UIPickerViewで入力するTextField

自分用のメモとして。
TextFieldのinputViewにUIPickerViewを設定すればできる。

実装例

自分はUITextFieldのカスタムクラスにして実装した。こうするとUIPickerViewのdelegateを閉じ込められるのですっきりしていい感じ。
minerva1129/PickerTextField

PickerTextField.swift

import UIKit

class PickerTextField: UITextField, UIPickerViewDelegate, UIPickerViewDataSource {
    var dataList = [String]()

    /*
    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func drawRect(rect: CGRect) {
    // Drawing code
    }
    */

    init() {
        super.init(frame: CGRectZero)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    func setup(dataList: [String]) {
        self.dataList = dataList

        let picker = UIPickerView()
        picker.delegate = self
        picker.dataSource = self
        picker.showsSelectionIndicator = true

        let toolbar = UIToolbar(frame: CGRectMake(0, 0, 0, 35))
        let doneItem = UIBarButtonItem(barButtonSystemItem: .Done, target: self, action: Selector("done"))
        let cancelItem = UIBarButtonItem(barButtonSystemItem: .Cancel, target: self, action: Selector("cancel"))
        toolbar.setItems([cancelItem, doneItem], animated: true)

        self.inputView = picker
        self.inputAccessoryView = toolbar
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return dataList.count
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return dataList[row]
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        self.text = dataList[row]
    }

    func cancel() {
        self.text = ""
        self.endEditing(true)
    }

    func done() {
        self.endEditing(true)
    }
}

初期化してsetup()して使う。
こんな感じ。