keydown不工作swift [英] keyDown doesn't work swift

问题描述

这是我的代码：

override func keyDown(theEvent: NSEvent) {
    super.keyDown(theEvent)
    switch theEvent.character {
    case NSLeftArrowFunctionKey:
        println(1)
    case NSRightArrowFunctionKey:
        println(2)
    case NSDownArrowFunctionKey:
        println(3)
    case NSUpArrowFunctionKey:
        println(4)
    default:
        break
    }
}

正如你所看到的，我尝试识别是否按下了一个箭头按钮，但它从来不工作。即使函数keyDown似乎也不会被调用。

As you can see, I try to recognize if one of arrow buttons was pressed, but it never works. Even the function keyDown never seems to be called.

这是写在 viewDidAppear ，如果这可以帮助你提供答案：

That's what is written in viewDidAppear, if this can help you to provide the answer:

override func viewDidAppear() {
    super.viewDidAppear()
    self.view.window?.styleMask = NSClosableWindowMask | NSMiniaturizableWindowMask | NSTitledWindowMask
    var frame = self.view.window?.frame
    var newHeight = CGFloat(438)
    var newWidth = CGFloat(415)
    frame?.size = NSMakeSize(newWidth, newHeight)
    self.view.window?.setFrame(frame!, display: true)
    self.view.window?.backgroundColor = NSColor.darkGrayColor()
}

在 viewDidLoad 我只是添加一些不可选，可编辑的NSTextFields：

In viewDidLoad I just add some non-selectable and non-editable NSTextFields like that:

var x = CGFloat(0)
    var y = CGFloat(0)
    var tag = 1

    for var i = 0; i < 4; i++ {
        for var j = 0; j < 4; j++ {
            var tile = NSTextField(frame: NSRect(x: x, y: y, width: 100, height: 100))
            tile.enabled = false
            tile.stringValue = ""
            tile.font = NSFont(name: "Helvetica", size: 75)
            tile.backgroundColor = NSColor.lightGrayColor()
            tile.editable = false
            tile.selectable = false
            tile.drawsBackground = true
            tile.alignment = NSTextAlignment(rawValue: 2)!
            tile.tag = tag
            x += 105
            ar.append(tile)
            self.view.addSubview(tile)
            tag++
        }
        x = 0
        y += 105
    }

为什么 keyDown 不起作用，所以我非常感谢任何帮助。

I just have no idea why keyDown doesn't work, so I'll really appreciate any help.

/ strong>

整个类代码：

import Cocoa
import AppKit
import Foundation

class _048Main: NSViewController {

var ar : Array<NSTextField> = []
var left = 0

var dict : Dictionary<Int, NSColor> = [:]

var pic2 = NSColor.redColor()
var pic4 = NSColor.whiteColor()
var pic8 = NSColor.orangeColor()
var pic16 = NSColor.magentaColor()
var pic32 = NSColor()
var pic64 = NSColor()
var pic128 = NSColor()
var pic256 = NSColor() // Some colors will be added
var pic512 = NSColor()
var pic1024 = NSColor()
var pic2048 = NSColor()


override func viewDidLoad() {
    super.viewDidLoad()

    dict[2] = pic2
    dict[4] = pic4
    dict[8] = pic8
    dict[16] = pic16
    dict[32] = pic32
    dict[64] = pic64
    dict[128] = pic128
    dict[256] = pic256
    dict[512] = pic512
    dict[1024] = pic1024
    dict[2048] = pic2048

    var x = CGFloat(0)
    var y = CGFloat(0)
    var tag = 1

    for var i = 0; i < 4; i++ {
        for var j = 0; j < 4; j++ {
            var tile = NSTextField(frame: NSRect(x: x, y: y, width: 100, height: 100))
            tile.enabled = false
            tile.stringValue = ""
            tile.font = NSFont(name: "Helvetica", size: 75)
            tile.backgroundColor = NSColor.lightGrayColor()
            tile.editable = false
            tile.selectable = false
            tile.drawsBackground = true
            tile.alignment = NSTextAlignment(rawValue: 2)!
            tile.tag = tag
            x += 105
            ar.append(tile)
            self.view.addSubview(tile)
            tag++
        }
        x = 0
        y += 105
    }
    left = 16
    generateTile()
    generateTile()
}

func generateTile() {
    var r = Int(arc4random_uniform(UInt32(left)))
    var tmp = 0
    for var i = 0; i < 16; i++ {
        if ar[i].stringValue == "" {
            if tmp == r {
                var t = Int(arc4random_uniform(10))
                switch t {
                case 0...1:
                    ar[i].stringValue = "2"
                    ar[i].backgroundColor = pic2
                default:
                    ar[i].stringValue = "4"
                    ar[i].backgroundColor = pic4
                }
                left--
                break
            }
            tmp++
        }
    }
}

override func viewDidAppear() {
    super.viewDidAppear()
    self.view.window?.styleMask = NSClosableWindowMask | NSMiniaturizableWindowMask | NSTitledWindowMask
    var frame = self.view.window?.frame
    var newHeight = CGFloat(438)
    var newWidth = CGFloat(415)
    frame?.size = NSMakeSize(newWidth, newHeight)
    self.view.window?.setFrame(frame!, display: true)
    self.view.window?.backgroundColor = NSColor.darkGrayColor()
}


override func keyDown(theEvent: NSEvent) {
    super.keyDown(theEvent)
    switch theEvent.character {
    case NSLeftArrowFunctionKey:
        println(1)
    case NSRightArrowFunctionKey:
        println(2)
    case NSDownArrowFunctionKey:
        println(3)
    case NSUpArrowFunctionKey:
        println(4)
    default:
        super.mouseDown(theEvent)
    }
}

}

推荐答案

你只需要使用一个看不见的按钮。首先在窗口中添加一个方形按钮。分配所需的密钥。使你的按钮宽0像素，高0像素。

You just need to use an invisible button. First add a square button to your window. assign the desired key for it. make your button 0 pixels wide and 0 pixels height. Add an IBAction to your button and the code to be executed when the user press the key.

另一个选项是addLocalMonitorForEventsMatchingMask以获取更多信息查看此链接

Another option is to addLocalMonitorForEventsMatchingMask for more info check this link

http://stackoverflow.com/a/32447474/2303865

这篇关于keydown不工作swift的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！