IOS implements its own web browser (canGoBack), ioscangoback

IOS implements its own web browser (canGoBack), ioscangoback
Create a UIWebView, define the forward, backward, and refresh buttons, and implement the UIWebViewDelegate method.
 
1. Back button event
 
-(IBAction) WebViewBack :( id) sender
 
{
 
If ([self. webview canGoBack]) {
 
[Self. webview goBack];
 
}
 
}
 
2. forward button event
 
-(IBAction) WebViewForward :( id) sender
 
{
 
If ([self. webview canGoForward])
 
[Self. webview goForward];
 
}
 
3. Refresh events
 
-(IBAction) WebViewRefresh :( id) sender
 
{
 
[Self. webview reload];
 
}
 
4. UIWebViewDelegate proxy method webViewDidFinishLoad
 
-(Void) webViewDidFinishLoad :( UIWebView *) webView1
 
{
 
NSString * title = [webView1 stringByEvaluatingJavaScriptFromString: @ "document. title"];
 
_ WebviewTitleLabel. text = title;
 
 
If (! [WebView1 canGoBack])
 
{
 
_ BtnWebviewGoBack. enabled = NO;
 
}
 
Else
 
{
 
_ BtnWebviewGoBack. enabled = YES;
 
}
 

 
If (! [WebView1 canGoForward])
 
{
 
_ BtnWebviewGoForward. enabled = NO;
 
}
 
Else
 
{
 
_ BtnWebviewGoForward. enabled = YES;
 
} // Determine whether forward or backward can be performed after webView is loaded to determine whether the backward key and forward key are available.
 
[_ Indicator stopRotateAnimation]; // stop rotating and refreshing the image
 
[_ LoadingView stopAnimating_LoadingView]; // stop the rotation of LoadingView
 
}
 
5. UIWebViewDelegate proxy method webViewDidStartLoad
 
-(Void) webViewDidStartLoad :( UIWebView *) webView
 
{
 
[_ Indicator startAnimating]; // starts rotating the refreshed image
 
[_ LoadingView startAnimating_LoadingView]; // starts the rotation of LoadingView
 
}