Code for Intermediate Core Data: Stage 1 - Video 2

PhotoListController.swift

// Camera Button Customization

button.setTitle("Camera", forState: .Normal)
button.tintColor = .whiteColor()
button.backgroundColor = UIColor(red: 254/255.0, green: 123/255.0, blue: 135/255.0, alpha: 1.0)

button.addTarget(self, action: #selector(PhotoListController.presentImagePickerController), forControlEvents: .TouchUpInside)

// Camera Button Layout

view.addSubview(cameraButton)
cameraButton.translatesAutoresizingMaskIntoConstraints = false

NSLayoutConstraint.activateConstraints([
    cameraButton.leftAnchor.constraintEqualToAnchor(view.leftAnchor),
    cameraButton.bottomAnchor.constraintEqualToAnchor(view.bottomAnchor),
    cameraButton.rightAnchor.constraintEqualToAnchor(view.rightAnchor),
    cameraButton.heightAnchor.constraintEqualToConstant(56.0)
])

Updated for Swift 3:

// Camera Button Customization
let button = UIButton(type: .system)
button.setTitle("Camera", for: .normal)
button.tintColor = UIColor.white
button.backgroundColor = UIColor(red: 254/255.0, green: 123/255.0, blue: 135/255.0, alpha: 1.0)
        
button.addTarget(self, action: #selector(PhotoListController.presentImagePickerController), for: .touchUpInside)

// Camera Button Layout

view.addSubview(cameraButton)
cameraButton.translatesAutoresizingMaskIntoConstraints = false
        
NSLayoutConstraint.activate([
    cameraButton.leftAnchor.constraint(equalTo: view.leftAnchor),
    cameraButton.bottomAnchor.constraint(equalTo: view.bottomAnchor),
    cameraButton.rightAnchor.constraint(equalTo: view.rightAnchor),
    cameraButton.heightAnchor.constraint(equalToConstant: 56.0)
])