Using a non-zero hyphenationFactor in a NSParagraphStyle for an NSAttributedString can cause a crash when using sizeThatFits:

Originator:dlreese
Number:rdar://16304280 Date Originated:2014-03-12
Status:Open Resolved:
Product:iOS SDK Product Version:iOS 6.1, 7.0 and 7.1
Classification:Crash/Hang/Data Loss Reproducible:Sometimes
 
I'm repeatedly calling sizeThatFits: on an NSAttributedString that has a paragraph style with a non-zero hyphenationFactor. It doesn't always crash, even under identical use, but it crashes fairly often on iOS 6.1, 7.0 and 7.1.

I have attached a sample project. Just start the app in the Simulator, and tap the Start button repeatedly. Will eventually crash in both the Simulator and on a device.

No crash.

Crash about 10% ~ 20% of the time.

iOS Simulator, iPad 3, iPad mini, iPad 2, iPad 4

iOS 6.1.3, 7.0, 7.0.2, 7.0.3, 7.0.4, 7.0.6, 7.1

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