Question

NSTextView does word-wrap by default. How can I disable this?
I’m making a JSON code viewer, so I have to disable this.

Answer 1

First, this document explains why and how — https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/TextStorageLayer/Tasks/TrackingSize.html#//apple_ref/doc/uid/20000927-CJBBIAAF

I got solution from: http://lists.apple.com/archives/cocoa-dev/2008/May/msg02396.html

You have to set NSTextView’s maximum width to very large number to make this work correctly. (Just copy maximum height)
And enable horizontal scrolling of NSScrollView which is superview of the NSTextView.
See these pictures:

http://www.flickr.com/photos/47601728@N06/4759470529/

http://www.flickr.com/photos/47601728@N06/4759470533/

Update

I discovered my old sample code was insufficient to make it fully work correctly. (because of SDK version?)
Also
Here’s my full source code snippet which disables word-wrap in OSX 10.8 SDK.

[self setMaxSize:CGSizeMake(FLT_MAX, FLT_MAX)];    
[self setHorizontallyResizable:YES];               
[[self textContainer] setWidthTracksTextView:NO];  
[[self textContainer] setContainerSize:CGSizeMake(FLT_MAX, FLT_MAX)];  

Update 2

Now Apple is providing an official guide to create NSTextView correctly. I hope this helps.

Update 3

I posted an example project on Github. See this page for specific implementation: https://github.com/Eonil/CocoaProgrammaticHowtoCollection/blob/master/ComponentUsages/TextView/ExampleApplicationController.swift?ts=4

Here’s a code snippet from the sample project.

if wordWrap {
    /// Matching width is also important here.
    let sz = scrollView.contentSize
    textView.frame = CGRect(x: 0, y: 0, width: sz.width, height: 0)
    textView.textContainer?.containerSize = CGSize(width: sz.width, height: CGFloat.greatestFiniteMagnitude)
    textView.textContainer?.widthTracksTextView = true
}
else {
    textView.textContainer?.widthTracksTextView = false
    textView.textContainer?.containerSize = CGSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude)
}