Old Label text remains in some instances

Question

Created Apr ’21

Replies 4

Boosts 0

Participants 2

I have a NSlabel that changes text, font and colour periodically.

Occasionally the old text will remain in the label a bit like a watermark. The new text will be displayed on top.

I think old label text is remaining in the memory somehow, I have tried setting the label back to empty before adding the new text but that didn’t stop the problem.

any help would be greatly appreciated.

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Answer 1

Claude31 OP

Apr ’21

Is it Swift UIKit or SwiftUI ?

Did you try calling

Code Block func setNeedsDisplay(NSRect)

on the frame of the label ?

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Answer 2

RyanJohn OP

May ’21

Hello,

Thanks for your response.
Im using SwiftUI and I have called that function with the below line of code.

view.setNeedsDisplay(viewSize)

where viewSize is a NSRect.

I think maybe it has something to do with the text colour as I am using a 'patterImage'. Maybe it's possible that the old patternImage is remaining in memory in some instances however im not sure how I can isolate that. It happens maybe one in 50 times the text is changed.

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Answer 3

Claude31 OP

May ’21

Could you show the code where you set patternImage ?

Also look here to see if replacing with .tile solves the problem
https://stackoverflow.com/questions/60749545/swiftui-cant-create-color-by-uicolorpatternimage

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Answer 4

RyanJohn OP

May ’21

let gradientNumber = Int.random(in: 0..<gradients.count)
let selectedGradient = gradients[gradientNumber]
selectedGradient?.size = .init(width: screenWidth, height: screenHeight)

label.textColor = NSColor (patternImage: selectedGradient!)
view.setNeedsDisplay(viewSize)

This is the code that applies the text colour, .tile wouldn't work properly because it's a gradient not a flat colour.

cheers.

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