In TextKit 1 we have the method NSTextStorage.addLayoutManager(_:) that allows to show the same text in multiple text views. This method exists with NSLayoutManager but not with NsTextLayoutManager.
Is there a way to achieve the same thing with TextKit 2?
Content manager allows to addition one or more layout managers.
let layoutManager = NSTextLayoutManager()
layoutManager.textContainer = textContainer
let contentManager = NSTextContentStorage()
contentManager.addTextLayoutManager(layoutManager)
that you can later assess via contentManager.textLayoutManagers. Additionally there is a flag automaticallySynchronizesTextLayoutManagers (defaults to true) to facilitate synchronization of multiple layout managers for that content manager.
Thanks! I have another question now: how can I link multiple NSTextContentStorage to the same NSTextStorage? The documentation for NSTextContentStorage reads:
By default, the framework initializes the NSTextContentStorage with NSTextStorage as the backing store.
But I don't see any way of accessing or setting the NSTextStorage. If I'm not supposed to do so, then how can I programmatically change the text?
I believe the following sample code has what you are looking for:
Specifically, please see toggleHidden() in TextAttachment.swift for how to change the text storage programmatically.
Best,
——
Ziqiao Chen
Worldwide Developer Relations.
Thanks. The part I was missing is the one the documentation for NSTextContentManager doesn't mention, which is that it is an abstract class whose (apparently) only concrete subclass is NSTextContentStorage, which has a textStorage property.
guard let textStorage: NSTextStorage = (textLayoutManager?.textContentManager as? NSTextContentStorage)?.textStorage else { return }
The sample code also changes the textStorage inside the block passed to textContentManager.performEditingTransaction(_:), which the documentation doesn't seem to explain why it's necessary.