【SwiftUI】画像の明度・彩度・コントラストを調整するサンプルアプリを作ってみた

struct ContentView: View {
    @State var brightness = 0.0
    @State var satur = 1.0
    @State var contrast = 1.0
    
    private func clear() {
        self.brightness = 0.0
        self.satur = 1.0
        self.contrast = 1.0
    }
    
    var body: some View {
        VStack {
            Image("pasta")
                .resizable()
                .scaledToFit()
                .padding(.bottom)
                .brightness(brightness)
                .saturation(satur)
                .contrast(contrast)
            
            VStack(alignment: .leading) {
                Text("明度\(brightness)")
                Slider(value: $brightness, in: -0.5...0.5)
            }.padding()
            
            VStack(alignment: .leading) {
                Text("彩度\(satur)")
                Slider(value: $satur, in: 0...2)
            }.padding()
            
            VStack(alignment: .leading) {
                Text("コントラスト\(contrast)")
                Slider(value: $contrast, in: 0.5...2)
            }.padding()
            
            Button(action: {
                self.clear()
            }) {
                Text("元に戻す")
            }
        }
    }
}