gistlib - did finish processing photo in swift

To finish processing a photo in Swift, you need to perform the following steps:

Get the image data from the photo. This can be done using the UIImage class.


main.swift
guard let imageData = UIImageJPEGRepresentation(photo, 1) else {
    // Handle error
    return
}
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Create a CGContext from the image data.


main.swift
guard let dataProvider = CGDataProvider(data: imageData as CFData) else {
    // Handle error
    return
}
guard let cgImage = CGImage(jpegDataProviderSource: dataProvider, decode: nil, shouldInterpolate: true, intent: .defaultIntent) else {
    // Handle error
    return
}
guard let context = CGContext(data: nil, width: Int(photo.size.width), height: Int(photo.size.height), bitsPerComponent: cgImage.bitsPerComponent, bytesPerRow: cgImage.bytesPerRow, space: cgImage.colorSpace ?? CGColorSpace(name: CGColorSpace.sRGB)!, bitmapInfo: cgImage.bitmapInfo.rawValue) else {
    // Handle error
    return
}
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Perform the desired image processing on the CGContext.


main.swift
// Example: color inversion
context.translateBy(x: 0, y: CGFloat(photo.size.height))
context.scaleBy(x: 1, y: -1)
context.setBlendMode(.difference)
context.draw(cgImage, in: CGRect(x: 0, y: 0, width: photo.size.width, height: photo.size.height))
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Create a new UIImage from the processed CGContext.


main.swift
guard let processedCGImage = context.makeImage() else {
    // Handle error
    return
}
let processedImage = UIImage(cgImage: processedCGImage)
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Return the processed image using a completion handler.


main.swift
completionHandler(processedImage)
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Putting it all together, the final code might look something like this:


main.swift
func processPhoto(_ photo: UIImage, completionHandler: @escaping (UIImage) -> Void) {
    guard let imageData = UIImageJPEGRepresentation(photo, 1) else {
        // Handle error
        return
    }
    guard let dataProvider = CGDataProvider(data: imageData as CFData) else {
        // Handle error
        return
    }
    guard let cgImage = CGImage(jpegDataProviderSource: dataProvider, decode: nil, shouldInterpolate: true, intent: .defaultIntent) else {
        // Handle error
        return
    }
    guard let context = CGContext(data: nil, width: Int(photo.size.width), height: Int(photo.size.height), bitsPerComponent: cgImage.bitsPerComponent, bytesPerRow: cgImage.bytesPerRow, space: cgImage.colorSpace ?? CGColorSpace(name: CGColorSpace.sRGB)!, bitmapInfo: cgImage.bitmapInfo.rawValue) else {
        // Handle error
        return
    }
    // Perform image processing
    context.translateBy(x: 0, y: CGFloat(photo.size.height))
    context.scaleBy(x: 1, y: -1)
    context.setBlendMode(.difference)
    context.draw(cgImage, in: CGRect(x: 0, y: 0, width: photo.size.width, height: photo.size.height))
    // Convert processed CGContext to UIImage
    guard let processedCGImage = context.makeImage() else {
        // Handle error
        return
    }
    let processedImage = UIImage(cgImage: processedCGImage)
    // Return processed image
    completionHandler(processedImage)
}
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did finish processing photo in swift

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