Swift:使用子视图后滚动视图不起作用
Swift: scrollview after use subviews not work
我想以编程方式将子视图添加到 scrollview
如果我将 subviews
添加到 scrollview
,滚动将不起作用
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
我尝试了 scrollView
中的一个视图,但再次无法正常工作
在正常的情节提要中工作正常,但是 addSubView
不工作
我该如何解决?
首先最好使用UIStackView
,这里需要为最后一项添加底部约束
if let last = viewAll.last {
NSLayoutConstraint.activate([
last.bottomAnchor.constraint(equalTo: view.scrollView.bottomAnchor)
])
}
我想以编程方式将子视图添加到 scrollview
如果我将 subviews
添加到 scrollview
,滚动将不起作用
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
我尝试了 scrollView
中的一个视图,但再次无法正常工作
在正常的情节提要中工作正常,但是 addSubView
不工作
我该如何解决?
首先最好使用UIStackView
,这里需要为最后一项添加底部约束
if let last = viewAll.last {
NSLayoutConstraint.activate([
last.bottomAnchor.constraint(equalTo: view.scrollView.bottomAnchor)
])
}