How to update a UI label from a non UI thread in iOS

Question

I am new to iOS development, I have plain objective -c class \"MoneyTimer.m\" for running timer, from there i want to update the an UI label with the changing value of timer.

Answer 1

Your question doesn't give much info or detail so it is hard to know exactly what you need to do (e.g. if there is a "thread" issue at all, etc.).

At any rate, assuming your MoneyTimer instance has a reference to the current viewController you can use performSelectorOnMainThread.

//

- (void)performSelectorOnMainThread:(SEL)aSelector withObject:(id)arg waitUntilDone:(BOOL)wait;