Add iOS/ipadOS support - #957
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- sdl.zig: route iOS through SDL's callback-loop path (same as macOS/Windows) instead of the blocking main()/SDL_PollEvent loop. On iOS, SDL_PollEvent is what pumps UIKit_PumpEvents, so the first paint happened before UIKit had laid out the view/drawable, producing a black screen. - ios-example main.zig: run dvui's shared demo/gallery app (dvui.Examples.demo) instead of a static "Hello" label, matching the android-example pattern. - xcode-project: add the zig-project side (build.zig, main.zig) and the xcodegen project.yml/Info.plist/main.c that the Xcode project is generated from; the .xcodeproj itself is generated on demand by tools/build-apple/run-sim.sh, not committed. Verified on iPhone 16 Pro Simulator: rebuilt the simulator static lib, rebuilt the Xcode project, installed and launched, and confirmed via screenshot that the full demo app renders correctly.
Replace the .path dependency on vendor/sdl3-ios (a patched copy of the SDL3
fork with an .ios build.zig case hand-added) with a fetched dependency on
nat3Github/lib-sdl3-dev-fork's ios-support branch, which carries the same
patch. linkSdl3 no longer special-cases which sdl3 dependency to use per
target -- one dependency covers every target, iOS included -- and exposes
the SDL3 static lib + headers via a new installIosSdl3() helper so the iOS
example's build.zig doesn't need its own sdl3 dependency.
Add tools/build-apple/{build_apple.zig,run-sim.sh}, wiring a `zig build
run-sdl3-ios` step (macOS host only) that builds the Xcode project and boots
it in a Simulator.
Fix a UBSan runtime-not-bundled link failure this surfaced: on iOS, Xcode's
linker (not zig) links the app's static lib against SDL3's separately-built
static lib, so a default sanitize_c (full in Debug) leaves libSDL3.a with
__ubsan_handle_* symbols zig never bundled a runtime for. Every other target
links through zig itself, which bundles ubsan into the one binary, so this
is iOS-only -- turn sanitize_c off for iOS in linkSdl3's sdl3 dependency and
addDvuiModule's own C sources (stb_image).
Verified end-to-end: `zig build run-sdl3-ios` builds, installs, and launches
the demo app in an iPhone simulator.
SDL_StartTextInput unconditionally re-applies text input properties on every call, which on iOS tears the hidden UITextField out of the view hierarchy and re-adds it. sdl.zig called it every frame while a field had focus, thrashing the keyboard so it never settled into view. Only call through on an actual rect change now, mirroring the existing cursor_last dedup. Also stop rendering every CADisplayLink tick unconditionally on iOS; throttle using dvui's own wait_event_micros instead, while still responding immediately to real input events. Add UIApplicationSupportsIndirectInputEvents to the example Info.plist so trackpad/mouse input works when a pointer is attached (e.g. iPad).
Owner
|
This is awesome, and I'm trying to verify it using the simulator on my mac, but hitting this error ("could not find a scheme"): Any ideas? |
Collaborator
Author
what comes up if you run apparently my xcode setup is different from yours, xcodegen created the project but without scheme and my xcodebuild had no issue with that. |
Owner
This is confusing - I get: Some searching suggests I need to do: After that: Looks like my xcode version I'm good with you merging this, we'll have to wait for someone else to verify it. Thank you! |
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towards #953
note: support enabled via sdl3 in this branch https://github.com/nat3Github/lib-sdl3-dev-fork (which is pinned in .zon)
xcode is required and a mac of course.
update 2:
ive gotten it to run on my iphone SE2 device, (open xcode project, setup credentials, connect/setup iphone and click play),
update 3:
it works also on my iPad device (note: iphone/ipad developer mode has to be enabled for testing, but its mainly friction less using the xcode app)
todo: