斯威夫特 3 | Xcode 8 datePicker 更新 UItextField

Question

此代码允许您使用 datePicker 为 Xcode 7 更新 textField，但是当我尝试在 Xcode 8 和 Swift 3 中实现它时，应用程序崩溃并在 AppDelegate.swift 文件中引发 SIGABRT 错误。我检查了我所有的@IB，没有任何需要删除的杂项连接。任何指导将不胜感激。

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {
    @IBOutlet var eventStartText: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        eventStartText.delegate = self

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: TextField Delegate
    func datePickerChanged(sender: UIDatePicker) {
        let formatter = DateFormatter()
        formatter.dateStyle = .full
        eventStartText.text = formatter.string(from: sender.date)

        print("Try this at home")
    }

    func textFieldDidBeginEditing(_ textField: UITextField) {
        let datePicker = UIDatePicker()
        textField.inputView = datePicker
        datePicker.addTarget(self, action: (Selector(("datePickerChanged:"))), for: .valueChanged)

        print("This Worked")
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        eventStartText.resignFirstResponder()
        return true
    }

    // MARK: Helper Methods
    func closekeyboard() {
        self.view.endEditing(true)
    }

    // MARK: Touch Events
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        closekeyboard()
    }

    /*
     // MARK: - Navigation

     // In a storyboard-based application, you will often want to do a little preparation before navigation
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
     // Get the new view controller using segue.destinationViewController.
     // Pass the selected object to the new view controller.
     }
     */
}

Answer 1

问题在于 selector 语法，从 Swift 3 开始，您需要在 selector 中指定第一个参数名称，因此请像这样更改您的 selector 语法。

datePicker.addTarget(self, action: #selector(datePickerChanged(sender:)), for: .valueChanged)