Swift NSAttributedString with foregroundColor crash app.

Question

I have the next func to draw a string in a view using Core Graphics with swift 5.3 in Catalina.

Code Block private func drawString(_ string : String, at point : CGPoint, withFont font : NSFont, andColor color : NSColor )
 {
    let attributes : [NSAttributedString.Key : Any] = [NSAttributedString.Key.font : font, NSAttributedString.Key.foregroundColor : color.cgColor]
    let attStr = NSAttributedString(string:string, attributes:attributes)
    attStr.draw(at:point)
}

When the app draw the string (line 8) the app crash, and in the Xcode.debug area I read:
2020-10-21 10:17:34.535356-0500 MyApp[15037:1374731] -[__NSCFType set]: unrecognized selector sent to instance 0x60000214ef80
If remove the foregroundColor att, the app runs, but the string is drawing in black.

Some Suggestion.
Thanks
Manuel C.

1.7k

Posted by

ManuelCSolis

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Answer 1

it appears that the problem is to use cgColor.

This works for me:

Code Block private func drawString(_ string : String, at point : CGPoint, withFont font : NSFont, andColor color : NSColor )
 {
    let attributes : [NSAttributedString.Key : Any] = [NSAttributedString.Key.font : font, NSAttributedString.Key.foregroundColor : color]
    let attStr = NSAttributedString(string:string, attributes:attributes)
    attStr.draw(at:point)
}

If you use .cgcolor, then you have to add the backgroundColor attribute to avoid crash.
But nothing draws !

Posted by

Claude31

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Answer 2

it appears that the problem is to use cgColor.

This works for me:

Code Block private func drawString(_ string : String, at point : CGPoint, withFont font : NSFont, andColor color : NSColor )
 {
    let attributes : [NSAttributedString.Key : Any] = [NSAttributedString.Key.font : font, NSAttributedString.Key.foregroundColor : color]
    let attStr = NSAttributedString(string:string, attributes:attributes)
    attStr.draw(at:point)
}

If you use .cgcolor, then you have to add the backgroundColor attribute to avoid crash.
But nothing draws !

Posted by

Claude31

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Answer 3

Yes. Correct. The cuestión here is that in swift, all core graphics objects and strucks are CG(CGPoint, CGSize, CGFloat, CGColor, etc), and all drawXXXXmethos use only CG...objects, types and structs. I asume (incorrectly) that drawString... uses a CGColor, but not, it use a NSColor.

Thanks. :)

Posted by

ManuelCSolis

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Swift NSAttributedString with foregroundColor crash app.

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