Svg image download from url

Kingfisher+Svg.swift

//
//  Kingfisher+Svg.swift
//  Created by Saish Chachad on 23/06/22.
//  


import UIKit
import Kingfisher
import PocketSVG

// Convert SVG images from Server to UIImage
struct SVGProcessor: ImageProcessor {
    
    // `identifier` should be the same for processors with the same properties/functionality
    // It will be used when storing and retrieving the image to/from cache.
    let identifier = "svgprocessor"
    var size: CGSize!
    init(size: CGSize) {
        self.size = size
    }
    
    // Convert input data/image to target image and return it.
    func process(item: ImageProcessItem, options: KingfisherParsedOptionsInfo) -> UIImage? {
        switch item {
        case .image(let image):
            return image
        case .data(let data):
            if let svgString = String(data: data, encoding: .utf8) {
                let path = SVGBezierPath.paths(fromSVGString: svgString)
                let layer = SVGLayer()
                layer.paths = path
                let frame = CGRect(x: 0, y: 0, width: size.width, height: size.height)
                layer.frame = frame
                let img = self.snapshotImage(for: layer)
                return img
            }
            return nil
        }
    }
    
    // Get actual image
    func snapshotImage(for view: CALayer) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, UIScreen.main.scale)
        guard let context = UIGraphicsGetCurrentContext() else { return nil }
        view.render(in: context)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

// For SVG rendering only
extension UIImageView {
    
    /// Use this function for downloading SVG image from URL
    /// - Parameters:
    ///   - url: SVG image url
    ///   - processor: SVG Image Processor
    func svgImage(from url: URL?, processor: SVGProcessor) {
        guard let url = url else {
            self.image = nil
            return
        }
        
        KingfisherManager.shared.retrieveImage(with: url, options: [.processor(processor), .forceRefresh]) {  result in
            switch result {
            case .success(let value):
                DispatchQueue.main.async {
                    self.image = value.image
                }
            case .failure(let error):
                print("Image download fail:\(error.localizedDescription)")
            }
        }
    }
}

TableViewCell.swfit

//
//  TableViewCell.swift
//  Created by Saish Chachad on 10/06/22.
//  

import UIKit

final class TableViewCell: UITableViewCell {
    // MARK: Outlets
    @IBOutlet private weak var imgView: UIImageView!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }
    
    /// Set Data
    func setData(_ data: urlString) { 
     // Send image size here
     let processor = SVGProcessor(size: CGSize(width: 17, height: 17))
     imgView.svgImage(from: URL(string: urlString), processor: processor)
    }
}

2023-04-13 10:51:26.829605+0800 FootballInfomation[32055:1334276] *** Assertion failure in hexTriplet::hexTriplet(NSString *__strong)(), SVGEngine.mm:904
2023-04-13 10:51:26.830488+0800 FootballInfomation[32055:1334276] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: [str hasPrefix:@"#"]'
*** First throw call stack:
(0x1816dbc80 0x198f00ee4 0x182e81de0 0x1044d6bac 0x1044d3d68 0x1044d2fe4 0x1044d5608 0x1044d1f74 0x1043de174 0x104457bc8 0x104457878 0x104479504 0x1043ebf74 0x1061ac700 0x1061adfc8 0x1061b5150 0x1061b5ddc 0x1061c163c 0x1dca40e10 0x1dca4093c)
libc++abi: terminating with uncaught exception of type NSException
dyld4 config: DYLD_LIBRARY_PATH=/usr/lib/system/introspection DYLD_INSERT_LIBRARIES=/Developer/usr/lib/libBacktraceRecording.dylib:/Developer/usr/lib/libMainThreadChecker.dylib:/Developer/Library/PrivateFrameworks/DTDDISupport.framework/libViewDebuggerSupport.dylib
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: [str hasPrefix:@"#"]'
terminating with uncaught exception of type NSException

Thanks a lot! It is really very helpfull!

This code works excellent with svgs, that have viewBox parameter starting with "0 0 ... ", for example viewBox="0 0 80 80".
But it displays not correctly svgs with viewBox like this: viewBox="-40 -40 80 80".
Link example of such svg: https://upload.wikimedia.org/wikipedia/commons/1/17/Yin_yang.svg

Perhaps you could help me to remake this code for working well with any variation of viewBox?

Thanks a lot! You saved my day:)