HappyAutoLayout

Terse, readable and safe auto-layout F# DSL for Xamarin iOS.

Write your constraints like this:

mainView.AddConstraints(
  [ Mirror(happyView, Top, mainView)
    Relate(happyView, Left, Equal, mainView, Left, Times(0.8f), AddZero)
    Relate(happyView, Right, Equal, mainView, Right, Times(0.5f), Add(10.0f))
    Set(happyView, Bottom, Equal, 250.0f) ])

Or this:

// Use the HappyLayout module function edgeConstraints, to create the 4 constraints I need.
mainView.AddConstraints(Hal.edgeConstraints happyView mainView)

Constraint Types

There are three constraint types:

Relate fully expresses a constraint relationship between the properties of two views.

Mirror specifies that a view property should mirror the value of the same property on the second view. You could specify this with Relate, but Mirror is shorter and clearly expresses your intent.

Set directly specifies the value of a property on the view.

Using HappyAutoLayout

Grab HappyAutoLayout.fs and put it in your F# iOS project.

HAL could be used from C# too. Add an F# assembly project and this file and build away. I might try it too one day, or you could just join us in F# land. It's so warm and fuzzy here.

Contact

@bentayloruk

License

HappyAutoLayout is licensed under MIT.

Dragon Information

HappyAutoLayout is at 0.1. It is a tiny bit of code, so don't let that worry you.