public override void ViewDidLoad()
{
base.ViewDidLoad();
View.Layer = new CALayer();
View.Layer.BackgroundColor = NSColor.White.CGColor;
// create the sub views
var greenView = new NSView();
greenView.Layer = new CALayer();
greenView.Layer.BackgroundColor = NSColor.Green.CGColor;
greenView.Layer.BorderColor = NSColor.Black.CGColor;
greenView.Layer.BorderWidth = 2;
View.AddSubview(greenView);
var redView = new NSView();
redView.Layer = new CALayer();
redView.Layer.BackgroundColor = NSColor.Red.CGColor;
redView.Layer.BorderColor = NSColor.Black.CGColor;
redView.Layer.BorderWidth = 2;
View.AddSubview(redView);
var blueView = new NSView();
blueView.Layer = new CALayer();
blueView.Layer.BackgroundColor = NSColor.Blue.CGColor;
blueView.Layer.BorderColor = NSColor.Black.CGColor;
blueView.Layer.BorderWidth = 2;
View.AddSubview(blueView);
// create the constraints
var padding = 10;
var superview = View;
// basic constraints
greenView.MakeConstraints(make =>
{
make.Top.And.Left.EqualTo(superview).Offset(padding); // chain .Top and .Left
make.Bottom.EqualTo(blueView.Top()).Offset(-padding);
make.Right.EqualTo(redView.Left()).Offset(-padding);
make.Width.EqualTo(redView.Width());
make.Height.EqualTo(redView.Height());
make.Height.EqualTo(blueView.Height());
});
// .With and .And are semantic and optional
redView.MakeConstraints(make =>
{
make.Top.EqualTo(superview.Top()).With.Offset(padding); // with .Width
make.Left.EqualTo(greenView.Right()).Offset(padding); // no .Width
make.Bottom.EqualTo(blueView.Top()).And.Offset(-padding); // with .And
make.Right.EqualTo(superview.Right()).Offset(-padding); // no .And
make.Width.EqualTo(greenView.Width());
make.Height.EqualTo(NSArray.FromNSObjects(new[] { greenView, blueView })); // can pass array of views
});
blueView.MakeConstraints(make =>
{
make.Top.EqualTo(greenView.Bottom()).Offset(padding);
make.Left.EqualTo(superview.Left()).Offset(padding);
make.Bottom.EqualTo(superview.Bottom()).Offset(-padding);
make.Right.EqualTo(superview.Right()).Offset(-padding);
make.Height.EqualTo(NSArray.FromNSObjects(new[] { greenView.Height(), redView.Height() })); // can pass array of attributes
});
// demonstrate update
growingButton = new NSButton();
growingButton.Title = "Grow Me!";
growingButton.Layer = new CALayer();
growingButton.Layer.BackgroundColor = NSColor.White.CGColor;
growingButton.Layer.BorderColor = NSColor.Green.CGColor;
growingButton.Layer.BorderWidth = 3;
View.AddSubview(growingButton);
growingButton.AddGestureRecognizer(new NSClickGestureRecognizer(_ =>
{
buttonSize = new CGSize(buttonSize.Width * 1.3f, buttonSize.Height * 1.3f);
// tell constraints they need updating
View.NeedsUpdateConstraints = true;
// update constraints now
View.UpdateConstraintsForSubtreeIfNeeded();
View.LayoutSubtreeIfNeeded();
}));
// demonstrate remake
movingButton = new NSButton();
movingButton.Title = "Move Me!";
movingButton.Layer = new CALayer();
movingButton.Layer.BackgroundColor = NSColor.White.CGColor;
movingButton.Layer.BorderColor = NSColor.Green.CGColor;
movingButton.Layer.BorderWidth = 3;
View.AddSubview(movingButton);
movingButton.AddGestureRecognizer(new NSClickGestureRecognizer(_ =>
{
topLeft = !topLeft;
// tell constraints they need updating
View.NeedsUpdateConstraints = true;
// update constraints now
View.UpdateConstraintsForSubtreeIfNeeded();
View.LayoutSubtreeIfNeeded();
}));
}