如何实时检查NSTextField-Swift OS X [英] How to live check a NSTextField - Swift OS X

问题描述

我目前正在制作用Swift编写的OS X应用程序.我想做的是，当用户在NSTextField中输入文本时，我想运行一个检查值并将其添加到Label的函数.我将如何迅速做到这一点?

I am currently making an OS X application written in Swift. What I want to do is when the user enters text in a NSTextField, I want to run a function that checks the value and adds it to a Label. How would I do this in swift?

推荐答案

1. 使ViewController符合协议NSTextDelegate.
2. 将ViewController指派为TextField的代表.

3. 实施controlTextDidChange方法.

1. Conforms ViewController to protocol NSTextDelegate.
2. Assign ViewController as Delegate for TextField.

3. Implement controlTextDidChange method.

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate, NSTextFieldDelegate {

    @IBOutlet weak var window: NSWindow!
    @IBOutlet weak var textField: NSTextField!
    @IBOutlet weak var label: NSTextField!


    func applicationDidFinishLaunching(aNotification: NSNotification)
    {
        textField.delegate = self
    }

    override func controlTextDidChange(notification: NSNotification)
    {
        let object = notification.object as! NSTextField
        self.label.stringValue = object.stringValue
    }

    func applicationWillTerminate(aNotification: NSNotification) {
        // Insert code here to tear down your application
    }
}

在ViewController中:

in ViewController:

import Cocoa

class ViewController: NSViewController, NSTextDelegate {

   @IBOutlet weak var label: NSTextField!
   @IBOutlet weak var label2: NSTextField!
   @IBOutlet weak var textField: NSTextField!
   @IBOutlet weak var textField2: NSTextField!

   override func viewDidLoad() {
      super.viewDidLoad()
   }

   override func controlTextDidChange(notification: NSNotification) {
      if let txtFld = notification.object as? NSTextField {
         switch txtFld.tag {
         case 201:
            self.label.stringValue = txtFld.stringValue
         case 202:
            self.label2.stringValue = txtFld.stringValue
         default:
            break
         }
      }
   }
}

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