Ios 如何以编程方式使用自动布局在scrollview中水平放置N个视图？

我想在scrollview中水平创建N个视图。因此，我创建了一个临时视图，并将当前视图指定给该视图。然后我基于该视图放置约束。只有一个视图显示其他视图未显示。 我想要两个视图之间的水平空间。 我正在使用VFL设置自动布局。 这是我的代码

func ect() {
        let scrollHeight = self.scrollObj.frame.size.height - 40
        let scrollHeightString = String(describing: scrollHeight)
        print(scrollHeightString)
        var firstTextView = UIView() // this is temporary view
        var columnIndex: CGFloat = 0
        for  _ in 0 ..< 5 {
            let textViewSample = UITextView()
            textViewSample.translatesAutoresizingMaskIntoConstraints = false
            //textViewSample.attributedText = self.htmlString.utf8Data?.attributedString
            textViewSample.isScrollEnabled = false
            textViewSample.tag = Int(columnIndex)
            textViewSample.backgroundColor = UIColor.green
            self.scrollObj.addSubview(textViewSample)

            if columnIndex == 0{
//here i am setting first view to left margin.
            self.scrollObj.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[textViewSample]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["textViewSample":textViewSample]))

                //height to textview
                self.scrollObj.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[textViewSample(200)]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["textViewSample":textViewSample]))

                //width to textview
                self.scrollObj.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[textViewSample(200)]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["textViewSample":textViewSample]))

            }else{

             //setting horizontal space to Temp view and current view   
            self.scrollObj.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-[firstTextView]-(10)-[textViewSample]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["textViewSample":textViewSample,"firstTextView":firstTextView]))
                //setting equal width and equal height to second textview based on first
                self.scrollObj.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[firstTextView][textViewSample(==firstTextView)]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["textViewSample":textViewSample,"firstTextView":firstTextView]))

            }

            //y position to textview
            self.scrollObj.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-(20)-[textViewSample]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["textViewSample":textViewSample]))

            firstTextView = textViewSample//assigning current view to temp view.
            // Increase the current offset
            columnIndex = columnIndex + 1
            }
        self.scrollObj.contentSize = CGSize(width: columnIndex*200, height: columnIndex*200)
        self.scrollObj .setNeedsLayout()
        self.scrollObj.layoutIfNeeded()
    }

function（）{
设scrollHeight=self.scrollObj.frame.size.height-40
让scrollHeightString=String（描述：scrollHeight）
打印（滚动高度字符串）
var firstTextView=UIView（）//这是临时视图
变量列索引：CGFloat=0
对于0..<5中的uu{
让textViewSample=UITextView（）
textViewSample.TranslatesAutoResizezingMaskintoConstraints=false
//textViewSample.attributedText=self.htmlString.utf8Data？.attributedString
textViewSample.IsScrolEnabled=false
textViewSample.tag=Int（columnIndex）
textViewSample.backgroundColor=UIColor.green
self.scrollObj.addSubview（textViewSample）
如果columnIndex==0{
//在这里，我将第一个视图设置为左边距。
self.scrollObj.addConstraints（NSLayoutConstraint.constraints（带可视格式：“H:|[textViewSample]”），选项：NSLayoutFormatOptions（rawValue:0），度量：nil，视图：[“textViewSample”：textViewSample]））
//文本视图的高度
self.scrollObj.addConstraints（NSLayoutConstraint.constraints（带可视格式：“V:[textViewSample（200）]”，选项：NSLayoutFormatOptions（rawValue:0），度量：nil，视图：[“textViewSample”：textViewSample]））
//文本视图的宽度
self.scrollObj.addConstraints（NSLayoutConstraint.constraints（带可视格式：“H:[textViewSample（200）]”，选项：NSLayoutFormatOptions（rawValue:0），度量：nil，视图：[“textViewSample”：textViewSample]））
}否则{
//将水平空间设置为临时视图和当前视图
self.scrollObj.addConstraints（NSLayoutConstraint.constraints（使用VisualFormat:|-[firstTextView]-（10）-[textViewSample]”，选项：NSLayoutFormatOptions（rawValue:0），度量：nil，视图：[“textViewSample”：textViewSample，“firstTextView”：firstTextView]））
//基于第一个文本视图设置第二个文本视图的等宽等高
self.scrollObj.addConstraints（NSLayoutConstraint.constraints（具有可视化格式：“H:[firstTextView][textViewSample（=firstTextView）]”），选项：NSLayoutFormatOptions（rawValue:0），度量：nil，视图：[“textViewSample”：textViewSample，“firstTextView”：firstTextView]））
}
//文本视图的y位置
self.scrollObj.addConstraints（NSLayoutConstraint.constraints（带可视格式：“V:|-（20）-[textViewSample]”），选项：NSLayoutFormatOptions（rawValue:0），度量：nil，视图：[“textViewSample”：textViewSample]））
firstTextView=textViewSample//将当前视图分配给临时视图。
//增加当前偏移量
columnIndex=columnIndex+1
}
self.scrollObj.contentSize=CGSize（宽度：columnIndex*200，高度：columnIndex*200）
self.scrollObj.setNeedsLayout（）
self.scrollObj.layoutifneed（）文件
}

