# SwiftIOSLearning

## * CODE POUR CHANGEMENT DE COULEUR
<code>
import SwiftUI
import Combine

struct ContentView: View {
    @State private var color: Color = .white
    
    var body: some View {
        ZStack {
            color
            VStack {
                Image("Image1")
                    .resizable()
                    .aspectRatio(contentMode: .fit)
                    .frame(height: 200)
                    .onReceive(Just(UIImage(named: "Image1"))) { uiImage in
                        if let averageColor = uiImage?.averageColor {
                            self.color = Color(averageColor)
                        }
                    }
                    .scaledToFit()
                    .clipShape(RoundedRectangle(cornerRadius: 20))
                    .overlay(RoundedRectangle(cornerRadius: 20)
                                .stroke(Color.gray, lineWidth: 2))
                Spacer()
            }
            .padding(EdgeInsets.init(top: 32, leading: 12, bottom: 12, trailing: 12))
        }
    }
    struct ContentView_Previews: PreviewProvider {
        static var previews: some View {
            ContentView()
        }
    }
}

extension UIImage {
    var averageColor: UIColor? {
        guard let inputImage = CIImage(image: self) else { return nil }
        let extent = inputImage.extent
        let context = CIContext(options: nil)
        let ciFilter = CIFilter(name: "CIAreaAverage", parameters: [kCIInputImageKey: inputImage, kCIInputExtentKey: CIVector(cgRect: extent)])!
        var bitmap = [UInt8](repeating: 0, count: 4)
        context.render(ciFilter.outputImage!, toBitmap: &bitmap, rowBytes: 4, bounds: CGRect(x: 0, y: 0, width: 1, height: 1), format: .RGBA8, colorSpace: nil)
        return UIColor(red: CGFloat(bitmap[0]) / 255, green: CGFloat(bitmap[1]) / 255, blue: CGFloat(bitmap[2]) / 255, alpha: 1.0)
    }
</code>