editable nstextview from interface builder

问题

I'm unable get to edit an nstextview. Here is the steps I tried.

From the interface builder, I dragged dropped a "Custom view" into another view. (I couldnt find a nstextview there.)
I changed the class of the Custom view form "NSView" to "NSTextView"
Next I run my project, I can see the text view getting rendered (the mouse cursor changed to text-mode on the mouse-hover of text view area)
However, I have not been able to insert/type/edit any text.

Note: I have tried setEditable, setSelectable & set firstResponder options recommended in other posts, which did not help.

回答1:

The problem is that the textStorage is not set up correctly on the NSTextView when you use Interface Builder in the way described.

I too wanted to use an NSTextView, without scrollView, in InterfaceBuilder. In Xcode 10 it doesn't seem possible to put a lone NSTextView in some custom view hierarchy (earlier answers have hinted that this was possible: https://stackoverflow.com/a/2398980/978300).

It is possible to get this working with the "CustomView" method in the question - however, this will only have the simple NSView properties in the Attributes inspector (i.e. you won't be able to customise font etc). You could pass some details through using @IBInspectable on your custom class.

The Connections Inspector seems to work correctly.

Example NSTextView subclass...

class MyTextView: NSTextView
{
    // init(frame: sets up a default textStorage we want to mimic in init(coder:
    init() {
        super.init(frame: NSRect.zero)
        configure()
    }

    /*
     It is not possible to set up a lone NSTextView in Interface Builder, however you can set it up
     as a CustomView if you are happy to have all your presentation properties initialised
     programatically. This initialises an NSTextView as it would be with the default init...
     */
    required init(coder: NSCoder) {
        super.init(coder: coder)!

        let textStorage = NSTextStorage()
        let layoutManager = NSLayoutManager()
        textStorage.addLayoutManager(layoutManager)

        // By default, NSTextContainers do not track the bounds of the NSTextview
        let textContainer = NSTextContainer(containerSize: CGSize.zero)
        textContainer.widthTracksTextView = true
        textContainer.heightTracksTextView = true

        layoutManager.addTextContainer(textContainer)
        replaceTextContainer(textContainer)

        configure()
    }

    private func configure()
    {
        // Customise your text here...
    }
}

来源：https://stackoverflow.com/questions/46349302/editable-nstextview-from-interface-builder

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swift

macos

nstextview