这就是我的设计：-

---

如果要使用约束，可以执行以下操作：

var previousAnchor = scrollView.leadingAnchor

for _ in 0 ..< 5 {
    let textView = UITextView()
    textView.translatesAutoresizingMaskIntoConstraints = false
    textView.backgroundColor = .green
    textView.isScrollEnabled = false
    scrollView.addSubview(textView)

    NSLayoutConstraint.activate([
        textView.leadingAnchor.constraint(equalTo: previousAnchor, constant: 10),
        textView.heightAnchor.constraint(equalToConstant: 200),
        textView.widthAnchor.constraint(equalToConstant: 200),
        textView.topAnchor.constraint(equalTo: scrollView.topAnchor, constant: 10),
        textView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor, constant: -10)
    ])

    previousAnchor = textView.trailingAnchor
}

previousAnchor.constraint(equalTo: scrollView.trailingAnchor, constant: -10).isActive = true

同样，您说过希望滚动视图的高度小于10（大概在两侧）。因此，您可以执行类似操作，再次将200pt固定高度约束替换为：

textView.heightAnchor.constraint(equalTo: scrollViewContainer.heightAnchor, constant: -20)

现在，由于您无法引用scrollview的

边界

，我所做的是将scroll视图放在容器视图中（

scrollViewContainer

），因此此父视图的边界与scroll视图的边界相同。现在，约束可以引用此父视图，您将相对于滚动视图的边界而不是滚动视图的

contentSize

设置这些子视图

但当您这样做时，您会看到滚动视图中的前三个视图（我可以向右滚动查看其余视图）：

---

在我的演示中，我已经做到了这一点

在

ViewDidLoad

        // add scrollView
        let scrollView = UIScrollView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height))
        self.view.addSubview(scrollView)

        // scrollview contraints

        scrollView.translatesAutoresizingMaskIntoConstraints = false

        scrollView.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0).isActive = true
        scrollView.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 0).isActive = true
        scrollView.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: 0).isActive = true


        // add viewContainer
        let viewContainer = UIView(frame: CGRect(x: 0, y: 0, width: scrollView.frame.size.width, height: scrollView.frame.size.height)) // View just after the SV
        viewContainer.backgroundColor = UIColor.lightGray
        scrollView.addSubview(viewContainer)

        // viewcontainer contraints

        //viewContainer.translatesAutoresizingMaskIntoConstraints = false

        viewContainer.topAnchor.constraint(equalTo: scrollView.topAnchor, constant: 0).isActive = true
        viewContainer.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor, constant: 0).isActive = true
        viewContainer.leftAnchor.constraint(equalTo: scrollView.leftAnchor, constant: 0).isActive = true
        viewContainer.rightAnchor.constraint(equalTo: scrollView.rightAnchor, constant: 0).isActive = true


