App中加载url出现403并不会在fail代理函数中调用，会走finish的函数回调，所以不能判断出加载的地址是否出现403错误
在代理函数中调用
funcwebView(_webView:WKWebView, decidePolicyFor navigationAction:WKNavigationAction, decisionHandler:@escaping(WKNavigationActionPolicy) ->Void) {
// 判断是否是网页跳转
if(navigationAction.request.url?.scheme?.hasPrefix("http"))!{
var response:URLResponse? =nil
// 请求该链接，通过返回的statusCode判断是否异常
let data =try?NSURLConnection.sendSynchronousRequest(navigationAction.request, returning: &response)
if((response as?HTTPURLResponse)?.statusCode == 200){
// 网页正常
decisionHandler(.allow)
}else{
// 网页异常
decisionHandler(.cancel)
}
}else{
decisionHandler(WKNavigationActionPolicy.cancel)
// 跳转到其他app
// debugPrint("scheme = \(String(describing: navigationAction.request.url))");
letscheme :URL= (navigationAction.request.url)!
if (UIApplication.shared.canOpenURL(scheme)){
UIApplication.shared.openURL(scheme)
}
}
}
