如何在视图中居中滚动视图

Question

我在视图控制器的视图中添加了一个滚动视图。 在 iPhone XR 上，滚动视图子视图显示在左侧，因为 scrollView 不会展开其父视图且未居中。 如何使滚动视图采用其父视图的全宽和高度并将其居中？

Answer 1

将以下约束添加到滚动视图

 scrollview.translatesAutoresizingMaskIntoConstraints = false
    self.view.addSubview(scrollview)
    scrollview.topAnchor.constraint(equalTo: self.view.topAnchor, constant : 0).isActive = true
    scrollview.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant : 0).isActive = true
    scrollview.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant :0).isActive = true
    scrollview.centerXAnchor.constraint(equalTo: self.view.centerXAnchor, constant: 0).isActive = true
    scrollview.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0).isActive = true