Hands-On Design Patterns with Swift

Using model controllers

Just as we have controllers dedicated to managing views—the view controllers—you should consider using controllers to help communicate with complex model layers. Code bases that suffer from Massive View Controller syndrome often exhibit the following pathologies in their view controllers:

• Network calls, logic, and parsing
• Caches, data stores, or Core Data logic
• Business logic or validators

Let's first start with an interface for a message composer that exhibits Massive View Controller syndrome:

class MassiveViewController : UIViewController {        var textView = UITextView()    var sendButton = UIButton()    override func viewDidLoad() {        super.viewDidLoad()        /* layout the views */        /* design the views */    } func sendTapped(sender: ...