Question

I have a NS Timer Firing within a web view load that looks for information on the page. I then do some manipulations to the page setting checkboxes etc which bring in some AJAX functions which as people may know does not fire the webviewloaded method. In short I would like to create a time that checks every 5 seconds to check to for a specific part that only occurs when the proper information is loaded. This is fine I can do this, but I don’t know how to stop the NSTIMER as all the examples here do not show a parameter being passed into the function.

currently I have

   [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(fcheckForEditFinished) userInfo:nil repeats:YES];

-(void) fcheckForEditFinished
{
//Would like to kill timer at this point. 
}

Thanks Kevin

Answer 1

The documentation of scheduledTimerWithTimeInterval:target:selector:userInfo:repeats: says this:

aSelector
The message to send to target when the timer fires. The
selector must have the following signature:
- (void)timerFireMethod:(NSTimer*)theTimer
The timer passes itself as the argument to this method.

And you can “kill” a timer by sending it the invalidate message. So change fcheckForEditFinished to fcheckForEditFinished: like this:

- (void)fcheckForEditFinished:(NSTimer *)timer
{
    if (checkForEdit()) {
        [timer invalidate];
    }
}

The timer will automatically pass itself as the parameter of fcheckForEditFinished:. Make sure you add the colon to the selector in your call to scheduledTimerWithTimeInterval:... too.