我的目标是在 UIScrollView 的末尾(右下)设置一个 UIView。我看到使用 UIContentSize 的解决方案,但我不想使用此属性,因为它不适合: UIView 宽度不等于 UIScrollview contentSize。
UIView 是 UIScrollView 的 subview ,我只需要水平滚动。我认为我必须使用约束才能将 UIView 粘在 UIscrollview 的末尾(这意味着 UIView 右侧与 UIScrollView 右侧相同,两者具有相同的高度)
我所做的是:
let horizontalConstraint = NSLayoutConstraint(item: self.myView , attribute: NSLayoutAttribute.Right, relatedBy: NSLayoutRelation.Equal, toItem: self.myScrollView , attribute: NSLayoutAttribute.Right, multiplier: 1, constant: 0)
self.myScrollView.addConstraint(horizontalConstraint)
let verticalConstraint = NSLayoutConstraint(item: self.myView, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: self.myScrollView, attribute: NSLayoutAttribute.Top, multiplier: 1, constant: 0)
self.myScrollView.addConstraint(verticalConstraint)
我对如何设置这个约束有点困惑和困惑,我可能是错的,因为我的 View 不再显示。我需要定义所有约束还是仅定义右侧约束和顶部约束?有什么建议吗?谢谢
最佳答案
UIScrollView
从它的 subview 中获取内容大小,因此它只会与它包含的内容一样大。我们无法独立设置它的大小。一切都应该在 subview 中。
决定您想要的 myScrollView
的大小:
let myViewWidth = myView.frame.width
let myViewHeight = myView.frame.height
let screenWidth = myScrollView.frame.width
let scrollContentWidth = myViewWidth + screenWidth
创建一个 subview ,我们称之为widthView
let widthView = UIView(frame: CGFloat(x: 0, y: 0, width: scrollContentWidth, height: myViewHeight))
myScrollView.addSubview(widthView)
let leadingEdgeConstraint = NSLayoutConstraint(item: widthView, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: myScrollView, attribute: NSLayoutAttribute.Leading, multiplier: 1, constant: 0)
myScrollView.addConstraint(leadingEdgeConstraint)
let trailingEdgeConstraint = NSLayoutConstraint(item: widthView, attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: myScrollView, attribute: NSLayoutAttribute.Trailing, multiplier: 1, constant: 0)
myScrollView.addConstraint(trailingEdgeConstraint)
let widthContainerConstraint = NSLayoutConstraint(item: widthView, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: scrollContentWidth)
myScrollView.addConstraint(widthContainerConstraint)
现在将您的 myView 添加到该 View :
widthView.addSubview(myView)
myView.translatesAutoresizingMaskIntoConstraints = false
let horizontalConstraint = NSLayoutConstraint(item: myView , attribute: NSLayoutAttribute.Right, relatedBy: NSLayoutRelation.Equal, toItem: widthView , attribute: NSLayoutAttribute.Right, multiplier: 1, constant: 0)
widthView.addConstraint(horizontalConstraint)
let heightConstraint = NSLayoutConstraint(item: myView, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: myViewHeight)
widthView.addConstraint(heightConstraint)
let widthConstraint = NSLayoutConstraint(item: myView, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: myViewWidth)
widthView.addConstraint(widthConstraint)
关于ios - 将 View 放在 UIScrollview 的末尾 - Swift,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34136611/