Swift：如何从NSTextField连续发送动作

Question

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 ie 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)?

Answer 1

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.