Timer in another thread in Objective - C

Question

I have to define method which should be invoked periodically with some time interval. I need to invoke it in another thread (NOT main thread), because this method is used to get

Answer 1

Use NSRunLoop and NSTimer for work

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timer) userInfo:nil repeats:NO];

[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];