如何在打开和关闭 UIswitch 时上下移动标签？

Question

我有一个 UIswitch，当它打开时，我想在它下面显示一个视图并将所有其他视图向下移动。同样，当开关关闭时，视图应该消失并像以前一样重新排列所有视图。

  @objc func switchValueDidChange(_ sender: UISwitch) {
    if sender == fuelSwitch{
        if (sender.isOn == true){
            // show fuel view
            print("on")
            fuelRequiredView?.isHidden = false
            topConstraint = layoutConstraints.setTopMargin(isOverloadedLabel, attribute1: .topMargin, relatedBy: .equal, toItem: fuelRequiredView, attribute2: .topMargin, multiplier: 2.0, constant: 0)
            contentView?.addConstraint(topConstraint!)
            topConstraint = layoutConstraints.setTopMargin(overloadedSwitch, attribute1: .topMargin, relatedBy: .equal, toItem: fuelRequiredView, attribute2: .topMargin, multiplier: 2.0, constant: 0)
            contentView?.addConstraint(topConstraint!)

        }
        else{
            // hide fuel view
            print("off")
            fuelRequiredView?.isHidden = true
            topConstraint = layoutConstraints.setTopMargin(isOverloadedLabel, attribute1: .topMargin, relatedBy: .equal, toItem: contentView, attribute2: .topMargin, multiplier: 2.4, constant: 0)
            contentView?.addConstraint(topConstraint!)
            topConstraint = layoutConstraints.setTopMargin(overloadedSwitch, attribute1: .topMargin, relatedBy: .equal, toItem: contentView, attribute2: .topMargin, multiplier: 2.4, constant: 0)
            contentView?.addConstraint(topConstraint!)
        }
    }

image

Answer 1

可能对你有帮助。请遵循以下几点：

将 UIScrollView 添加到故事板或 XIB 中的 UIViewController。
启动一个 NSMutableArray 命名它 arrViews 获取服务器响应并在数组中添加视图。
初始化 UIStackView在 init 方法中传递 arrView 数组。
之后 UIStackView 将添加 UIScrollView 的子视图。

以编程方式向 UIStackView 添加约束。就是这样。

let arrViews =  createSubViews(view)
let stackView = UIStackView(arrangedSubviews: arrViews)
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.axis = .vertical
stackView.spacing = 16
stackView.distribution = .fill
self.scrollView.addSubview(stackView)

//constraints

let leading = NSLayoutConstraint(item: stackView, attribute: .leading, relatedBy: .equal, toItem: self.scrollView, attribute: .leading, multiplier: 1.0, constant: 0)
self.scrollView.addConstraint(leading)
let trailing = NSLayoutConstraint(item: stackView, attribute: .trailing, relatedBy: .equal, toItem: self.scrollView, attribute: .trailing, multiplier: 1.0, constant: 0)
self.scrollView.addConstraint(trailing)
let top = NSLayoutConstraint(item: stackView, attribute: .top, relatedBy: .equal, toItem: self.scrollView, attribute: .top, multiplier: 1.0, constant: 0)
self.scrollView.addConstraint(top)

let bottom = NSLayoutConstraint(item: stackView, attribute: .bottom, relatedBy: .equal, toItem: self.scrollView, attribute: .bottom, multiplier: 1.0, constant: 0)
self.scrollView.addConstraint(bottom)

let equalWidth = NSLayoutConstraint(item: stackView, attribute: .width, relatedBy: .equal, toItem: self.scrollView, attribute: .width, multiplier: 1.0, constant: 0)

self.scrollView.addConstraint(equalWidth)


leading.isActive = true
trailing.isActive = true
top.isActive = true
bottom.isActive = true
equalWidth.isActive = true

之后，当您单击开关时，从视图数组中获取一个视图并将其隐藏，所有其他视图会自动重新排列。

@objc func switchValueDidChange(_ sender: UISwitch) {
if sender == fuelSwitch{
      let fuelRequiredView = arrViews[index] // get index of fuelRequiredView
    if (sender.isOn == true){
        // show fuel view
        print("on")
        fuelRequiredView?.isHidden = false
    }
    else{
        // hide fuel view
        print("off")
        fuelRequiredView?.isHidden = true
    }
}

希望对您有所帮助。编码愉快:)

如何在打开和关闭 UIswitch 时上下移动标签？

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uiswitch

ios

autolayout

swift