Swift:如何从 NSTextField 连续发送动作 [英] Swift: How to continuously send an action from a NSTextField

问题描述

我有一个 NSTextField 并且想在用户更改值时发送一个操作.我在 Interface Builder 中检查了Continuous"(它在 NSSlider 中工作正常)，但是 NSTextField 只有在我不聚焦时才会发送他的动作.如何从 NSTextField 连续发送动作(使用 Swift)?

解决方案

将文本域的委托设置为应该接收动作并实现的类

func controlTextDidChange(_ obj: NSNotification)

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当控件中的文本(例如文本字段或形式变化.控件发布一个 NSControlTextDidChangeNotification通知，如果控件的委托实现了这个方法，它自动注册以接收通知.使用钥匙@"NSFieldEditor" 从userInfo获取字段编辑器通知对象字典.

I have a NSTextField and want to send an action whenever the user changes the value. I checked "Continuous" in the Interface Builder (which works i.e. fine with NSSlider), but the NSTextField only sends his action if I unfocus it. How can I continuously send an action from a NSTextField (using Swift)?

解决方案

Set the delegate of the text field to the class which is supposed to receive the action and implement

func controlTextDidChange(_ obj: NSNotification)

This method is invoked when text in a control such as a text field or form changes. The control posts a NSControlTextDidChangeNotification notification, and if the control’s delegate implements this method, it is automatically registered to receive the notification. Use the key @"NSFieldEditor" to obtain the field editor from the userInfo dictionary of the notification object.

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