自动布局约束边界条件

Question

我希望 view1 的右约束等于 view2 的左约束，但如果 view2 移过 view1 的左侧（边界条件）则不是。这是我的限制条件：

    view1.leftAnchor.constraint(equalTo: contentView.leftAnchor, constant: 0).isActive = true
    view1.bottomAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true
    view1.topAnchor.constraint(equalTo: contentView.topAnchor).isActive = true
    view1.leftAnchor.constraint(greaterThanOrEqualToSystemSpacingAfter: contentView.leftAnchor, multiplier: 1.0).isActive = true


   let rightBoundaryConstraint = view1.rightAnchor.constraint(equalTo: iew2.leftAnchor)

    rightBoundaryConstraint.priority = UILayoutPriority(999)
    rightBoundaryConstraint.isActive = true

我怀疑这仍然不能 100% 确定 view1 的位置。我错过了什么吗？

Answer 1

这表示 "expand or contract view1 so its right-edge is at the left-edge of view2":

view1.rightAnchor.constraint(equalTo: view2.leftAnchor).isActive = true

添加这个：

view2.leftAnchor.constraint(greaterThanOrEqualTo: view1.leftAnchor).isActive = true

表示："Don't let view2's left-edge go past view1's left edge"

自动布局约束边界条件

Autolayout constraints boundary condition

uikit

ios

autolayout

ios-autolayout