func initTimePicker() {
timePickerView.minimumDate = Date()
timePickerView.setDate(Date(), animated:true)//一定要设置初始值,否则 valueChanged 第一次 不响应方法
timePickerView.addTarget(self, action: #selector(updateBeginTimeAndInvalidTime), for: UIControlEvents.valueChanged)
timePickerView.tintColor = UIColor.white
timePickerView.setValue(UIColor.white, forKey: "textColor") //改变颜色
}