DTCoreText can't draw underline in iOS18.

[ximmyxiao]

I have wrote a demo like this

- (NSAttributedString*)testContent
{
	NSString* content = @"111";

	NSMutableAttributedString* attri = [[NSMutableAttributedString alloc] initWithString:content];
	[attri addAttributes:@{NSUnderlineStyleAttributeName:@(1),NSUnderlineColorAttributeName:[UIColor redColor],NSForegroundColorAttributeName:[UIColor greenColor]} range:NSMakeRange(0, [content length]) ];

	return [attri copy];
}

and set this content to DTAttributedTextContentView,
the underline will not show in iOS18 beta3 and the newest beta version of Xcode , but it works well in iOS17 and before. seems the CoreText is changed something in underline drawing in iOS18.

more exactly reason can be seem:
here

[daiyangyang945]

Hello, I have the same issue as you, did you solve it

[nicolasmuller]

+1

[ZHK1024]

+1

[ximmyxiao]

@daiyangyang945 @nicolasmuller I found this problem only exist in some beta version of iOS , you guys can check it in the public version of iOS 18.x

[daiyangyang945]

@daiyangyang945 @nicolasmuller I found this problem only exist in some beta version of iOS , you guys can check it in the public version of iOS 18.x

Okay, thank you for your reply

[benjaminbarbe]

@ximmyxiao @daiyangyang945 @nicolasmuller
It's the same issue with the public version 18.1 😔

[ximmyxiao]

@benjaminbarbe , in my iPhone16 pro with iOS18.1 , the underline can be drawn well , But in my iPhone15 pro max with iPhone 18.2 beta and in any simulator with iOS 18 , the underline can't be drawn