CODEWITHSUNDEEP
swift3nsattributedstringsuperscriptxcode8-beta6ios10.3
Huy Nguyen
Huy Nguyen

Reputation: 51

Swift 3.1 - NSSuperScript in NSAttributedString not working as expected

The application I am working on encountered an issue when testing with iOS 10.3 Simulator via XCode 8.3 beta 2, where the superscript in AttributedString displayed on the same line with normal text. For iOS 10.2.x and below, it is displaying correctly.

iOS 10.3 screenshot: https://www.dropbox.com/s/p5v71g722cg5qhy/Screen%20Shot%202017-02-21%20at%2010.24.21%20AM.png?dl=0

iOS 10.2.x and below screenshot: https://www.dropbox.com/s/lcfsic6xyz953qp/Screen%20Shot%202017-02-21%20at%2010.19.17%20AM.png?dl=0

Here's how I handled the text:

<html>  
<head>  
     <style> body { color: #554344 ; font-family: \'MyCustomFont\'; font-size: 18px; } sup { font-size: 13px; } </style>  
</head>  
<body>  
     ABCdef<sup>1,2,3,8,9</sup>  
</body>  
</html>  

private func convertHTMLToAttributedString(string: String) -> NSAttributedString {  
       guard let data = string.data(using: String.Encoding.utf16, allowLossyConversion: false) else { return NSAttributedString() }  
       return try! NSAttributedString(  
           data: data,  
           options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],  
           documentAttributes: nil)  
   } 

1,2,3,8,9{  
   NSColor = "kCGColorSpaceModelRGB 0.333333 0.262745 0.266667 1 ";  
   NSFont = "<UICTFont: 0x7fed0a469880> font-family: \"MyCustomFont\"; font-weight: normal; font-style: normal; font-size: 10.00pt";  
   NSKern = 0;  
   NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 13/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";  
   NSStrokeColor = "kCGColorSpaceModelRGB 0.333333 0.262745 0.266667 1 ";  
   NSStrokeWidth = 0;  
   NSSuperScript = 1;  
}

Note: I thought the issue was related to our custom font, but the issue still happen when we use the default font.

Is this an issue related with Swift 3.1 and should be fixed?

Upvotes: 1

Views: 926

Answers (1)

rshev
rshev

Reputation: 4186

We found that it's an issue in UILabel's attributed text rendering in iOS 10.3, not Swift 3.1-related. Affected strike-through style for us.

For our specific scenario (we have all attributes specified in NSAttributedString, not using UILabel's properties) this is the solution:

/// This UILabel subclass accomodates conditional fix for NSAttributedString rendering broken by Apple in iOS 10.3
final class PriceLabel: UILabel {

    override func drawText(in rect: CGRect) {
        guard let attributedText = attributedText else {
            super.drawText(in: rect)
            return
        }

        if #available(iOS 10.3, *) {
            attributedText.draw(in: rect)
        } else {
            super.drawText(in: rect)
        }
    }
}

Upvotes: 1

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