为UITextView提交帧位置更改

Question

我有一个UITextview，它低于2个UITextFields和一个UISwitch。

如果启用了UISwitch，我想删除2个UITextField并将UITextView向上移动。如果再次关闭UISwitch，那么我希望返回2个UITextField，并返回UITextView的原始位置。

我使用以下代码实现了这一目标。

func allDaySwitched() {
    if appointmentAllDayToggle.isOn {

        appointmentStartTimeTextfield.tag = 0
        appointmentStopTimeTextfield.tag = 0
        appointmentSummaryTextfield.tag = 4

        UIView.animate(withDuration: 0.3, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
            self.appointmentStartTimeLabel.alpha = 0
            self.appointmentStopTimeLabel.alpha = 0
            self.appointmentStartTimeTextfield.alpha = 0
            self.appointmentStopTimeTextfield.alpha = 0
        }, completion: { (true) in

            UIView.animate(withDuration: 0.3, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {

                self.appointmentSummaryTextfield.frame = CGRect(x: self.appointmentSummaryTextfield.frame.origin.x, y: self.appointmentSummaryTextfield.frame.origin.y - 50, width: self.appointmentSummaryTextfield.frame.width, height: self.appointmentSummaryTextfield.frame.height)


                self.appointmentSummaryLabel.frame = CGRect(x: self.appointmentSummaryLabel.frame.origin.x, y: self.appointmentSummaryLabel.frame.origin.y - 50, width: self.appointmentSummaryLabel.frame.width, height: self.appointmentSummaryLabel.frame.height)


            }, completion: { (true) in

            })

        })


    } else {
        appointmentStartTimeTextfield.tag = 4
        appointmentStopTimeTextfield.tag = 5
        appointmentSummaryTextfield.tag = 6


        UIView.animate(withDuration: 0.3, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {

            self.appointmentSummaryTextfield.frame = CGRect(x: self.appointmentSummaryTextfield.frame.origin.x, y: self.appointmentSummaryTextfield.frame.origin.y + 50, width: self.appointmentSummaryTextfield.frame.width, height: self.appointmentSummaryTextfield.frame.height)


            self.appointmentSummaryLabel.frame = CGRect(x: self.appointmentSummaryLabel.frame.origin.x, y: self.appointmentSummaryLabel.frame.origin.y + 50, width: self.appointmentSummaryLabel.frame.width, height: self.appointmentSummaryLabel.frame.height)

        }, completion: { (true) in

            UIView.animate(withDuration: 0.3, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {

                self.appointmentStartTimeLabel.alpha = 1
                self.appointmentStopTimeLabel.alpha = 1
                self.appointmentStartTimeTextfield.alpha = 1
                self.appointmentStopTimeTextfield.alpha = 1

            }, completion: { (true) in

            })

        })

    }
} 

这非常有效，但是，只要UITextView聚焦，它就会返回原始位置。从那里，如果我再次切换UISwitch，那么它会进一步向下移动。

如何提交此更改，以便在聚焦时UITextView不会移动？我试过了：

updateConstraints()
layoutIfNeeded()
setNeedsLayout()

在动画完成事件中，但它们都没有提交更改？

我怎样才能做到这一点？ - 我附上了行为截图

初始布局

切换时的布局（所需）

摘要字段聚焦时的布局（我已将照片中的字段重新排除以删除键盘） - 不需要

摘要字段聚焦后的布局，然后UISwitch被覆盖 - 不需要