[ios] How can I use Timer (formerly NSTimer) in Swift?

If you init method of timer

let timer = Timer(timeInterval: 3, target: self, selector: #selector(update(_:)), userInfo: [key : value], repeats: false)

func update(_ timer : Timer) {

}

then add it to loop using method other selector will not be called

RunLoop.main.add(timer!, forMode: .defaultRunLoopMode)

NOTE : If you are want this to repeat make repeats true and keep the reference of timer otherwise update method will not be called.

If you are using this method.

Timer.scheduledTimer(timeInterval: seconds, target: self, selector: #selector(update(_:)), userInfo: nil, repeats: true)

keep a reference for later use if repeats is true.

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