Swift 中检测按键事件

Swift 中检测按键事件

swift
override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    becomeFirstResponder()
}

swift
override var keyCommands: [UIKeyCommand]? {
    return [
        UIKeyCommand(input: "\r", modifierFlags: [], action: #selector(enterKeyPressed))
    ]
}
@objc func enterKeyPressed() {
    // 处理回车键按下事件的代码
}

swift
import UIKit
class ViewController: UIViewController {
    @IBOutlet weak var textField: UITextField!
    override func viewDidLoad() {
        super.viewDidLoad()
        textField.becomeFirstResponder()
    }
    override var keyCommands: [UIKeyCommand]? {
        return [
            UIKeyCommand(input: "\r", modifierFlags: [], action: #selector(enterKeyPressed))
        ]
    }
    @objc func enterKeyPressed() {
        if let text = textField.text {
            print("用户输入的文本是：\(text)")
        }
    }
}