如何在`UIStackView`中安排视图？

Question

我想在UIStackView中设置四个水平方向的视图。每个旁边的四个视图没有空格。

我的代码：

let arrangeStackView = UIStackView()
let followUpActionView = UIView()
let developCurriculumView = UIView()
let moreMoreView = UIView()
let takeCareSalonView = UIView()

override func viewDidLoad() {
    super.viewDidLoad()

    view.addSubview(arrangeStackView)

    developCurriculumView.translatesAutoresizingMaskIntoConstraints = false;
    followUpActionView.translatesAutoresizingMaskIntoConstraints = false;
    takeCareSalonView.translatesAutoresizingMaskIntoConstraints = false;
    moreMoreView.translatesAutoresizingMaskIntoConstraints = false;

    developCurriculumView.backgroundColor = UIColor(red: CGFloat(arc4random()%256)/255.0, green: CGFloat(arc4random()%256)/255.0, blue: CGFloat(arc4random()%256)/255.0, alpha: 1)
    followUpActionView.backgroundColor = UIColor(red: CGFloat(arc4random()%256)/255.0, green: CGFloat(arc4random()%256)/255.0, blue: CGFloat(arc4random()%256)/255.0, alpha: 1)
    takeCareSalonView.backgroundColor = UIColor(red: CGFloat(arc4random()%256)/255.0, green: CGFloat(arc4random()%256)/255.0, blue: CGFloat(arc4random()%256)/255.0, alpha: 1)
    moreMoreView.backgroundColor = UIColor(red: CGFloat(arc4random()%256)/255.0, green: CGFloat(arc4random()%256)/255.0, blue: CGFloat(arc4random()%256)/255.0, alpha: 1)


    arrangeStackView.axis = .horizontal
    arrangeStackView.distribution = .fillEqually

    arrangeStackView.spacing = 10
    arrangeStackView.alignment = .fill

    arrangeStackView.translatesAutoresizingMaskIntoConstraints = false
    arrangeStackView.addSubview(followUpActionView)
    arrangeStackView.addSubview(developCurriculumView)
    arrangeStackView.addSubview(moreMoreView)
    arrangeStackView.addSubview(takeCareSalonView)


    arrangeStackView.snp.makeConstraints { (make) in
        make.center.equalToSuperview()
        make.height.equalTo(95)
        make.width.equalToSuperview()
    }

    let yaIconWith = self.view.frame.width * 0.25

    followUpActionView.snp.makeConstraints{(make) -> Void in
        make.height.equalToSuperview()
        make.width.equalTo(yaIconWith)
    }
    takeCareSalonView.snp.makeConstraints{(make) -> Void in
        make.height.equalToSuperview()
        make.width.equalTo(yaIconWith)
    }
    moreMoreView.snp.makeConstraints{(make) -> Void in
        make.height.equalToSuperview()
        make.width.equalTo(yaIconWith)
    }
    developCurriculumView.snp.makeConstraints{(make) -> Void in
        make.height.equalToSuperview()
        make.width.equalTo(yaIconWith)
    }

现在，我看下面的结果。

为什么四个视图位于屏幕的左上角？

Answer 1

UIStackView仅分发其 arrangeSubViews 而非其常规子视图。使用addArrangedSubview代替addSubView。

Answer 2

您将每个视图作为子视图添加到堆栈视图，而不是将每个视图添加为已排列的子视图。虽然它们听起来很相似，但只根据堆栈视图的属性布置了排列的子视图。

所以你会改变这些行：

arrangeStackView.addSubview(followUpActionView)
arrangeStackView.addSubview(developCurriculumView)
arrangeStackView.addSubview(moreMoreView)
arrangeStackView.addSubview(takeCareSalonView)

对此：

arrangeStackView.addArrangedSubview(followUpActionView)
arrangeStackView.addArrangedSubview(developCurriculumView)
arrangeStackView.addArrangedSubview(moreMoreView)
arrangeStackView.addArrangedSubview(takeCareSalonView)

如果您需要特殊安排，或者如果您需要在某些地方的不同时间添加观看次数，insertArrangedSubview(_:at:)可以替代addArrangedSubview(_:)