UIWebview：如果Web视图中任何已加载的链接无法打开，如何通知UIViewController

Question

I have a UIWebView controller in which I am loading one Web Application . If any of the link inside the web app fails to open, I just need to notify the UIViewController that the particular link fails to open and accordingly I need to show the alert box. Can you guys please guide me in this ?? Any help will be appreciated. Thanks in advance.

Answer 1

您可以使用以下UIWebView委托方法

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error

Answer 2

In your view controller write this

In viewdidload

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(receivefailedNotification:)
                                             name:@"failedNotification"
                                           object:nil];


- (void) receivefailedNotification:(NSNotification *) notification // this will trig automatically once we provide info to it in webviewcontroller
{
 NSDictionary *userInfo = notification.userInfo;
}

In webviewcontroller

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
NSLog(@"erroe");
   NSDictionary *userInfo = [NSDictionary dictionaryWithObject: erroe forKey:@"OauthoKey"];

[[NSNotificationCenter defaultCenter] postNotificationName:@"failedNotification"
 object:self userInfo:userInfo];
}

Answer 3

Usually Apple have delegates implemented for all of that: UIWebViewDelegate

You can use:

webView:didFailLoadWithError: Sent if a web view failed to load a frame.

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error

Parameters

• webView : The web view that failed to load a frame.
• error : The error that occurred during loading.

Availability : Available in iOS 2.0 and later.

Remember, you should:

yourWebView.delegate = self

and

.h

@interface ViewController : UIViewController <UIWebViewDelegate>

or .m

@interface ViewController () <UIWebViewDelegate>

Answer 4

Called when UIWebview failed to load request

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error

you can get link that failed from UIWebview as follows:

In this method, use this code to get url that failed.

NSString *strFailedUrl = UIWebviewObj.request.url.absoluteString;

notify your UiviewController accordingly or show alert