更改 class swift 中的变量值

Question

我有 2 class编辑：Game 和 ViewController（NSViewController 的子class）即 Game class:

class Game {

required init(num : CGFloat, picName : String, gameName : String, description : String, windowHeight : CGFloat) {
    self.number = num
    self.pictureName = picName
    self.name = gameName
    self.desc = description
    self.height = windowHeight
}

var number : CGFloat
var pictureName : String
var name : String
var desc : String
var height : CGFloat

var image : NSImage {
    return NSImage(named: pictureName)!
}

var imageView : NSImageView {
    return NSImageView(frame: NSRect(x: 0, y: height - (110 * (number - 1)) - 100, width: 100, height: 100))
}

var nameField : NSTextField {
    return NSTextField(frame: NSRect(x: 110, y: height - (110 * (number - 1)) - 100, width: 300, height: 30))
}

var descField : NSTextField {
    return NSTextField(frame: NSRect(x: 110, y: height - (110 * (number - 1)) - 140, width: 300, height: 60))
}


func setImage() {
    imageView.image = image
}

func setNameField() {
    nameField.font = NSFont(name: "System", size: 15.0)
    nameField.stringValue = "Name"
    nameField.alignment = NSTextAlignment(rawValue: 2)!
    nameField.selectable = false
    nameField.editable = false
}

func setDescField() {
    descField.selectable = false
    descField.editable = false
    descField.stringValue = desc
    descField.font = NSFont(name: "System", size: 11.0)
}

}

在 viewDidAppear 我这样做：

var size = self.view.window?.frame.size
    var newGame = Game(num: 1, picName: "Bomb.png", gameName: "Bomber", description: "Just a simpla application", windowHeight: size!.height)
    newGame.setDescField()
    newGame.setImage()
    newGame.setNameField()
    println(newGame.descField.editable)
    self.view.addSubview(newGame.imageView)
    self.view.addSubview(newGame.descField)
    self.view.addSubview(newGame.nameField)

并且descField.editable总是true，即使我在classGame中的函数中写了descField.editable = false。如何解决？

Answer 1

按照您编写代码的方式，每次访问 nameField 时都会生成一个新的 NSTextField 实例，依此类推。

您想使用惰性实例化，通过添加 'lazy' 关键字即可轻松支持：

lazy var nameField : NSTextField {
     return NSTextField(frame: NSRect(x: 110, y: height - (110 * (number - 1)) - 100, width: 300, height: 30))
 }

或者更简单：

lazy var nameField = NSTextField(frame: NSRect(x: 110, y: height - (110 * (number - 1)) - 100, width: 300, height: 30))

对图像、imageView 和 descField 执行相同的操作。

Answer 2

这样怎么样：

var descField = NSTextField(frame: NSRect(x: 110, y: height - (110 * (number - 1)) - 140, width: 300, height: 60))
var editable: Bool {
    get {
        return descField.editable
    }
    set {
        descField.editable = newValue
    }
}

您可以使用您的游戏实例：

var newGame //......
newGame.editable = true

Answer 3

我找到了解决方案。您需要将所有字段和图像视图声明为惰性变量并在 init:

中使用它们

import Foundation
import Cocoa
import AppKit

class Game {

init(num : CGFloat, picName : String, gameName : String, description : String, windowHeight : CGFloat, sender : NSViewController) {
    self.number = num
    self.pictureName = picName
    self.name = gameName
    self.desc = description
    self.height = windowHeight
    imageView = NSImageView(frame: NSRect(x: 0, y: 0, width: 100, height: 100))
    nameField = NSTextField(frame: NSRect(x: 110, y: 60, width: 300, height: 30))
    descField = NSTextField(frame: NSRect(x: 110, y: 0, width: 300, height: 60))

    nameField.font = NSFont(name: "System", size: 15.0)
    nameField.stringValue = self.name
    nameField.alignment = NSTextAlignment(rawValue: 2)!
    nameField.selectable = false
    nameField.editable = false
    nameField.backgroundColor = sender.view.window?.backgroundColor
    nameField.bordered = false

    descField.selectable = false
    descField.editable = false
    descField.stringValue = desc
    descField.font = NSFont(name: "System", size: 11.0)
    descField.backgroundColor = NSColor.controlColor()
    descField.bordered = true
    descField.backgroundColor = sender.view.window?.backgroundColor

    imageView.image = NSImage(named: self.pictureName)!

    gameView = NSView(frame: NSRect(x: 0, y: /*height - (100 * num)*/ height - (120 * num), width: 600, height: 100))

    button = NSButton(frame: NSRect(x: 0, y: 0, width: 600, height: 100))
    button.tag = Int(number)
    button.action = nil

    var gesture = NSClickGestureRecognizer(target: sender, action: Selector("buttonPressed:"))
    gesture.numberOfClicksRequired = 1
    gesture.buttonMask = 0x1
    button.addGestureRecognizer(gesture)

    button.bezelStyle = NSBezelStyle(rawValue: 6)!
    button.transparent = true

    gameView.addSubview(nameField)
    gameView.addSubview(imageView)
    gameView.addSubview(descField)
    gameView.addSubview(button)

}

var number : CGFloat
var pictureName : String
var name : String
var desc : String
var height : CGFloat

lazy var button : NSButton = NSButton()
lazy var imageView : NSImageView = NSImageView()
lazy var nameField : NSTextField = NSTextField()
lazy var descField : NSTextField = NSTextField()
lazy var gameView : NSView = NSView()

}

然后你这样称呼这一切：

var newGame = Game(num: number, picName: "Bomb2.png", gameName: "Bomber", description: "Just a simple application", windowHeight: size!.height, sender: self)
self.view.addSubview(newGame.gameView)

更改 class swift 中的变量值

Change values of variables in class swift

class

cocoa

swift

class-variables

xcode-6.2