Internal SF Symbols

readme.md

List of all the images in /Library/Developer/CoreSimulator/Volumes/iOS_21A328/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 17.0.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/SFSymbols.framework/CoreGlyphsPrivate.bundle/Assets.car

Extract using https://github.com/insidegui/AssetCatalogTinkerer etc

ContentView.swift

struct ContentView: View {
    var body: some View {
        let names = [
            ["appstore.app.dashed", "buildings.3d", "emoji.chicken.face"],
            ["person.text.rectangle.and.nfc", "secure.element", "laugh.bubble.tapback.2.he"],
            ["apple.news", "apple.podcasts.square.stack", "apple.slice"],
        ]
        VStack(spacing: 20) {
            Grid(horizontalSpacing: 20, verticalSpacing: 20) {
                ForEach(names, id: \.self) { nameRow in
                    GridRow {
                        ForEach(nameRow, id: \.self) { name in
                            Image(privateSystemName: name)
                                .imageScale(.large)
                                .foregroundStyle(.tint)
                                .tint(Color(hue: .random(in: 0...1), saturation: 1, brightness: 0.7))
                        }
                    }
                }
            }
            Text("Internal SF Symbols")
                .font(.caption)
        }
    }
}

Image+SFSymbols.swift

extension Image {
    init(privateSystemName: String) {
        self.init(uiImage: UIImage(privateSystemName: privateSystemName))
    }
}

PrivateBits.h

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface SFSCoreGlyphsBundle: NSObject
@property (nonatomic, class, readonly) NSBundle *private;
@end

@interface _UIAssetManager : NSObject
+ (instancetype)assetManagerForBundle:(NSBundle *)bundle;
- (UIImage *)imageNamed:(NSString *)name;
@end

@interface UIImage (SFSCoreGlyphsBundle)

- (instancetype)initWithPrivateSystemName:(NSString *)name;

@end

NS_ASSUME_NONNULL_END

PrivateBits.m

#import "SFSymbols.h"

@implementation UIImage (SFCoreGlyphBundle)

- (instancetype)initWithPrivateSystemName:(NSString *)name {
    NSBundle *const bundle = [NSClassFromString(@"SFSCoreGlyphsBundle") private];
    _UIAssetManager *const assetManager = [_UIAssetManager assetManagerForBundle:bundle];
    self = [[assetManager imageNamed:name] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
    return self;
}

@end

There are a few private icons that seem to either be multicolored by default, or have multicolor variants, such as activity.rings.closed, activity.rings.open, or apple.cycletracking.
That last one in particular also has the variants apple.cycletracking.circle and apple.cycletracking.circle.fill.

Is there a way to use the multicolor variants or to use .symbolVariant to derive the circled/filled versions from the base image?

There are a few private icons that seem to either be multicolored by default, or have multicolor variants, such as activity.rings.closed, activity.rings.open, or apple.cycletracking. That last one in particular also has the variants apple.cycletracking.circle and apple.cycletracking.circle.fill.

Is there a way to use the multicolor variants or to use .symbolVariant to derive the circled/filled versions from the base image?

To my knowledge (as I was experimenting a lot with this implementation of private symbols), every type of modification that you’d want to do has to be done via a SymbolConfiguration within the implementation of private symbols, it can’t be done at a SwiftUI view level. The issue is that the only rendering modes you have access to are palette and hierarchical. I don’t believe there’s a way to access the default colors using this method, unfortunately, as the system treats them as generic symbols as if you’ve created them and added them to your app bundle.

If you want to use a SymbolConfiguration to experiment with it a bit, in my Swift rewrite, you can just use:
let symbolConfig = UIImage.SymbolConfiguration(scale: .large) // Use your symbol configuration here and
self.baseImage = baseImage.applyingSymbolConfiguration(symbolConfig)! at the end of the privateSystemName init.

In terms of symbolVariant, it seems easy enough* to write the logic for it manually if you truly wanted to, and I’m planning to make a package to make using private symbols easier in the not-too-distant future.

there is a way.