Question

I have a WebView that I need to ask to load a website from a different class.Therefore I implemented the following function:

-(void)performResearch:(NSString *)aString {  
    NSLog(@"Received Request!");  
    [[researcher mainFrame]
    loadRequest:[NSURLRequest
    requestWithURL:[NSURL URLWithString:aString]]]; 
}

In my other class, I call the function like this:

Researcher *res = [[Researcher alloc] init];
[res performResearch:@"http://www.twitter.com"];
[res release];

I get no compiler errors and the NSLog does indeed get called, however the WebView doesn’t load the webpage. No errors in the Log either.I’m puzzled.

Could anyone tell me what’s wrong?

Answer 1

You don’t show where researcher is declared, but it looks like a normal instance variable. Where does the value come from?

If it comes from outside the Researcher class, then it looks like it is nil because your other class is creating a new Researcher instance but not providing the researcher attribute.. If you pass messages to nil objects, the message is ignored. That is why you don’t get an error. Try breaking the load request line out into several lines and log the values of the objects.

EDIT:

Interface Builder sets the UIWebView attribute of one particular instance of the Researcher class. To update that web view, you need to call performResearch on the same instance. You cannot use a new instance because it won’t be connected to a web view at all.

If possible, you should pass the original Researcher object to the new class and use that instead:

[self.researcher performResearch:@"http://www.twitter.com"];