0.1 28 February, 2000 NSTimer Foundation/NSTimer.h NSObject scheduledTimerWithTimeInterval: seconds invocation: invocation scheduledTimerWithTimeInterval: seconds target: target selector: aSelector userInfo: userInfo repeats: repeats timerWithTimeInterval: seconds invocation: invocation timerWithTimeInterval: seconds target: target selector: aSelector userInfo: userInfo repeats: repeats fire fireDate invalidate isValid timeInterval userInfo