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@Kyle-Ye
Kyle-Ye / CAHostingLayer.md
Last active August 6, 2026 06:28
Using CAHostingLayer in SwiftUI — access SwiftUI's SPI CALayer without Apple internal SDK

Using CAHostingLayer in SwiftUI

Background

SwiftUI provides more than just UIHostingController / _UIHostingView (iOS) and NSHostingController / NSHostingView (macOS) for embedding SwiftUI views into UIKit/AppKit.

Starting from iOS 18.0 / macOS 15.0, SwiftUI also offers CAHostingLayer<Content: View> — a CALayer subclass that can host SwiftUI content directly at the layer level. This API is currently marked as SPI (@_spi(ForUIKitOnly) / @_spi(ForAppKitOnly)) and is used internally by UIKit, AppKit, and WebKit.

Accessing CAHostingLayer without Apple Internal SDK

@ollieatkinson
ollieatkinson / SVG.swift
Last active June 27, 2026 03:45
Utilise the private CoreSVG framework in Swift
import Darwin
import Foundation
import UIKit
// https://github.com/xybp888/iOS-SDKs/blob/master/iPhoneOS17.1.sdk/System/Library/PrivateFrameworks/CoreSVG.framework/CoreSVG.tbd
// https://developer.limneos.net/index.php?ios=17.1&framework=UIKitCore.framework&header=UIImage.h
@objc
class CGSVGDocument: NSObject { }