A UITextField is used to enter a character.
Class Hierarchy of UITextField
NSObject
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UIResponder.
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UIView.
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UIControl
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UITextField
AppleDeveloper Reference UITextField
UITextField Example Sentence
UITextField, generate and, when the button is pressed, take a string from the UITextField and copy it to a label.
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| import UIKit | |
| class ViewController: UIViewController, UITextFieldDelegate { | |
| private var myTextField: UITextField! | |
| private var myLabel: UILabel! | |
| private var myButton: UIButton! | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| // UITextFieldの作成 | |
| myTextField = UITextField() | |
| //大きさと位置の指定 | |
| myTextField.frame = CGRect(x: 50, y: 50, width: 200, height: 50) | |
| // 表示する文字を代入する | |
| myTextField.text = "myTextField" | |
| // Delegate設定 | |
| myTextField.delegate = self | |
| // 枠を表示する. | |
| myTextField.borderStyle = UITextBorderStyle.roundedRect | |
| // クリアボタンを追加. | |
| myTextField.clearButtonMode = .whileEditing | |
| // Viewに追加する | |
| self.view.addSubview(myTextField) | |
| //入力された文字を表示するラベル | |
| //UILabelの作成 | |
| myLabel = UILabel() | |
| myLabel.frame = CGRect(x: 50, y: 100, width: 200, height: 50) | |
| myLabel.text = "empty" | |
| self.view.addSubview(myLabel) | |
| //TextFieldの文字列を取得する | |
| myButton = UIButton() | |
| myButton.frame = CGRect(x: 50, y: 150, width: 200, height: 50) | |
| myButton.addTarget(self, action: #selector(buttonClicked(sender:)), for:.touchUpInside) | |
| myButton.setTitle("入力テキスト取得", for: UIControlState.normal) | |
| myButton.backgroundColor = UIColor.gray | |
| self.view.addSubview(myButton) | |
| } | |
| //UITextFieldが編集された前に呼ばれる | |
| func textFieldDidBeginEditing(_ textField: UITextField) { | |
| print("textFieldDidBeginEditing: \(textField.text!)") | |
| } | |
| //UITextFieldが編集された後に呼ばれる | |
| func textFieldDidEndEditing(_ textField: UITextField) { | |
| print("textFieldDidEndEditing: \(textField.text!)") | |
| } | |
| //改行ボタンが押された際に呼ばれる | |
| func textFieldShouldReturn(_ textField: UITextField) -> Bool { | |
| print("textFieldShouldReturn \(textField.text!)") | |
| // 改行ボタンが押されたらKeyboardを閉じる処理. | |
| textField.resignFirstResponder() | |
| return true | |
| } | |
| //ボタンが押されたら、テキストフィールドから値を取得する | |
| internal func buttonClicked(sender: UIButton){ | |
| myLabel.text = myTextField.text | |
| } | |
| } |