationURL = destinationURL {
self.showActivityIndicator(show: false)
print("download result: \(success), \(destinationURL)")
self.fileDownloadedAtURL(url: destinationURL)
}
}
}
}
//helper funcs
private func isMimeTypeConfigured(_ mimeType:String) -> Bool {
for record in self.mimeTypes {
if mimeType.contains(record.type) {
return true
}
}
return false
}
func fileDownloadedAtURL(url: URL) {
print("downloaded at: \(url)")
DispatchQueue.main.async {
let activityVC = UIActivityViewController(activityItems: [url], applicationActivities: nil)
activityVC.popoverPresentationController?.sourceView = self.view
activityVC.popoverPresentationController?.sourceRect = self.view.frame
activityVC.popoverPresentationController?.barButtonItem = self.navigationItem.rightBarButtonItem
self.present(activityVC, animated: true, completion: nil)
}
}
private func downloadData(fromURL url:URL,
fileName:String,
completion:@escaping (Bool, URL?) -> Void) {
webview.configuration.websiteDataStore.httpCookieStore.getAllCookies() { cookies in
let session = URLSession.shared
print("downloading ....")
session.configuration.httpCookieStorage?.setCookies(cookies, for: url, mainDocumentURL: nil)
let task = session.downloadTask(with: url) { localURL, urlResponse, error in
if let localURL = localURL {
let destinationURL = self.moveDownloadedFile(url: localURL, fileName: fileName)
completion(true, destinationURL)
}
else {
completion(false, nil)
}
}
task.resume()
}
}
private func getDefaultFileName(forMimeType mimeType:String) -> String {
for record in self.mimeTypes {
if mimeType.contains(record.type) {
return "default." + record.fileExtension
}
}
return "default"
}
private func moveDownloadedFile(url:URL, fileName:String) -> URL {
let tempDir = NSTemporaryDirectory()
let destinationPath = tempDir + fileName
let destinationURL = URL(fileURLWithPath: destinationPath)
try? FileManager.default.removeItem(at: destinationURL)
try? FileManager.default.moveItem(at: url, to: destinationURL)
return destinationURL
}
希望这对某人有帮助:)