使用 Cirrious.FluentLayout

使用 NuGet

Install-Package Cirrious.FluentLayout

基于 GitHub 页面上的入门示例的扩展示例，简单的名字，姓氏标签和字段全部堆叠在另一个上面：

public override void ViewDidLoad()
{
    //create our labels and fields
    var firstNameLabel = new UILabel();
    var lastNameLabel = new UILabel();
    var firstNameField = new UITextField();
    var lastNameField = new UITextField();

    //add them to the View
    View.AddSubviews(firstNameLabel, lastNameLabel, firstNameField, lastNameField);
    
    //create constants that we can tweak if we do not like the final layout
    const int vSmallMargin = 5;
    const int vMargin = 20;
    const int hMargin = 10;

    //add our constraints
    View.SubviewsDoNotTranslateAutoresizingMaskIntoConstraints();        
    View.AddConstraints(
        firstNameLabel.WithSameTop(View).Plus(vMargin),
        firstNameLabel.AtLeftOf(View).Plus(hMargin),
        firstNameLabel.WithSameWidthOf(View),

        firstNameField.WithSameWidth(firstNameLabel),
        firstNameField.WithSameLeft(firstNameLabel),
        firstNameField.Below(firstNameLabel).Plus(vSmallMargin),

        lastNameLabel.Below(firstNameField).Plus(vMargin),
        lastNameLabel.WithSameLeft(firstNameField),
        lastNameLabel.WithSameWidth(firstNameField),

        lastNameField.Below(lastNameLabel).Plus(vSmallMargin),
        lastNameField.WithSameWidth(lastNameLabel),
        lastNameField.WithSameLeft(lastNameLabel));
}