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Enable two preset filters on FilterableImage
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| // | ||
| // FilterableImage.swift | ||
| // PlasticBullet | ||
| // | ||
| // Created by Christopher Wallace on 5/19/20. | ||
| // Copyright © 2020 Zinc Collective, LLC. All rights reserved. | ||
| // | ||
|
|
||
| import SwiftUI | ||
|
|
||
| struct Filter { | ||
| let filterName: String | ||
| var filterEffectValue: Any? | ||
| var filterEffectValueName: String? | ||
|
|
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| init(filterName: String, filterEffectValue: Any?, filterEffectValueName: String?) { | ||
| self.filterName = filterName | ||
| self.filterEffectValue = filterEffectValue | ||
| self.filterEffectValueName = filterEffectValueName | ||
| } | ||
| } | ||
|
|
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| struct FilterableImage: View { | ||
| @Binding var selectedImage: UIImage? | ||
| @State var processedImage: UIImage? | ||
|
|
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| // CORE IMAGE FILTERS REFERENCE: "https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/uid/TP40004346-Reference" | ||
| @State var sepia: Filter = Filter(filterName: "CISepiaTone", filterEffectValue: 0.95, filterEffectValueName: kCIInputIntensityKey) | ||
| @State var gaussianBlur: Filter = Filter(filterName: "CIGaussianBlur", filterEffectValue: 20, filterEffectValueName: kCIInputRadiusKey) | ||
|
|
||
| var body: some View { | ||
| Image(uiImage: self.processedImage!) | ||
| .resizable() | ||
| .scaledToFit() | ||
| .border(Color.red, width: 4) | ||
| .onTapGesture(perform: {self.updateFliterableImageView()}) | ||
| .onAppear(perform: setStartImageState) | ||
| } | ||
|
|
||
| func updateFliterableImageView() -> Void { | ||
| print("tapped on a FliterableImageView") | ||
| self.gaussianBlur.filterEffectValue = 50 | ||
| self.processedImage = self.processImage(image: self.processedImage!, filterEffect: self.gaussianBlur) | ||
| } | ||
|
|
||
| func setStartImageState() -> Void { | ||
| print("setStartImageState()") | ||
| self.processedImage = self.processImage(image: self.selectedImage!, filterEffect: self.gaussianBlur) | ||
| } | ||
|
|
||
| func processImage(image: UIImage, filterEffect: Filter) -> UIImage { | ||
| print("starting proc image") | ||
| return applyFilterTo(image: image, filterEffect: filterEffect) | ||
| } | ||
|
|
||
| func applyFilterTo(image: UIImage, filterEffect: Filter) -> UIImage { | ||
| let context = CIContext() | ||
| let filter = CIFilter(name: filterEffect.filterName) | ||
| filter?.setValue(filterEffect.filterEffectValue!, forKey: filterEffect.filterEffectValueName!) | ||
| filter?.setValue(CIImage(image: image), forKey: kCIInputImageKey) | ||
| guard let output = filter?.outputImage else { | ||
| return image | ||
| } | ||
| return UIImage(cgImage: context.createCGImage(output, from: output.extent) ?? image as! CGImage) | ||
| } | ||
| } | ||
| // | ||
| //struct FilterableImage_Previews: PreviewProvider { | ||
| // static var previews: some View { | ||
| // FilterableImage(selectedImage: .constant(UIImage(imageLiteralResourceName: "160421-IMG_5876-"))) | ||
| // } | ||
| //} |
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