Question

我如何水平对齐三个元素[A B C]并使其一个又一个受约束？

public static void AddConstraintsElements(UIView View, UIView element, UIView element2, UIView element3)
        {
            NSLayoutConstraint.ActivateConstraints(new[] {
                element.TopAnchor.ConstraintGreaterThanOrEqualTo(View.TopAnchor, constant: 20),
                element.LeadingAnchor.ConstraintGreaterThanOrEqualTo(View.LeadingAnchor, constant: 100),
                element.WidthAnchor.ConstraintGreaterThanOrEqualTo(View.WidthAnchor, 1),
                element.HeightAnchor.ConstraintGreaterThanOrEqualTo(View.HeightAnchor, 1),

                element2.BottomAnchor.ConstraintGreaterThanOrEqualTo(View.TopAnchor, constant: 20),
                element2.TrailingAnchor.ConstraintGreaterThanOrEqualTo(View.LeadingAnchor, constant: 120),
                element2.WidthAnchor.ConstraintGreaterThanOrEqualTo( 1),
                element2.HeightAnchor.ConstraintGreaterThanOrEqualTo( 1),

                element3.BottomAnchor.ConstraintGreaterThanOrEqualTo(View.TopAnchor, constant: 20),
                element3.TrailingAnchor.ConstraintGreaterThanOrEqualTo(View.LeadingAnchor, constant: 120),
                element3.WidthAnchor.ConstraintGreaterThanOrEqualTo( 1),
                element3.HeightAnchor.ConstraintGreaterThanOrEqualTo( 1)
            });
        }

其他具有第一和第二要素的情况，请删除第三要素：

我尝试了，但是没用

element1.WidthAnchor.ConstraintEqualTo(25).Active = true;
            element1.HeightAnchor.ConstraintEqualTo(element1.WidthAnchor).Active = true;

            element2.WidthAnchor.ConstraintEqualTo(30).Active = true;
            element2.HeightAnchor.ConstraintEqualTo(30).Active = true;



            element1.TrailingAnchor.ConstraintEqualTo(element2.LeadingAnchor).Active = true;

            element1.TopAnchor.ConstraintEqualTo(View.TopAnchor, 15).Active = true;
            element2.TopAnchor.ConstraintEqualTo(View.TopAnchor, 15).Active = true;

            element1.LeftAnchor.ConstraintEqualTo( View.CenterXAnchor).Active = true;
            element2.RightAnchor.ConstraintEqualTo(View.RightAnchor).Active = true;

Answer 1

假设您想将它们对齐：

+-----------------------------------------------+
|                       ^                       |
|                      120                      |
|                       v                       |
|       +---------++---------++---------+       |
|       |         ||         ||         |       |
|       |    A    ||    B    ||    C    |       |
|       |         ||         ||         |       |
|       +---------++---------++---------+       |
|                                               |
|                                               |
|                                               |

项目居中放置，从顶部开始指向120个点，并且它们的宽度和高度固定。您可以执行以下操作：

// set widths and heights
a.WidthAnchor.ConstraintEqualTo(25).Active = true;
a.HeightAnchor.ConstraintEqualTo(a.WidthAnchor).Active = true;

b.WidthAnchor.ConstraintEqualTo(25).Active = true;
b.HeightAnchor.ConstraintEqualTo(b.WidthAnchor).Active = true;

c.WidthAnchor.ConstraintEqualTo(25).Active = true;
c.HeightAnchor.ConstraintEqualTo(c.WidthAnchor).Active = true;

// align B view as the middle view
b.CenterXAnchor.ConstraintEqualTo(View.CenterXAnchor).Active = true;

// align A to left of B
a.TrailingAnchor.ConstraintEqualTo(b.LeadingAnchor).Active = true;

// align C to right of B
c.LeadingAnchor.ConstraintEqualTo(b.TrailingAnchor).Active = true;

// align A, B and C, 120 points from the top
a.TopAnchor.ConstraintEqualTo(View.TopAnchor, 120).Active = true;
b.TopAnchor.ConstraintEqualTo(View.TopAnchor, 120).Active = true;
c.TopAnchor.ConstraintEqualTo(View.TopAnchor, 120).Active = true;

Answer 2

我将居中对齐B，然后将宽度设置为首选高度，然后将A和C匹配到B的宽度，高度和垂直方向，并将A和C相对于B的水平方向匹配为首选。

所以

B->宽度，高度，垂直，水平

A->将宽度与B匹配，将高度与B匹配，将垂直与B匹配，参照B的位置（例如-15或类似位置）设置“水平”

C->将宽度与B匹配，将高度与B匹配，将垂直与B匹配，参照B的位置（例如+15或类似值）设置“水平”

如何与约束水平对齐？

2 个答案: