drawHierarchy broken - image too bright

Question

Created Apr ’24

Replies 3

Boosts 0

Participants 2

extension UIView {
    func takeSnapshot(rect : CGRect? = CGRect.zero) -> UIImage? {
        let renderer = UIGraphicsImageRenderer(size: frame.size)
        var image = renderer.image { _ in drawHierarchy(in: bounds, afterScreenUpdates: true) }
        if let imageRect = rect, imageRect != CGRect.zero {
            let screenshotFrame = CGRect(x: imageRect.origin.x * UIScreen.main.scale, y: imageRect.origin.y * UIScreen.main.scale, width: imageRect.size.width * UIScreen.main.scale, height: imageRect.size.height * UIScreen.main.scale)
            let imageRef = image.cgImage!.cropping(to: screenshotFrame)
            image = UIImage.init(cgImage: imageRef!, scale: image.scale, orientation: image.imageOrientation)
        }
        UIGraphicsEndImageContext()
        return image
    }
}

which was working fine until I updated to macOS 14.4.1 from 14.2.1 and to Xcode 15.3 from 15.0.

issue

From my Mac Catalyst app, if I try to take screenshot of imageView, the screenshot is brighter.

If I try this method it seems working:

func takeSnapshotWithoutScale()  -> UIImage? {
    UIGraphicsBeginImageContextWithOptions(self.frame.size, false, 0)
    if let currentContext = UIGraphicsGetCurrentContext() {
        self.layer.render(in: currentContext)
    }
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return newImage
}

Boost

Answer 1

Prashant_7 OP

Apr ’24

I have prepared the demo

you can run in mac catalyst app to reproduce

https://github.com/PrashantKT/ImageViewScreenShotIssue

0

Answer 2

Prashant_7 OP

May ’24

@Apple Could you pl. help me it's been 2 weeks i am stuck in this

0

Answer 3

dvachisla OP

Jul ’24

Hi, Prashant_7. replace this category in your code:

extension UIView {
    func takeSnapshot() -> UIImage? {
        let renderer = UIGraphicsImageRenderer(size: frame.size)
        let image = renderer.image { _ in drawHierarchy(in: bounds, afterScreenUpdates: true) }
        
        UIGraphicsEndImageContext()
        return image
    }
}

with this one:

extension UIView {
    func takeSnapshot() -> UIImage? {
        let format = UIGraphicsImageRendererFormat()
        format.preferredRange = .standard
        let renderer = UIGraphicsImageRenderer(size: frame.size, format: format)
        let image = renderer.image { _ in drawHierarchy(in: bounds, afterScreenUpdates: true) }
        
        UIGraphicsEndImageContext()
        return image
    }
}

0