NSTimer timerWithTimeInterval: not working

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scheduledTimerWithTimeInterval:invocation:repeats: and scheduledTimerWithTimeInterval:target:selector:userInfo:repeats: create timers that get automatically added to an NSRunLoop, meaning that you don’t have to add them yourself. Having them added to an NSRunLoop is what causes them to fire.

With timerWithTimeInterval:invocation:repeats: and timerWithTimeInterval:target:selector:userInfo:repeats:, you have to add the timer to a run loop manually, with code like this:

[[NSRunLoop mainRunLoop] addTimer:repeatingTimer forMode:NSDefaultRunLoopMode];

Other answers on here suggest that you need to call fire yourself. You don’t – it will be called as soon as the timer has been put on a run loop.

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