NSAttributedString changed font unexpectedly after inserting Image

Question

I am using Text Kit in iOS 7 to create a rich text editor. Following is the problem.

At first, then font size is 16:

Answer 1

This is apparently a bug. Here is a workaround I found. Adding the correct font attributes one more time after inserting image will fix it.

self.contentTextView.textStorage.addAttributes(self.contentTextView.typingAttributes, range: mEditingRange)