iOS 26.1 crash when inserting a newline at the end of the buffer.

[migueldeicaza]

What happened?

If you press "Return" at the end of the buffer in iOS 26.1 beta (23B82) you get a crash triggered by Apple's WritingTools not expecting a nil return from text(in:):

https://gist.github.com/migueldeicaza/82b3d5833b20286b80caf6a3ff2fb7ce

The code there is not coping well with a nil return, so my solution was to return an empty string if the request was out of range, rather than returning nil

diff --git a/Sources/Runestone/TextView/Core/StringView.swift b/Sources/Runestone/TextView/Core/StringView.swift
index d00356e..15ee2cb 100644
--- a/Sources/Runestone/TextView/Core/StringView.swift
+++ b/Sources/Runestone/TextView/Core/StringView.swift
@@ -51,7 +51,7 @@ final class StringView {
         if range.location >= 0 && range.upperBound <= internalString.length && range.length > 0 {
             return internalString.substring(with: range)
         } else {
-            return nil
+            return ""
         }
     }
 

What are the steps to reproduce?

Press return at the end of the text buffer in the Example.

What is the expected behavior?

Not crash

[groovygay]

Same issue, seems to have a few triggers. I’m also seeing it occasionally when pasting text, and (rarely) with a triple tap to select a whole line.

[groovygay]

Same issue, seems to have a few triggers. I’m also seeing it occasionally when pasting text, and (rarely) with a triple tap to select a whole line.

…but the issue seems to be resolved in iPadOS 26.2