Strikethrough style is not rendered in iOS 14

UI Frameworks UIKit
haldun-gh OP
Created Aug ’20
Replies 17
Boosts 0
Views 5.9k
Participants 13
I'm trying to use replaceCharacters(in:with:) of NSMutableAttributedString to replace a substring and apply different attributes. The problem is strikethroughStyle is not rendered for that substring.

Code Block swift
let s = NSMutableAttributedString(
    string: "hello world!",
    attributes: [.foregroundColor: UIColor.label]
)
let range = s.mutableString.range(of: "world")
s.replaceCharacters(
    in: range,
    with: NSAttributedString(
        string: "mars",
        attributes: [
            .strikethroughStyle: NSUnderlineStyle.single.rawValue,
            .strikethroughColor: UIColor.systemRed,
            .foregroundColor: UIColor.systemRed,
        ]
    )
)


Here, I can see that the color of the substring "mars" is changed, but there is no strikethrough line.

The same code is successfully working for iOS 13.

Replies  17
Boosts  0
Views  5.9k
Participants  13
eliperkins OP
Aug ’20
I've submitted FB8351249 related to this as well!
0
eliperkins OP
Aug ’20
Seems that there is another report of this in FB8201732 too.
0
DTS Engineer OP
Apple
Aug ’20
Is this a rendering problem or an attributed string problem? That is, if you enumerate each range of contiguous attributes using enumerateAttributes(in:options:using:), do you see the string through set?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"
0
haldun-gh OP
Aug ’20
It seems like a rendering problem. I can see the strikethroughStyle, and strikethroughColor attributes attached to the substring "mars" when I enumerate.
1
DTS Engineer OP
Apple
Aug ’20

It seems like a rendering problem.

OK. That puts it somewhat outside of my bailiwick, but I’ve added the UIKit tag to the thread and I hope that’ll attract the attention of someone more au fait with rendering.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"
1
prashpukale OP
Aug ’20
The issue seems to be happening when adding attributes to a part of the string. It seems to be working fine for striking through complete strings.
Also, enumerateAttributes(in:options:using:) has the strike through attributes. So looks like a rendering issue.
0
perfectionaq OP
Sep ’20
Apparently this issue gets fixed by setting the baselineOffset attribute to 1 (add the attribute to the list of attributes)
4
Claude31 OP
Sep ’20
Just a test you could make.

Try replacing
Code Block 
.strikethroughStyle: NSUnderlineStyle.single.rawValue,

with
Code Block 
NSAttributedString.Key.strikethroughStyle: : NSUnderlineStyle.single.rawValue,

0
akyl OP
Sep ’20
@perfectionaq's answer worked, but is not desirable for obvious reasons. I tried explicitly setting the baslineOffset to 0 and that worked perfectly without any side effects.
1
thegdgteer OP
Sep ’20
I had a similar strikethrough rendering issue and while it's not fixed in the latest, 14.0 GM, it is fixed in 12.2 Beta 1.
0
arise OP
Sep ’20
Actually it is even enough to add baselineOffset and set it to 0

Code Block 
attributedString.addAttribute(NSAttributedString.Key.baselineOffset, value: 0, range: NSMakeRange(0,length))


1
Misteral OP
Sep ’20
Are we expecting Apple to fix this? I have this problem in 6 different applications and I can't go through all of them for a simple issue like this. Specially because this is only displayed on iOS 14.
0
DTS Engineer OP
Apple
Sep ’20

Are we expecting Apple to fix this?

Have you tested your apps on the current 14.2 beta seed?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"
1
isaac-weisberg-at-disrapp OP
Sep ’20
Experiencing the very same issue, compiled with Xcode 11.2.1, running on iOS 14 release version, the baselineOffset workaround doesn't appear to help.
0
isaac-weisberg-at-disrapp OP
Sep ’20
We have managed to work around the issue using baselineOffset: 0.
2
Strikethrough style is not rendered in iOS 14
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