Add Picker project to repo

Picker/PickerViewController.swift

@@ -0,0 +1,63 @@
+//
+//  PickerViewController.swift
+//  Picker
+//
+//  Created by Eryn Wells on 2015-07-23.
+//  Copyright © 2015 Eryn Wells. All rights reserved.
+//
+
+import UIKit
+
+class PickerViewController: UIViewController {
+    var alphabet: [Character] = [] {
+        didSet {
+            if let picker = picker {
+                picker.reloadComponent(0)
+            }
+        }
+    }
+
+    private let pickerMax = 10000
+
+    @IBOutlet private weak var picker: UIPickerView!
+    @IBOutlet private weak var pickerPositionLabel: UILabel!
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        let middle = pickerMax / 2
+        picker.selectRow(middle - (middle % alphabet.count), inComponent: 0, animated: false)
+        updatePositionLabel()
+    }
+
+    private func updatePositionLabel() {
+        self.pickerPositionLabel.text = String(picker.selectedRowInComponent(0) % alphabet.count)
+    }
+
+    @IBAction func advance() {
+        picker.selectRow(picker.selectedRowInComponent(0) + 1, inComponent: 0, animated: true)
+        updatePositionLabel()
+    }
+
+    // MARK: - UIPickerViewDataSource
+
+    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
+        return 1
+    }
+
+    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
+        return pickerMax
+    }
+
+    // MARK: - UIPickerViewDelegate
+
+    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
+        updatePositionLabel()
+    }
+
+    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
+        if alphabet.count == 0 {
+            return nil
+        }
+        return String(alphabet[row % alphabet.count])
+    }
+}