ios - 如何安排 `UIStackView` 中的 View ？

Question

我想在 UIStackView 中设置四个水平方向的 View 。四个 View 相邻，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，我看结果如下。

为什么这四个 View 位于屏幕的左上角？

Answer 1

您将每个 View 作为 subview 添加到堆栈 View 中，而不是将每个 View 作为排列的 subview 添加。虽然它们听起来很相似，但只有排列好的 subview 是根据堆栈 View 的属性进行布局的。

因此您将更改这些行:

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 View ，insertArrangedSubview(_:at:) 是 addArrangedSubview(_:) 的替代方法