let checkmark: ASIACheckmarkView

func changeState() {
        let newValue = !checkmark.boolValue // boolValue describes current checkmark state
        checkmark.animate(checked: newValue) // animate to state you want
}

func changeStateWithCompletion() {
        let newValue = !checkmark.boolValue // boolValue describes current checkmark state
        checkmark.animateTo(newValue){
            print("changed state to \(checkmark.boolValue)")
        }
}

@IBAction func changeStateWithSpinner() {
        let newValue = !checkmark.boolValue
        checkmark.animate(checked: newValue)    // animate to state you want
        checkmark.isSpinning = true       // PLACE THIS AFTER ANIMATE TO CALL!
}

func endSpinning() {
        // OPTIONAL - You might call "checkmark.animate(checked: some_value)" here
        // - if you want to alter state after finishing spinning
        // (Yes -> spinning -> Yes) for example
        checkmark.isSpinning = false
}