NSCoder

notesFromDavid.swift

/**
 required init?(coder aDecoder: NSCoder) {
 fatalError("init(coder:) has not been implemented")
 }
*/
​
​
import UIKit
​
// Dealing with having to override init(coder:)
​
let frame = CGRect(x: 0, y: 0, width: 320, height: 460)
​
/// 1. First, an example of NSCoder Implementation in Swift.
​
class IAmCoder : UIView {
    
    private var _title : String
    
    init(frame: CGRect, title: String) {
        _title = title
        super.init(frame: frame)
    }
​
    required init?(coder aDecoder: NSCoder) {
        _title = aDecoder.decodeObjectForKey("banana") as! String
        super.init(coder: aDecoder)
    }
    
    override func encodeWithCoder(aCoder: NSCoder) {
        aCoder.encodeObject(self._title, forKey: "banana")
        super.encodeWithCoder(aCoder)
    }
    
}
​
let iamcoderView = IAmCoder(frame: frame, title: "I am a coder")
iamcoderView.backgroundColor = UIColor.redColor()
​
let iamcoderData = NSKeyedArchiver.archivedDataWithRootObject(iamcoderView)
let iamcoderNewInstance = NSKeyedUnarchiver.unarchiveObjectWithData(iamcoderData)
​
// A better way to do this? With convenience initalizers
​
class IAmConvenientCoder : UIView {
    
    private var _title : String = String()
    
    convenience init(frame: CGRect, title: String) {
        self.init(frame: frame)
        self._title = title
    }
}
​
​
let conv = IAmConvenientCoder(frame: frame, title: "Convenient Coder")
conv.backgroundColor = UIColor.greenColor()
let iamconvData = NSKeyedArchiver.archivedDataWithRootObject(conv)
let unarchivedConv = NSKeyedUnarchiver.unarchiveObjectWithData(iamconvData)
​
​
// Dependency Injection with XIB / Storyboards
​
protocol ViewControllerDelegate {
    
    var title : String { get }
}
​
class StoryboardViewController : UIViewController {
    
    @IBInspectable var dataSource : ViewControllerDelegate?
    
    
    convenience init(delegate : ViewControllerDelegate, color: UIColor) {
        self.init(nibName: nil, bundle: nil)
        self.dataSource = delegate
        self.view.backgroundColor = color
    }
    
    override func viewDidLoad() {
        self.view.backgroundColor = UIColor.blueColor()
        print("ViewDidLoad")
        self.title = self.dataSource?.title
    }
}
​
struct DataModel : ViewControllerDelegate {
    
    var title  : String {
        
        return "Hi Jabari"
    }
}
​
let model = DataModel()
let controller = StoryboardViewController(delegate: model, color: UIColor.purpleColor())
controller.dataSource = model
​
let window = UIWindow(frame: frame)
window.rootViewController = controller
window.makeKeyAndVisible()
print(controller.title!)








//Being Testable
​
class TestView : UIView {
    
    var delegate : ViewControllerDelegate?
    private var textLabel : UILabel = UILabel()
    
    
    required convenience init(frame : CGRect, color: UIColor?) {
        self.init(frame: frame)
        self.backgroundColor = color
    }
}
​
extension TestView {
    
    convenience init(test: ViewControllerDelegate) {
        
        self.init(frame: CGRect(x: 0, y: 0, width: 320, height: 360), color: UIColor.redColor())
        self.delegate = test
        testTheTitle()
    }
    
    func testTheTitle() -> Void {
        
        self.textLabel.text = self.delegate?.title
        print(self.textLabel.text)
        print(self.delegate!.title)
        print(assert(self.textLabel.text == self.delegate!.title))
    }
}
​
let test = TestView(test: model)