【ios】ios 對於wkwebview白屏問題

jaysun發表於2017-09-22
iOSWebView

The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.

問題

在根據《IOS開發指南 從helloworld到AppStore上架 第四版》學習的時候，看到第八章『樹形導航結構』使用WKWebView進行三級導航展示詳情，發現白屏

解決方案

WKWebView根據『WKNavigationDelegate』協議有幾個方法，可以追蹤載入進度


- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
    NSLog(@"準備載入頁面");
}

- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
    NSLog(@"開始載入頁面");
}

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    NSLog(@"已載入全部頁面");
}

- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error {
    NSLog(@"載入失敗1");
}

- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error {
    NSLog(@"載入失敗2%@",error.userInfo);
}

重新執行後，發現進入了didFailProvisionalNavigation方法，這個時候我們列印error.code得到值為-1022。

2017-09-22 11:08:40.096041+0800 treeNavigation[6176:2793155] http://baike.baidu.com/view/3961.htm
2017-09-22 11:08:40.171849+0800 treeNavigation[6176:2793155] 準備載入頁面
2017-09-22 11:08:40.184887+0800 treeNavigation[6176:2793155] 載入失敗2{
    NSErrorFailingURLKey = "http://baike.baidu.com/view/3961.htm";
    NSErrorFailingURLStringKey = "http://baike.baidu.com/view/3961.htm";
    NSLocalizedDescription = "The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.";
    NSUnderlyingError = "Error Domain=kCFErrorDomainCFNetwork Code=-1022 "(null)"";
    "_WKRecoveryAttempterErrorKey" = "<WKReloadFrameErrorRecoveryAttempter: 0x17403eae0>";
}

看到這裡基本上就能猜到https的問題了，然後我們將url進行一次搜尋替換，就可以了。

self.url = [self.url stringByReplacingOccurrencesOfString:@"http://" withString:@"https://"];

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