{"id":25457901,"url":"https://github.com/cuadros-code/project-13-swiftui-instafilter","last_synced_at":"2025-11-02T13:30:26.206Z","repository":{"id":275034683,"uuid":"924384797","full_name":"cuadros-code/Project-13-SwiftUI-instafilter","owner":"cuadros-code","description":"SwiftUI instafilter, create filter to 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 InstaFilter\n\n## Understanding how @State works\n\n- @State no almacena el valor en la estructura View, sino en un almacenamiento externo gestionado por SwiftUI.\n- Como View es inmutable, SwiftUI reconstruye la vista en cada actualización de estado, pero el estado persiste en su almacenamiento.\n- didSet solo se ejecuta cuando se modifica una propiedad almacenada en la estructura, pero en el caso de @State, el cambio ocurre en su almacenamiento interno.\n- Para reaccionar a los cambios de @State, debes usar .onChange(of:) en lugar de didSet.\n\n```swift\nimport SwiftUI\n\nstruct ContentView: View {\n    \n    @State private var blurAmount = 0.0 {\n        didSet {\n            print(\"\\(blurAmount)\")\n        }\n    }\n    \n    var body: some View {\n        VStack {\n            Text(\"Hello word!\")\n                .blur(radius: blurAmount)\n            \n            Slider(value: $blurAmount, in: 0...20)\n            \n            Button(\"Random Blur\") {\n                blurAmount = Double.random(in: 0...20)\n            }\n        }\n        .padding()\n    }\n}\n```\n\n## confirmationDialog\n\n```swift\nimport SwiftUI\n\nstruct ContentView: View {\n    @State private var showingConfirmation = false\n    @State private var backgroundColor = Color.white\n    \n    var body: some View {\n        Button(\"Dialog\") {\n            showingConfirmation.toggle()\n        }\n        .frame(width: 300, height: 300)\n        .background(backgroundColor)\n        \n        .confirmationDialog(\"Change background\", isPresented: $showingConfirmation) {\n            Button(\"Red\") { backgroundColor = .red }\n            Button(\"Green\") { backgroundColor = .green }\n            Button(\"Blue\") { backgroundColor = .blue }\n            Button(\"Cancel\", role: .cancel) { }\n        } message: {\n            Text(\"Select a new color\")\n        }\n    }\n}\n```\n\n## Set image Filter\n\n```swift\nimport SwiftUI\nimport CoreImage\nimport CoreImage.CIFilterBuiltins\n\nstruct ContentView: View {\n    \n    @State private var image: Image?\n    @State private var sliderAmount = 1.0\n    \n    var body: some View {\n        VStack {\n            image?\n                .resizable()\n                .scaledToFit()\n        }\n        Slider(value: $sliderAmount, in: -10...1)\n        \n            .onAppear(perform: loadImage)\n            .onChange(of: sliderAmount) {\n                loadImage()\n            }\n    }\n    \n    func loadImage() {\n        let inputImage = UIImage(resource: .example)\n        let beginImage = CIImage(image: inputImage)\n        \n        let contexts = CIContext()\n        let currentFilter = CIFilter.crystallize()\n        currentFilter.inputImage = beginImage\n        \n        let amount = sliderAmount\n        let inputKeys = currentFilter.inputKeys\n        \n        //        currentFilter.intensity = -5\n        if inputKeys.contains(kCIInputIntensityKey) {\n            currentFilter.setValue(amount, forKey: kCIInputIntensityKey)\n        }\n        \n        if inputKeys.contains(kCIInputRadiusKey) {\n            currentFilter.setValue(amount * 200, forKey: kCIInputRadiusKey)\n        }\n        \n        if inputKeys.contains(kCIInputScaleKey) {\n            currentFilter.setValue(amount * 10, forKey: kCIInputScaleKey)\n        }\n        \n        guard let outputImage = currentFilter.outputImage else { return }\n        guard let cgImage = contexts.createCGImage(outputImage, from: outputImage.extent)else {\n            return\n        }\n        let iuImage = UIImage(cgImage: cgImage)\n        image = Image(uiImage: iuImage)\n    }\n    \n     func loadImageFilter() {\n        let inputImage = UIImage(resource: .example)\n        let beginImage = CIImage(image: inputImage)\n        \n        let contexts = CIContext()\n        let currentFilter = CIFilter.sepiaTone()\n        \n        currentFilter.inputImage = beginImage\n        currentFilter.intensity = -5\n\n        guard let outputImage = currentFilter.outputImage else { return }\n        guard let cgImage = contexts.createCGImage(outputImage, from: outputImage.extent) else {\n            return\n        }\n        let iuImage = UIImage(cgImage: cgImage)\n        image = Image(uiImage: iuImage)\n    }\n    \n}\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcuadros-code%2Fproject-13-swiftui-instafilter","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcuadros-code%2Fproject-13-swiftui-instafilter","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcuadros-code%2Fproject-13-swiftui-instafilter/lists"}