如何让UIKeyInput重复执行deleteBackwards调用

var timer: Timer?

func startDeleteBackwards() {
    timer?.invalidate()
    timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { [weak self] _ in
        self?.deleteBackwards()
    }
}

func stopDeleteBackwards() {
    timer?.invalidate()
    timer = nil
}

func deleteBackwards() {
    // 实现删除逻辑
}

startDeleteBackwards()

// 在适当的时机停止定时器
stopDeleteBackwards()