        // add different subview in scrollview

        var originY:Int = 0
        for  i in 0 ..< 5 {

            let myInnerView = UIView(frame: CGRect(x: 0, y: originY , width: Int(scrollView.frame.size.width), height: 100))
            myInnerView.translatesAutoresizingMaskIntoConstraints = false

            viewContainer.addSubview(myInnerView)


            // for different UI different color
            switch i {
            case 0:
                     myInnerView.backgroundColor = UIColor.green
                break
            case 1:
                myInnerView.backgroundColor = UIColor.purple
                break
            case 2:
                myInnerView.backgroundColor = UIColor.yellow
                break
            case 3:
                myInnerView.backgroundColor = UIColor.orange
                break
            case 4:
                myInnerView.backgroundColor = UIColor.blue
                break

            default: break

            }

            originY = originY+100+20
        }

输出：

---

如果您需要放置动态视图，请使用UIStackView，我在堆栈视图中没有经验，这正是我所希望的。非常感谢@the_dahiya。。这非常有用，上面的答案对我很有帮助。您能检查一下这种非常有效的方法吗。。非常感谢先生！！当旋转到横向时，它不会被调整，我不想高度滚动，只想水平滚动。。。我正在设置textview高度，如下所示。。override func DIDROATE（来自fromInterfaceOrientation:UIInterfaceOrientation）{scrollHeight=Int（self.scrollObj.bounds.size.height-20）scrollWidth=Int（self.scrollObj.bounds.size.width/3-10）self.view.LayoutFneed（）self.scrollObj.LayoutFneed（）}200x200如果“检查视图”显示在“否”，我希望我的文本视图大小为从10像素开始的顶部，从10像素开始的底部，文本视图宽度基于滚动视图宽度/3我希望宽度大小基于三列滚动视图宽度挑战在于，在约束条件下，滚动视图及其子视图之间的约束中的引用指向滚动视图的

contentSize

，而不是滚动视图的

帧

/

边界

。因此，您必须参考滚动视图的父视图。但一旦你这样做了，你可以有高度-20和宽度/3-10（或其排列），当设备旋转时自动调整。见上面修改的答案。

        // add scrollView
        let scrollView = UIScrollView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height))
        self.view.addSubview(scrollView)

        // scrollview contraints

        scrollView.translatesAutoresizingMaskIntoConstraints = false

        scrollView.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0).isActive = true
        scrollView.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 0).isActive = true
        scrollView.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: 0).isActive = true


        // add viewContainer
        let viewContainer = UIView(frame: CGRect(x: 0, y: 0, width: scrollView.frame.size.width, height: scrollView.frame.size.height)) // View just after the SV
        viewContainer.backgroundColor = UIColor.lightGray
        scrollView.addSubview(viewContainer)

        // viewcontainer contraints

        //viewContainer.translatesAutoresizingMaskIntoConstraints = false

        viewContainer.topAnchor.constraint(equalTo: scrollView.topAnchor, constant: 0).isActive = true
        viewContainer.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor, constant: 0).isActive = true
        viewContainer.leftAnchor.constraint(equalTo: scrollView.leftAnchor, constant: 0).isActive = true
        viewContainer.rightAnchor.constraint(equalTo: scrollView.rightAnchor, constant: 0).isActive = true


        // add different subview in scrollview

        var originY:Int = 0
        for  i in 0 ..< 5 {

            let myInnerView = UIView(frame: CGRect(x: 0, y: originY , width: Int(scrollView.frame.size.width), height: 100))
            myInnerView.translatesAutoresizingMaskIntoConstraints = false

            viewContainer.addSubview(myInnerView)


            // for different UI different color
            switch i {
            case 0:
                     myInnerView.backgroundColor = UIColor.green
                break
            case 1:
                myInnerView.backgroundColor = UIColor.purple
                break
            case 2:
                myInnerView.backgroundColor = UIColor.yellow
                break
            case 3:
                myInnerView.backgroundColor = UIColor.orange
                break
            case 4:
                myInnerView.backgroundColor = UIColor.blue
                break

            default: break

            }

            originY = originY+100+20
        }

override func didRotate(from fromInterfaceOrientation: UIInterfaceOrientation) {
     self.view.layoutIfNeeded()

}