- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    __weak APWebViewController* wself = self;
    NSString * reqUrl = navigationAction.request.URL.absoluteString;
    if ([reqUrl hasPrefix:@"alipays://"] || [reqUrl hasPrefix:@"alipay://"]) {
        // NOTE: 跳转支付宝App
        BOOL bSucc = [[UIApplication sharedApplication]openURL:navigationAction.request.URL];
        // NOTE: 如果跳转失败，则跳转itune下载支付宝App
        if (!bSucc) {
            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示"
                                                           message:@"未检测到支付宝客户端，请安装后重试。"
                                                          delegate:wself
                                                 cancelButtonTitle:@"立即安装"
                                                 otherButtonTitles:nil];
            [alert show];
        }
        decisionHandler(WKNavigationActionPolicyCancel);
        return;
    }
    decisionHandler(WKNavigationActionPolicyAllow);
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    // NOTE: 跳转itune下载支付宝App
    NSString* urlStr = @"https://itunes.apple.com/cn/app/zhi-fu-bao-qian-bao-yu-e-bao/id333206289?mt=8";
    NSURL *downloadUrl = [NSURL URLWithString:urlStr];
    [[UIApplication sharedApplication]openURL:downloadUrl];
}

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    // NOTE: ------  对alipays:相关的scheme处理 -------
    // NOTE: 若遇到支付宝相关scheme，则跳转到本地支付宝App
    NSString* reqUrl = request.URL.absoluteString;
    if ([reqUrl hasPrefix:@"alipays://"] || [reqUrl hasPrefix:@"alipay://"]) {
        // NOTE: 跳转支付宝App
        BOOL bSucc = [[UIApplication sharedApplication]openURL:request.URL];
        // NOTE: 如果跳转失败，则跳转itune下载支付宝App
        if (!bSucc) {
            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示"
                                                           message:@"未检测到支付宝客户端，请安装后重试。"
                                                          delegate:self
                                                 cancelButtonTitle:@"立即安装"
                                                 otherButtonTitles:nil];
            [alert show];
        }
        return NO;
    }
    return YES;
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    // NOTE: 跳转itune下载支付宝App
    NSString* urlStr = @"https://itunes.apple.com/cn/app/zhi-fu-bao-qian-bao-yu-e-bao/id333206289?mt=8";
    NSURL *downloadUrl = [NSURL URLWithString:urlStr];
    [[UIApplication sharedApplication]openURL:downloadUrl];
}

public boolean shouldOverrideUrlLoading(final WebView view, String url) {
   // 获取上下文, H5PayDemoActivity为当前页面
   final Activity context = H5PayDemoActivity.this;
   // ------  对alipays:相关的scheme处理 -------
   if(url.startsWith("alipays:") || url.startsWith("alipay")) {
    try {
     context.startActivity(new Intent("android.intent.action.VIEW", Uri.parse(url)));
    } catch (Exception e) {
     new AlertDialog.Builder(context)
     .setMessage("未检测到支付宝客户端，请安装后重试。")
     .setPositiveButton("立即安装", new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
       Uri alipayUrl = Uri.parse("https://d.alipay.com");
       context.startActivity(new Intent("android.intent.action.VIEW", alipayUrl));
      }
     }).setNegativeButton("取消", null).show();
    }
    return true;
   }
   // ------- 处理结束 -------
   if (!(url.startsWith("http") || url.startsWith("https"))) {
    return true;
   }
   view.loadUrl(url);
   return true;
  }