动态地将视图添加到UIStackview

Question

我正在尝试将视图（或按钮）动态添加到UIStackView。

首先，UIStackView没有（垂直）排列的视图，并且 从http响应中获取后，几个视图（按钮）被添加到UIStackView中。 UIStackView也是自动版式，可容纳特定区域。 我试图找到动态添加示例，但失败了。

任何人都可以向我展示将视图动态添加到UIStackView上的示例吗？

Answer 1

这可能会对您有所帮助。请遵循以下几点：

• 在情节提要或XIB中将UIScrollView添加到您的UIViewController中。
• 初始化一个NSMutableArray的名称，arrViews得到服务器响应并在数组中添加视图。
• 通过init方法初始化UIStackView传递arrView数组。
• 之后，UIStackView将被添加到UIScrollView的子视图中。

• 以编程方式将约束添加到UIStackView。就是这样。

  if let response = self.serverResponse {
      if let body = response.responseBody {
  
          if let view = body.views {
              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
  

希望它会对您有所帮助。编码愉快：）

Answer 2

我在我的一个项目中使用以下代码：

    let baseFrame = CGRect(origin: .zero, size: CGSize(width: requiredWidth, height: partitionHeight))
    for instrument in instruments {
        let partitionView = PartitionOnDemand(instrument: instrument, mode: playbackMode, frame: baseFrame, referenceView: partitionsAnimator)
        partitionsStackView.addArrangedSubview(partitionView)
        let tab = InstrumentInfoTabContainer.instantiate(with: instrument) {
            self.focus(on: instrument)
        }
        tabsStackView.addArrangedSubview(tab)
    }

Answer 3

在尝试答案的同时，我碰巧找到了解决方法。

class ViewController: UIViewController {

@IBOutlet weak var stack: UIStackView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
@IBAction func onBtn_Create(_ sender: Any) {
    createButton("new button ...")
}
@IBAction func onBtn_Delete(_ sender: Any) {
    if let v = stack.arrangedSubviews.last {
        stack.removeArrangedSubview(v)
        v.removeFromSuperview()
    }

}


func createButton(_ title: String) {
    let button = UIButton()
    button.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
    button.backgroundColor = UIColor.blue
    button.setTitle(title, for: .normal)
    button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)

    stack.addArrangedSubview(button)
}


@objc func buttonAction(sender: UIButton!) {
    print("Button tapped")
}

}

然后，我锚定到UIStackView，Trailing = 0，Leading = 0，Top = 0，Bottom = 8到TextView.Top

其中的子视图完好无损。

谢谢。