Cirrious.FluentLayout makes iOS Auto Layout... fun! Especially in F#.

PhotoViewController.fs

open System
open MonoTouch.UIKit
open Cirrious.FluentLayouts.Touch

type PhotoViewController() =
    inherit UIViewController()

    let imageViewSize = 200.0f
    let imageView =
        let view = UIImageView(
            BackgroundColor = UIColor.Gray,
            ContentMode = UIViewContentMode.ScaleAspectFit,
            TranslatesAutoresizingMaskIntoConstraints = false)
        view

    let photoButton =
        let button = UIButton(
            UIButtonType.System,
            TranslatesAutoresizingMaskIntoConstraints = false)
        button.SetTitle("Add photo", UIControlState.Normal)
        button

    let content =
        let view = UIView(BackgroundColor = UIColor.White)

        view.AddSubviews(imageView, photoButton)
        view.AddConstraints [|
            imageView.Width().EqualTo(imageViewSize)
            imageView.Height().EqualTo(imageViewSize)
            imageView.WithSameCenterX(view)
            imageView.AtTopOf(view, 50.0f)
            photoButton.WithSameCenterX(view)
            photoButton.Below(imageView, 20.0f)
        |]
        view

    override this.LoadView() = this.View <- content