如何快速捕获NSControl上的一些事件 [英] How to catch some events on a NSControl in swift

问题描述

我正在Swift中为OSX编写一个应用程序，我正在寻找一种捕捉NSControl事件的好方法. 显然，我进行了搜索，但发现的信息通常不清楚或过旧. 以我为例，我想在NSTextField上捕获几个事件(键输入，文本更改，焦点丢失等).

I am writing an application for OSX in Swift and I am looking for a good way to catch events on a NSControl. Obviously, I searched but the informations I found are often unclear or old. In my case, I would like to catch several events on a NSTextField (key up, text changed, focus lost,...).

当我在NSTextField中按下"Enter"时，它会发送一个动作.当我单击或在NSTextField中书写时，也许有一种发送动作的方法吗?

When I push on "Enter" in the NSTextField, it sends an action. Maybe is there a way to send an action when I click or write in the NSTextField?

推荐答案

您可以将NSTextField子类化，并覆盖textDidChange进行文本更改，重写textDidEndEditing以获得丢失的焦点，并使用keyUp方法进行举起.尝试这样:

You can subclass NSTextField and override textDidChange for text change, textDidEndEditing for lost focus and keyUp method for key up. Try like this:

import Cocoa

class CustomTextField: NSTextField {
    override func viewWillMove(toSuperview newSuperview: NSView?) {
        // customize your field here
        frame = newSuperview?.frame.insetBy(dx: 50, dy: 50) ?? frame
    }
    override func textDidChange(_ notification: Notification) {
        Swift.print("textDidChange")
    }
    override func textDidEndEditing(_ notification: Notification) {
        Swift.print("textDidEndEditing")
    }
    override func keyUp(with event: NSEvent) {
        Swift.print("keyUp")
    }
}

View Controller示例用法:

View Controller sample Usage:

import Cocoa
class ViewController: NSViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let textField = CustomTextField()
        view.addSubview(textField)
    }
}

示例

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