WKWebView默認禁止了一些跳轉

• UIWebView
  打開ituns.apple.com跳轉到appStore, 撥打電話, 喚起郵箱等一系列操作UIWebView默認支持的.
• WKWebView
  默認禁止了以上行為,除此之外,js端通過alert()`彈窗的動作也被禁掉了.
  如何支持呢?
• 首先要設置WKWebView的WKUIDelegate,并實現以下方法

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSURL *URL = navigationAction.request.URL;
    NSString *scheme = [URL scheme];
    UIApplication *app = [UIApplication sharedApplication];
    // 打電話
    if ([scheme isEqualToString:@"tel"]) {
        if ([app canOpenURL:URL]) {
            [app openURL:URL];
            // 一定要加上這句,否則會打開新頁面
            decisionHandler(WKNavigationActionPolicyCancel);
            return;
        } 
    }
    // 打開appstore
   if ([url.absoluteString containsString:@"ituns.apple.com"]) {
       if ([app canOpenURL:url]) {
          [app openURL:url];
          decisionHandler(WKNavigationActionPolicyCancel);
        return;
   }
decisionHandler(WKNavigationActionPolicyAllow);
}

支持alert()

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    // js 里面的alert實現，如果不實現，網頁的alert函數無效
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
                                                                             message:nil
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler();
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];

}

- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
    //  js 里面的alert實現，如果不實現，網頁的alert函數無效  ,
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
                                                                             message:nil
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler(YES);
                                                      }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action){
                                                          completionHandler(NO);
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
    
}