RoyalVNCKitUI

An iOS rendering and input layer on top of RoyalVNCKit — the cross-platform VNC protocol + macOS framebuffer view from Royal Applications.

RoyalVNCKit ships a macOS NSView-backed framebuffer renderer but no iOS equivalent. RoyalVNCKitUI adds:

• A UIViewController-based framebuffer view backed by a CALayer pipeline (smooth pan/zoom, edge-snap clamps, low-latency cursor redraws).
• Gesture handling — pan, pinch, two-finger tap-as-right-click, modifier keys (Shift sticky, Cmd/Ctrl/Option one-shot).
• A RemoteKeyboardTextField overlay that bridges UIKit text input into raw VNC keyboard events.
• A loading overlay with auto-reconnect grace and a share-sheet affordance.
• An optional in-app performance HUD (FPS, frame-interval jitter, update-to-render latency, CSV export via signposts).

Installation

Embed as a git submodule and reference by path in your app's Package.swift:

.package(path: "Vendor/vncat")

Then depend on the library product:

.product(name: "RoyalVNCKitUI", package: "vncat")

The package has a nested royalvnc submodule pointing at upstream RoyalVNCKit — clone with --recurse-submodules (or run git submodule update --init --recursive after a plain clone).

Platforms

• iOS 15+
• macOS 11+ (RoyalVNCKit's own macOS renderer is used directly; this package's UI layer is iOS-only)

Layout

Sources/RoyalVNCKitUI/iOS/   The UIKit/CALayer rendering layer.
royalvnc/                    Nested submodule: upstream RoyalVNCKit.
Package.swift                Library target definition.

License

See LICENSE. RoyalVNCKit itself is MIT-licensed by Royal Applications — see royalvnc/LICENSE for the upstream terms.