UITextField内部UIStackView间距宽度约束问题

Question

我有一个垂直的UIStackView，里面有各种各样的UITextFields（现在它只有4个）。当我给UIStackView留出间距时，我给出了以下错误;

"<NSLayoutConstraint:0x1c4286720 H:|-(0)-[UIStackView:0x104d3e6f0](LTR)   (active, names: '|':Hello.OtpInputView:0x104d3c5b0 )>",
"<NSLayoutConstraint:0x1c4286770 UIStackView:0x104d3e6f0.right == Hello.OtpInputView:0x104d3c5b0.right   (active)>",
"<NSLayoutConstraint:0x1c4286860 '_UITemporaryLayoutWidth' Hello.OtpInputView:0x104d3c5b0.width == 0   (active)>",
"<NSLayoutConstraint:0x1c4286e50 'UISV-canvas-connection' UIStackView:0x104d3e6f0.leading == Hello.CustomOtpTextField:0x10588d600.leading   (active)>",
"<NSLayoutConstraint:0x1c4286ea0 'UISV-canvas-connection' H:[Hello.CustomOtpTextField:0x105082600]-(0)-|   (active, names: '|':UIStackView:0x104d3e6f0 )>",
"<NSLayoutConstraint:0x1c4286f40 'UISV-fill-equally' Hello.CustomOtpTextField:0x105024600.width == Hello.CustomOtpTextField:0x10588d600.width   (active)>",
"<NSLayoutConstraint:0x1c4287030 'UISV-fill-equally' Hello.CustomOtpTextField:0x105077a00.width == Hello.CustomOtpTextField:0x10588d600.width   (active)>",
"<NSLayoutConstraint:0x1c42871c0 'UISV-fill-equally' Hello.CustomOtpTextField:0x105082600.width == Hello.CustomOtpTextField:0x10588d600.width   (active)>",
"<NSLayoutConstraint:0x1c4286ef0 'UISV-spacing' H:[Hello.CustomOtpTextField:0x10588d600]-(10)-[Hello.CustomOtpTextField:0x105024600]   (active)>",
"<NSLayoutConstraint:0x1c4286fe0 'UISV-spacing' H:[Hello.CustomOtpTextField:0x105024600]-(10)-[Hello.CustomOtpTextField:0x105077a00]   (active)>",
"<NSLayoutConstraint:0x1c42870d0 'UISV-spacing' H:[Hello.CustomOtpTextField:0x105077a00]-(10)-[Hello.CustomOtpTextField:0x105082600]   (active)>"

)

将尝试通过打破约束来恢复

我如何声明StackView：

stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.axis = .horizontal
stackView.distribution = .fillEqually
stackView.spacing = 10

//textFields is just an array of UITextFields
textFields.enumerated().forEach { (index,field) in
    field.textColor = UIColor.darkGray
    field.font = Font.sourceSansRegular?.withSize(46)
    field.keyboardType = .numberPad
    field.delegate = self
    field.translatesAutoresizingMaskIntoConstraints = false
    field.tag = index
    field.textAlignment = .center
    field.myDelegate = self
    field.sizeToFit()
    stackView.addArrangedSubview(field)
    field.widthAnchor.constraint(equalTo: stackView.widthAnchor, multiplier: (CGFloat(0 / textFields.count)),constant: CGFloat(10 * (textFields.count - 1))).isActive = true
}

self.addSubview(stackView)
stackView.anchor(self.topAnchor, left: self.leftAnchor, bottom: self.bottomAnchor, right: self.rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)

我想要的是例如UIStackView有110pt宽度和10空间然后UITextFields应该有20pt（（20 * 4）+（3 * 10），这是110）。因此，所有UITextFields都应具有相同的宽度（同等填充）

我怎样才能做到这一点？

编辑：我想我需要为一个TextField指定至少一个宽度，所以我添加了

 field.widthAnchor.constraint(equalTo: stackView.widthAnchor, multiplier: (CGFloat(0 / textFields.count)),constant: CGFloat(10 * (textFields.count - 1))).isActive = true

但是这也会给出中断错误。

EDIT2：这个堆栈视图在一个自定义的UIView中，我在里面给锚点

 override init(frame: CGRect) {
    super.init(frame: frame)
    //Where I gave all anchors
    setupUI()
}

另外我如何初始化这个自定义UIView

    override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    self.view.backgroundColor = UIColor.white
    self.view.addSubview(otpField)
    otpField.anchor(self.view.topAnchor, left: self.view.leftAnchor, bottom: nil, right: self.view.rightAnchor, topConstant: 40, leftConstant: 40, bottomConstant: 0, rightConstant: 40, widthConstant: 0, heightConstant: 60)
}

我想在图片中实现的目标：

Answer 1

如果你已经设置了stackView.distribution = .fillEqually为你的任何textFiled添加一个约束，你只需要为高度添加一个约束

let height = NSLayoutConstraint(item: textField1, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 40.0)
textField1.addConstraint = height

通过这样做你的所有文本字段将是高度40，总大小将取决于项目的数量和间隔给予，即Height = 40，Space = 10然后总高度将是(Height * Number of textfields) + (Space * (number of textfield - 1))

注意：垂直和水平堆栈视图的概念是相同的，您需要使用高度和宽度。