UITextView crash on iOS 18.4 beta

Question

Created Mar ’25

Replies 9

Boosts 2

Views 1.9k

Participants 7

UITextView crash when setting attributed text that contains substring ffi and attributedText contains NSFontAttributeName, NSForegroundColorAttributeName

Reproducible case:

UITextView *textView = [[UITextView alloc] init];

textView.attributedText = [[NSAttributedString alloc] initWithString:@"ffi" attributes:@{ NSParagraphStyleAttributeName: [self createParagraphOfLineHeight:20], NSFontAttributeName: [UIFont systemFontOfSize:fontSize weight:UIFontWeightRegular], NSForegroundColorAttributeName: UIColor.black }];

Boost

Answer 1

darkpaw OP

Mar ’25

You should probably raise this as a bug in the usual way. It won't really get progressed if it's only posted in these Developer Forums.

You need to raise each issue you find separately at https://feedbackassistant.apple.com/ You can post the FB numbers here if you want, so that others can link to them.

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Answer 2

Claude31 OP

Mar ’25

I tested in Swift something similar, without crash on simulator 18.4

           let string = "ffi"
          
          var style = [NSAttributedString.Key.foregroundColor: UIColor.black, NSAttributedString.Key.font: UIFont.systemFont(ofSize: 17, weight: .regular), NSAttributedString.Key.paragraphStyle: NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle]
     
          let attributeString = NSMutableAttributedString(string: string, attributes: style)
          testField.attributedText = attributeString

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Answer 3

DTS Engineer OP

Apple

Mar ’25

@neohoangokg There's not enough here to reproduce the issue.

Could you share a please share a link to a test project that reproduces the issue. That'll help us better understand what's going on. If you're not familiar with preparing a test project, take a look at Creating a test project.

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Answer 4

neohoangokg OP

Mar ’25

hi, here is a project to reproduce the issue: https://github.com/hoangvannghia/ios18.4-crash

FB: https://feedbackassistant.apple.com/feedback/16697708

thanks!

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Answer 5

neohoangokg OP

Mar ’25

Screenshot 2025-03-04 at 6.37.27 PM.png

The stacktrace.

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Answer 6

johannes-plunien-kleinanzeigen OP

Mar ’25

We're also affected by the crash, here's two sample apps that demonstrate it:

https://github.com/plu/UITextViewCrash

FB16604342

Only happens on iOS 18.4 Beta - any other iOS version before that was fine.

1

Answer 7

neohoangokg OP

Mar ’25

In my case it happens on a letter combination that produces a ligature.

Updating the font setting (this is done by our font provider) can help to fix it.
Removing the ligature feature also help to fix it.

But I think there would be something wrong on iOS 18.4, please help to check it.

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Answer 8

dmaclach OP

Apr ’25

We are seeing this as well and seems to be happening on iOS 18.5 beta 1. Going to test on beta 3 asap.

FB17176757

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Answer 9

Goffredo OP

May ’25

Does it persist on Xcode 16.4 Beta 1 and the latest beta iOS release? The release notes are a bit scarce as they fail to mention other fixes such as the URLSession bug fixed in the Simulator.

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	let string = "ffi"

	var style = [NSAttributedString.Key.foregroundColor: UIColor.black, NSAttributedString.Key.font: UIFont.systemFont(ofSize: 17, weight: .regular), NSAttributedString.Key.paragraphStyle: NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle]

	let attributeString = NSMutableAttributedString(string: string, attributes: style)
	testField.attributedText = attributeString