动态添加视图到 UIStackview

Question

我正在尝试向 UIStackView 动态添加视图（或按钮）。

起初，UIStackView没有排列视图（垂直），并且从一些 http 响应中获取后，几个视图（按钮）被添加到 UIStackView。 UIStackView 也是自动布局以容纳特定区域。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在 UIStackView 上动态添加视图的示例吗？

Answer 1

我在我的一个项目中使用了这段代码：

    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 2

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。

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

希望对您有所帮助。编码愉快:)

Answer 3

在尝试寻找答案时，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")
}

}

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

里面的子视图完好无损

谢谢。

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