在 WKWebView 中加载本地文件在设备中不起作用

Posted 2023-02-23

【中文标题】在 WKWebView 中加载本地文件在设备中不起作用

【英文标题】：Loading local file in WKWebView doesn't working in device

【发布时间】：2016-01-05 04:50:01

【问题描述】：

我无法在 wkwebview 中加载本地 epub 文件（从文档目录）。它在模拟器中工作，但不在设备中。我从here 了解到这是 ios 8 的错误。 iOS 8 已经解决了吗？请帮助我该怎么办。我在设备中遇到错误 -

The operation couldn't be completed. (KCFErrorDomainCFNetwork error 1.)

这里是代码 sn-p -

-(void)viewWillDisappear:(BOOL)animated 
    [super viewWillDisappear:animated];

    [self.webView removeObserver:self forKeyPath:@"loading"];
    [self.webView removeObserver:self forKeyPath:@"estimatedProgress"];



-(void)viewWillAppear:(BOOL)animated 
    [super viewWillAppear:animated];

    [self.webView addObserver:self forKeyPath:@"loading" options:NSKeyValueObservingOptionNew context:nil];
    [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];
    [self.progressView setProgress:0.0f animated:NO];

    if ([self.documentDirectory checkEpubFileIfExistsAtPath:self.epubFolder]) 

        NSString *filePath = [NSString stringWithFormat:@"%@/%@/%@/OEBPS/%@", [self.documentDirectory getDocumentsDirectory], self.epubFolder, self.epubName, [_html_link substringToIndex:[_html_link rangeOfString:@"#"].location]];

        //Loading webview with progress bar action
        if ([_html_link rangeOfString:@"#"].location != NSNotFound) 

            self.tag = [_html_link substringFromIndex:[_html_link rangeOfString:@"#"].location];
            NSURL *URL = [NSURL fileURLWithPath:filePath];
            NSURLRequest *request = [NSURLRequest requestWithURL:URL];
            [self.webView loadRequest:request];
        

     else 

        NSDictionary *object = [self.alertMessages getMessageObj:@"translationNotAvailable"];
        [self presentViewController:[self.alertController alertWithCustomOkayAction:[object objectForKey:@"title"] message:[object objectForKey:@"msg"] callback:^(void) 

            [self dismissViewControllerAnimated:YES completion:nil];

        ] animated:YES completion:nil];
    


//Constraints for Web View
- (void) setConstraintsForWebView 
    [self.webView setTranslatesAutoresizingMaskIntoConstraints:NO];

    WKWebView *webView = self.webView;
    UIProgressView *progressView = self.progressView;
    UIToolbar *toolBar = self.toolBar;

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-8-[webView]-8-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(webView)]];

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[progressView]-0-[webView]-[toolBar]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(progressView, webView, toolBar)]];


- (void)viewDidLoad 
    [super viewDidLoad];

    //Do any additional setup after loading the view.
    self.alertController = [AlertController new];
    self.alertMessages = [AlertMessages new];
    self.documentDirectory = [DocumentDirectory new];
    self.languageController = [LanguageController new];

    //Set observer for webview load
    self.webView = [[WKWebView alloc] initWithFrame:CGRectZero];
    self.webView.navigationDelegate = self;
    [self.view insertSubview:self.webView belowSubview:self.progressView];
    [self setConstraintsForWebView];



#pragma mark KVO

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context 
    if ([keyPath isEqualToString:@"loading"]) 
        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:self.webView.loading];
     else if ([keyPath isEqualToString:@"estimatedProgress"]) 
        self.progressView.hidden = self.webView.estimatedProgress == 1;
        self.progressView.progress = self.webView.estimatedProgress;
    



#pragma mark Web view navigation delegate

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation 
    [self.progressView setProgress:0.0f animated:NO];
    if (self.tag) 
        [self.webView evaluatejavascript:[NSString stringWithFormat:@"window.location.hash='%@'", self.tag] completionHandler:nil];
    


- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error 

    [self presentViewController:[self.alertController alertWithAction:@"Error!" message:error.localizedDescription] animated:YES completion:nil];

【参考方案1】：

一年多后我找到了解决方案，我们需要使用 loadFileURL 来访问本地资源，这是我使用 WKWebView 的工作代码，加上我使用 loadHTMLString 而不是加载。 vistaweb 在我的 WebView 顺便说一句

感谢这个答案：Load local web files & resources in WKWebView

对不起，但在 Swift 中

        do 

            let local = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true)[0]
            // Loading: Library/Caches/repositorioLocal/esferas/znvUifZhH8mIDr09cX8j/index.html
            let resourceFolder = "repositorioLocal/esferas/znvUifZhH8mIDr09cX8j"
            let fileToLoad = "index.html"

            let urlToFolder = URL(fileURLWithPath: local).appendingPathComponent(resourceFolder)
            let urlToFile =  URL(fileURLWithPath: local).appendingPathComponent(resourceFolder).appendingPathComponent(fileToLoad)
            let fileContent = try String(contentsOf: urlToFile)

            let webConfiguration = WKWebViewConfiguration()
            webConfiguration.preferences.setValue(true, forKey: "allowFileAccessFromFileURLs")
            webConfiguration.allowsInlineMediaPlayback = true

            vistaweb = WKWebView(frame: self.view.frame, configuration: webConfiguration)
            self.vistaweb.loadFileURL(urlToFolder, allowingReadAccessTo: urlToFolder)
            self.vistaweb.loadHTMLString(fileContent, baseURL: urlToFile)
            self.view.addSubview(vistaweb)

         catch let error 
            print("Error: \(error.localizedDescription)")