Swift:使用子视图后滚动视图不起作用 [英] Swift: scrollview after use subviews not work

问题描述

我想以编程方式将子视图添加到 scrollview

I want add sub view to the scrollview programmatically

如果我将 subviews 添加到 scrollview，滚动不起作用

If i add subviews to scrollview, scrolling not work

for subview in view.scrollView.subviews {
    subview.removeFromSuperview()
}

var j = 0
for value in getList {
    let viewChild = SelectClass.createMyClassView()
    viewChild.translatesAutoresizingMaskIntoConstraints = false
    viewAll[j] = viewChild

    viewChild.title.text = value.value

    view.scrollView.addSubview(viewChild)

    j = j+1
}

var i = 0
for subview in view.scrollView.subviews {
    let item = subview as? UIView
        NSLayoutConstraint.activate([
            (item?.leftAnchor.constraint(equalTo: view.scrollView.leftAnchor))!,
            (item?.rightAnchor.constraint(equalTo: view.scrollView.rightAnchor))!,
             (item?.heightAnchor.constraint(equalToConstant: 50))!
         ])

     if(i > 0){
         NSLayoutConstraint.activate([
             (item?.topAnchor.constraint(equalTo: (viewAll[i-1]?.bottomAnchor)!))!
         ])
     } else {
         NSLayoutConstraint.activate([
             (item?.topAnchor.constraint(equalTo: view.scrollView.topAnchor))!
         ])
     }

     i = i+1
}

view.scrollView.isScrollEnabled = true

我在 scrollView 中尝试了一个视图，但没有再次工作

I try one view in scrollView but not work again

在普通故事板中工作正常，但通过 addSubView 不起作用

In normal storyboard work fine, but by addSubView not work

我该如何解决?

推荐答案

首先最好使用 UIStackView ，这里需要为最后一项添加底部约束

First it's better using UIStackView , here you need to add bottom constraint for the last item

if let last =  viewAll.last {
     NSLayoutConstraint.activate([
         last.bottomAnchor.constraint(equalTo: view.scrollView.bottomAnchor)
     ])
}

这篇关于Swift:使用子视图后滚动视图不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！