Sure.
Code:
NSTimer *repeatTimer;
...
repeatTimer = [[NSTimer scheduledTimerWithTimeInterval:0.5
target:self
selector:@selector(tick)
userInfo:nil
repeats:YES
] retain];
interval: Seconds, after which the timer will fire.
target: Who am I sending the method to?
selector: What method am I using?
userInfo: Additional info you may want to add.
repeats: After it fires, will it reset?