How to get this into code form (if statement) - ios

Question

How to make this statement into an actual "if statement" in Xcode?
This is what i want in the form of an "if statement" :
"if a certain link is shown in UIWebView, then image.hidden = NO;"
The UIWebView is currently showing another website, but it has a page in that website that is the certain link I mentioned in the if statement.
The code for the UIWebView is this:
.h:
IBOutlet UIWebView *Name;
NSURL *NameURL;
.m
NameURL = [NSURL URLWithString:#"mywebname.com"];
NSURLRequest *Request = [NSURLRequest requestWithURL: NameURL];
[Name loadRequest: Request];

Answer 1

To access the actual page content within UIWebView, you need to use
stringByEvaluatingJavaScriptFromString: to invoke some JavaScript snippet. Once the page finishes loading, the idea is to loop through all a elements and check for its href attribute, comparing it to the 'certain site' that you mentioned.
Rough implementation:
JS Code
for (var i = 0; i < document.getElementsByTagName('a').length; i++)
{
if (document.getElementsByTagName('a')[i].href.match(/google/) return 'YES';
}
return 'NO';
Obj-C Code
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSString *test = [webView stringByEvaluatingJavaScriptFromString:aboveJSString];
if ([test isEqualToString:#"YES"]) image.hidden = NO;
}
Hope it helps.

Answer 2

According to Anh Do's answer stringByEvaluatingJavaScriptFromString isn't reliable for me.
Instead you should use:
currentURL = currentWebView.request.URL.absoluteString;
So the code will be like….
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSLog(#"HELLO DID GET CALLELDLLL LL LL LL ");
//get the url you webView called "Name" is displaying...
NSString *currentURL = Name.request.URL.absoluteString;
//Check if that url is "mywebname.com"
if ([currentURL isEqualToString:#"mywebname.com"])
{
image.hidden = NO;
}
}
PS. Don't for get to add delegate to you webview
By setting delegate do this..
In ViewDidLoad:
[Name setDelegate:self];
In .h file
#interface "nameofyourviewcontroller" : UIViewController<UIWebViewDelegate>