Question

Is there any method (like – viewDidLoad) to continuously execute a part of code? I need to be able to check a value on a remote server continuously.

Answer 1

The way you would do this is to set up an NSTimer.

-(void)startCheckingValue
{
    mainTimer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(checkValue:) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:mainTimer forMode:NSDefaultRunLoopMode];
}

-(void)checkValue:(NSTimer *)mainTimer
{
    //Placeholder Function, this is where you write the code to check your value on the remote server
}

The timerWithTimeInterval function is the one that you are interested in, the main things that you need to pass it, as you see above, are the interval at which it will execute the function whose selector you pass it. The time interval is in seconds, so it is currently set to check every second, which is probably way too fast.