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UISliderをタップで選択可能にする (iOS12以上の場合)

Last updated at 2019-12-26Posted at 2019-12-26

UISliderをタップで選択可能にするには

iOS12より前

class MySlider: UISlider {
    override func beginTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
        return true
    }
}

しかしiOS12以降だとSliderの値が変わらない

iOS12以降

class MySlider: UISlider {
    override func beginTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
        let tapPoint = touch.location(in: self)
        let fraction = Float(tapPoint.x / bounds.width)
        let newValue = (maximumValue - minimumValue) * fraction + minimumValue
        if newValue != value {
            value = newValue
        }
        return true
    }
}

これでiOS12以降でもタップで選択可能になり、.valueChangedイベントも送ってくれます

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