Question

我正在创建一个仅使用正确日期的TextField。现在，当我在我的UITextField所在的同一个ViewController类中使用文本字段委托和操作方法时，它工作正常。但是，我必须使它像一个可重用的组件，可以通过拖放在任何项目中使用。我有两个文件 - MakeDate.swift和ViewController.swift

MakDate.swift -

import Foundation
import UIKit


class MakeDate: NSObject, UITextFieldDelegate {

    var textField: UITextField!
    var string: String!
    var viewController: UIViewController!
    let characterset = NSCharacterSet(charactersInString: "0123456789")

    init?(textField: UITextField!) {
        self.textField = textField

    }

    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {

        self.string = string

        return true
    }

    func takeProperDateInput() {
        textField.addTarget(textField, action: #selector(self.textChange(_:)), forControlEvents: .EditingChanged)

    }

    @IBAction func textChange(sender: UITextField) {

        print("\(sender.text!)")

        print("\(sender.text!) && \(self.string)")

        if self.string == "" {
            if sender.text?.characters.count == 2 {
                let index = sender.text?.endIndex.advancedBy(-2)
                sender.text = sender.text?.substringToIndex(index!)
            }
            else if sender.text?.characters.count == 5 {
                let index = sender.text?.endIndex.advancedBy(-2)
                sender.text = sender.text?.substringToIndex(index!)
            }
        }
        if sender.text?.characters.count == 1 && self.string != "" {
            if self.string.rangeOfCharacterFromSet(characterset.invertedSet) != nil {
                let index = sender.text?.endIndex.advancedBy(-1)
                sender.text = sender.text?.substringToIndex(index!)
            }
            else if Int(sender.text!) != 1 && Int(sender.text!) != 0 {
                sender.text = "0" + sender.text! + "/"
            }
        }
        else if sender.text?.characters.count == 2 && self.string != "" {
            if Int(string) != 1 && Int(string) != 2 && Int(string) != 0{
                let index = sender.text?.endIndex.advancedBy(-1)
                sender.text = sender.text?.substringToIndex(index!)
            }else {
                sender.text = sender.text! + "/"
            }
        }
        else if sender.text?.characters.count == 4 && self.string != "" {
            if self.string.rangeOfCharacterFromSet(characterset.invertedSet) != nil {
                let index = sender.text?.endIndex.advancedBy(-1)
                sender.text = sender.text?.substringToIndex(index!)
            }
        }
        else if sender.text?.characters.count == 5 && self.string != "" {
            if self.string == "/" {
                var yearComponent = sender.text?.componentsSeparatedByString("/")
                let index = sender.text?.endIndex.advancedBy(-2)
                sender.text = sender.text?.substringToIndex(index!)
                sender.text = sender.text! + "0" + yearComponent![1] + "/"
            }else {
                var yearComponent = sender.text?.componentsSeparatedByString("/")
                if Int(yearComponent![1]) > 31 {
                    let index = sender.text?.endIndex.advancedBy(-1)
                    sender.text = sender.text?.substringToIndex(index!)
                }else if Int(yearComponent![1]) > 0 && Int(yearComponent![1]) < 32 {
                    sender.text = sender.text! + "/"
                }else {
                    let index = sender.text?.endIndex.advancedBy(-1)
                    sender.text = sender.text?.substringToIndex(index!)
                }
            }
        }
        else if sender.text?.characters.count == 10 && self.string != "" {
            let index = sender.text?.endIndex.advancedBy(-4)
            if sender.text?.substringFromIndex(index!).rangeOfCharacterFromSet(characterset.invertedSet) != nil {
                let index = sender.text?.endIndex.advancedBy(-4)
                sender.text = sender.text?.substringToIndex(index!)
            } else {
                var yearComponent = sender.text?.componentsSeparatedByString("/")
                if Int(yearComponent![2]) == 0 {
                    let index = sender.text?.endIndex.advancedBy(-4)
                    sender.text = sender.text?.substringToIndex(index!)
                }
            }
        }
        else if sender.text?.characters.count > 10 && self.string != "" {
            let index = sender.text?.endIndex.advancedBy(-1)
            sender.text = sender.text?.substringToIndex(index!)
        }

    }


}

和ViewController.swift -

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var dateInsert: UITextField!
    var dateMaker: MakeDate!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib. 
        dateMaker = MakeDate(textField: self.dateInsert)
        self.dateInsert.delegate = self.dateMaker
        self.dateMaker.takeProperDateInput()
    }

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


}

我得到的错误是unrecognized selector sent to instance

Answer 1

使用默认属性创建一个textfield类，并在视图控制器中实现而不是nsobject，以将textfield作为参数发送：

class baseTextfield: UITextField, UITextFieldDelegate {


}

class ViewController: UIViewController{

    @IBOutlet weak var dateInsert: UIBaseTextField!
}

属性属于文本字段，而不属于视图。

触发另一个快速类的动作

1 个答案: