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using UIKit;
using UIStackViewPlayground.Helpers;
namespace UIStackViewPlayground.Views
{
public class NestedStacksViewController : BaseViewController
{
public override void ViewDidLoad()
{
base.ViewDidLoad();
// Main scrolled stack
var stackView = new UIStackView
{
TranslatesAutoresizingMaskIntoConstraints = false,
Axis = UILayoutConstraintAxis.Vertical,
Alignment = UIStackViewAlignment.Fill,
Distribution = UIStackViewDistribution.EqualSpacing,
Spacing = 4,
LayoutMargins = new UIEdgeInsets(4, 4, 4, 4), // apply padding
LayoutMarginsRelativeArrangement = true // apply padding
};
var scroll = new UIScrollView { TranslatesAutoresizingMaskIntoConstraints = false };
Add(scroll);
scroll.AddSubview(stackView);
scroll.FullSizeOf(View);
stackView.FullSizeOf(scroll);
stackView.WidthAnchor.ConstraintEqualTo(scroll.WidthAnchor).Active = true;
// Nested stacks
var nested1 = new UIStackView
{
TranslatesAutoresizingMaskIntoConstraints = false,
Axis = UILayoutConstraintAxis.Horizontal,
Alignment = UIStackViewAlignment.Fill,
Distribution = UIStackViewDistribution.FillEqually,
Spacing = 4
};
var nested2 = new UIStackView
{
TranslatesAutoresizingMaskIntoConstraints = false,
Axis = UILayoutConstraintAxis.Horizontal,
Alignment = UIStackViewAlignment.Fill,
Distribution = UIStackViewDistribution.EqualSpacing,
Spacing = 4
};
var nested3 = new UIStackView
{
TranslatesAutoresizingMaskIntoConstraints = false,
Axis = UILayoutConstraintAxis.Horizontal,
Alignment = UIStackViewAlignment.Fill,
Distribution = UIStackViewDistribution.FillProportionally,
Spacing = 4
};
var nested4 = new UIStackView
{
TranslatesAutoresizingMaskIntoConstraints = false,
Axis = UILayoutConstraintAxis.Horizontal,
Alignment = UIStackViewAlignment.Top,
Distribution = UIStackViewDistribution.EqualCentering,
Spacing = 4
};
var nested5 = new UIStackView
{
TranslatesAutoresizingMaskIntoConstraints = false,
Axis = UILayoutConstraintAxis.Horizontal,
Alignment = UIStackViewAlignment.Fill,
Distribution = UIStackViewDistribution.EqualSpacing,
Spacing = 4
};
for (var i = 0; i < 3; i++)
{
nested1.AddArrangedSubview(GetRandomView());
nested2.AddArrangedSubview(GetRandomView());
nested3.AddArrangedSubview(GetRandomView());
nested4.AddArrangedSubview(GetRandomView(50, 15 * (i + 1)));
}
stackView.AddArrangedSubview(GetNestedStackContainer("Fill Equally", nested1));
stackView.AddArrangedSubview(GetNestedStackContainer("Equal Spacing", nested2));
stackView.AddArrangedSubview(GetNestedStackContainer("Fill Proportionally", nested3));
for(var i = 0; i < 30; i++)
nested5.AddArrangedSubview(GetRandomView());
var nestedScroll = new UIScrollView { TranslatesAutoresizingMaskIntoConstraints = false };
nestedScroll.AddSubview(nested5);
stackView.AddArrangedSubview(GetNestedStackContainer("Nested stack with scroll", nestedScroll));
nested5.FullSizeOf(nestedScroll);
nested5.HeightAnchor.ConstraintEqualTo(nestedScroll.HeightAnchor).Active = true;
stackView.AddArrangedSubview(GetNestedStackContainer("Align Top", nested4));
}
private static UIView GetNestedStackContainer(string title, UIView stackView)
{
var view = new RoundedView {BackgroundColor = UIColor.LightGray};
view.Layer.BorderColor = UIColor.Gray.CGColor;
view.HeightAnchor.ConstraintEqualTo(110).Active = true;
var label = new UILabel
{
Text = title,
TranslatesAutoresizingMaskIntoConstraints = false
};
view.Add(label);
view.Add(stackView);
NSLayoutConstraint.ActivateConstraints(new []
{
label.LeadingAnchor.ConstraintEqualTo(view.LeadingAnchor, 10),
label.TrailingAnchor.ConstraintEqualTo(view.TrailingAnchor, -10),
label.TopAnchor.ConstraintEqualTo(view.TopAnchor, 8),
label.HeightAnchor.ConstraintEqualTo(22),
stackView.LeadingAnchor.ConstraintEqualTo(label.LeadingAnchor),
stackView.TrailingAnchor.ConstraintEqualTo(label.TrailingAnchor),
stackView.TopAnchor.ConstraintEqualTo(label.BottomAnchor, 5),
stackView.BottomAnchor.ConstraintEqualTo(view.BottomAnchor, -8)
});
return view;
}
private static UIView GetRandomView(float width = 50, float? height = null)
{
var view = new RoundedView { BackgroundColor = ColorUtil.GetRandomColor() };
view.WidthAnchor.ConstraintEqualTo(width).Active = true;
if (height != null)
view.HeightAnchor.ConstraintEqualTo(height.Value).Active = true;
return view;
}
}
}