Modify constraint programatically using SnapKit in Swift 3 to remove one UIView

Question

I'm modifying the constraint of UIView height consist of nameTextField and its superView inputContainerView using SnapKit. I arrange the height of nameTextField is equal to one-third of the inputContainerView's height. My purpose is to remove the nameTextField when SegmentedControl is pressed. When I try to modify the constant, it worked perfectly. But when I try to modify the multiplier height value from (1/3) to 0, sometimes it crashed and sometimes the other textField that I wrote (passwordTextField and emailTextField) is vanished. I'm using updateContraint to update some of the constraint. How am I supposed to fix this? Thank you

inputContainerView.snp.makeConstraints { (make) in
        make.centerX.equalTo(view.snp.centerX)
        make.centerY.equalTo(view.snp.centerY)
        // constraintAnchor is equal to offset
        make.width.equalTo(view.snp.width).offset(-24)
        make.height.equalTo(150)
    }

    // constraint for nameTextField
    inputContainerView.addSubview(nameTextField)
    //x y width height constraint using Snap Kit
    nameTextField.snp.makeConstraints { (make) in
        make.left.equalTo(inputContainerView.snp.left).offset(12)
        make.top.equalTo(inputContainerView.snp.top)
        make.width.equalTo(inputContainerView.snp.width)
        make.height.equalTo(inputContainerView.snp.height).multipliedBy(0.333)
    }
func handleLoginRegisterChange() {
    let title = loginRegisterSegmentedControl.titleForSegment(at: loginRegisterSegmentedControl.selectedSegmentIndex)
    loginRegisterButton.setTitle(title, for: .normal)

    // change height of inputcontainerview
    if loginRegisterSegmentedControl.selectedSegmentIndex == 0 {
        inputContainerView.snp.updateConstraints({ (update) in
            update.height.equalTo(100)
        })
        nameTextField.snp.remakeConstraints({ (remake) in
            remake.height.equalTo(inputContainerView.snp.height).multipliedBy(0)
        })
    } else if loginRegisterSegmentedControl.selectedSegmentIndex == 1 {
        inputContainerView.snp.updateConstraints({ (update) in
            update.height.equalTo(150)
        })
        nameTextField.snp.remakeConstraints({ (remake) in
            remake.height.equalTo(inputContainerView.snp.height).multipliedBy(0.333)
        })
    }
}
// constraint for nameSeparator
    inputContainerView.addSubview(nameSeparator)
    //x y width height constraint using Snap Kit
    nameSeparator.snp.makeConstraints { (make) in
        make.left.equalTo(inputContainerView.snp.left).offset(12)
        make.top.equalTo(nameTextField.snp.bottom)
        make.right.equalTo(inputContainerView.snp.right).offset(-12)
        make.height.equalTo(1)
    }

    // constraint for emailTextField
    inputContainerView.addSubview(emailTextField)
    //x y width height constraint using Snap Kit
    emailTextField.snp.makeConstraints { (make) in
        make.left.equalTo(inputContainerView.snp.left).offset(12)
        make.top.equalTo(nameSeparator.snp.bottom)
        make.width.equalTo(inputContainerView.snp.width)
        make.height.equalTo(inputContainerView.snp.height).multipliedBy(0.333)
    }

    // constraint for emailSeparator
    inputContainerView.addSubview(emailSeparator)
    //x y width height constraint using Snap Kit
    emailSeparator.snp.makeConstraints { (make) in
        make.left.equalTo(inputContainerView.snp.left).offset(12)
        make.top.equalTo(emailTextField.snp.bottom)
        make.right.equalTo(inputContainerView.snp.right).offset(-12)
        make.height.equalTo(1)
    }

    // constraint for passwordTextField
    inputContainerView.addSubview(passwordTextField)
    passwordTextField.snp.makeConstraints { (make) in
        make.left.equalTo(inputContainerView.snp.left).offset(12)
        make.top.equalTo(emailSeparator.snp.bottom)
        make.width.equalTo(inputContainerView.snp.width)
        make.height.equalTo(inputContainerView.snp.height).multipliedBy(0.333)
    }

Here's the image are shown:

Answer 1

remakeConstraints will remove all previously installed constraints. So, you are probably removing all of the top, leading, and etc contraints and reinstalling just the height. You should use updateConstraints or do a remake with all of the declared constraints initially.