Using Swift 3 Stopping a scheduledTimer, Timer continue firing even if timer is nil

Question

We call startTimer function to start a timer. When we wanted to stop it we call stopTimerTest function but after we called stopTimer function the timerTestAction keeps firing. T

Answer 1

Check, are you really call stopTimerTest(), because timerTest.invalidate() is correct for stopping timer.

func stopTimerTest() {
    print("stopTimer")
    timerTest.invalidate()
}