A Swift wrapper around gtk-3.x and gtk-4.x that is largely auto-generated from gobject-introspection. This project tries to make gtk more "swifty" than using the plain C language interface. For up to date (auto-generated) reference documentation, see https://rhx.github.io/SwiftGtk/
What is new?
Experimental support for gtk 4 was added via the
Version 12 of gir2swift pulls in PR#10, addressing several issues:
- Improvements to the Build experience and LSP rhx/SwiftGtk#34
- Fix issues with LLDB rhx/SwiftGtk#39
- Controversial: Implicitly marks all declarations named "priv" as if they had attribute
- Prevents all "Private" records from generating unless generated in their instance record
-aoption generates all records
- Introduces CI
- For Class metadata types no longer generates class wrappers. Ref structs now contain static method which returnes the GType of the class and instance of the Class metatype wrapped in the Ref struct.
- Adds final class GWeak where T could be any Ref struct of a type which supports ARC. This class is a property wrapper which contains weak reference to any instance of T. This is especially beneficial for capture lists.
- Adds support for weak observation.
- Constructors and factories of GObjectInitiallyUnowned classes now consume floating reference upon initialisation as advised by the GObject documentation
- Typed signal generation. Issues shown in rhx/SwiftGtk#35 hat remain to be addressed are listed here: mikolasstuchlik/gir2swift#2.
Other Notable changes
Version 11 introduces a new type system into
to ensure it has a representation of the underlying types.
This is necessary for Swift 5.3 onwards, which requires more stringent casts.
As a consequence, accessors can accept and return idiomatic Swift rather than
underlying types or pointers.
This means that a lot of the changes will be source-breaking for code that
was compiled against libraries built with earlier versions of
- Parameters use idiomatic Swift names (e.g. camel case instead of snake case, splitting out of "for", "from", etc.)
- Requires Swift 5.2 or later (Swift 5.3 is required for the
- Uses the namespace referenced in the
- Wrapper code is now
@inlinableto enable the compiler to optimise away most of the wrappers
- Parameters and return types use more idiomatic Swift (e.g.
Refwrappers instead of pointers,
- Functions that take or return records now are templated instead of using the type-erased Protocol
ErrorTypehas been renamed
GLibErrorto ensure it neither clashes with
- Parameters or return types for records/classes now use the corresponding, lightweight Swift
Refwrapper instead of the underlying pointer
Normally, you don't build this package directly (but for testing you can - see 'Building' below). Instead you need to embed SwiftGtk into your own project using the Swift Package Manager. After installing the prerequisites (see 'Prerequisites' below), add
SwiftGtk as a dependency to your
Package.swift file, e.g.:
// swift-tools-version:5.3 import PackageDescription let package = Package(name: "MyPackage", dependencies: [ .package(name: "gir2swift", url: "https://github.com/rhx/gir2swift.git", .branch("main")), .package(name: "Gtk", url: "https://github.com/rhx/SwiftGtk.git", .branch("gtk3")), ], targets: [.target(name: "MyPackage", dependencies: ["Gtk"])] )
For gtk4 replace
You can find some example projects on GitHub that show how to use SwiftGtk:
The demo applications come with build scripts that configure some environment variables and pass required arguments when calling
swift package, etc. The easiest way to get started is to clone one of the following projects, then copy all the
*.sh shell scripts into your own project. Also, if you want to be able to build a desktop app, create a
Resources folder, and copy (at least) the
Info.plist file as well:
- SwiftHelloGtk: this is a quick starting point for a simple gtk app that does not need any resources.
- SwiftHelloGtkBuilder: this is a good starting point for a more complex app that has user interface files (
*.ui) for GtkBuilder in its
You first need to create the Swift Wrappers using
After that, you can build, test, or run your project using the usual Swift compiler commands:
swift build swift test swift run
On macOS, there is an issue that requires you to pass in the required flags manually (see Building below). You can also build the project using Xcode on macOS instead. To do this, you need to create an Xcode project first, then open the project in the Xcode IDE:
./xcodegen.sh open MyPackage.xcodeproj
After that, use the (usual) Build and Test buttons to build/test this package. Please note that, at this stage, the Swift Package manager is not able to create App targets for Xcode (so to build a macOs app rather than just a command line executable, you still need to use the
build.sh script that calls
app-wrapper.sh to create the standalone app bundle).
To build, you need at least Swift 5.2 (Swift 5.3 is required for
gtk4), download from https://swift.org/download/ -- if you are using macOS, make sure you have the command line tools installed as well). Test that your compiler works using
swift --version, which should give you something like
$ swift --version Apple Swift version 5.4 (swiftlang-1184.108.40.206 clang-1220.127.116.11) Target: x86_64-apple-darwin20.5.0
on macOS, or on Linux you should get something like:
$ swift --version Swift version 5.4 (swift-5.4-RELEASE) Target: x86_64-unknown-linux-gnu
Gtk 3.22 or higher
The Swift wrappers have been tested with glib-2.56, 2.58, 2.60, 2.62, 2.64, 2.66 and 2.68, and gdk/gtk 3.22, 3.24, and 4.0 on the
gtk4 branch. They should work with higher versions, but YMMV. Also make sure you have
gobject-introspection and its
.gir files installed.
On Ubuntu 20.04 and 18.04, you can use the gtk that comes with the distribution. Just install with the
apt package manager:
sudo apt update sudo apt install libgtk-3-dev gir1.2-gtksource-3.0 gobject-introspection libgirepository1.0-dev libxml2-dev jq
On Fedora 29, you can use the gtk that comes with the distribution. Just install with the
dnf package manager:
sudo dnf install gtk3-devel pango-devel cairo-devel cairo-gobject-devel glib2-devel gobject-introspection-devel libxml2-devel jq
On macOS, you can install gtk using HomeBrew (for setup instructions, see http://brew.sh). Once you have a running HomeBrew installation, you can use it to install a native version of gtk:
brew update brew install gtk+3 glib glib-networking gobject-introspection pkg-config jq
As pointed out in the 'Usage' section above, you don't normally build this package directly, but instead you embed it into your own project. However, you can build and test this module separately to ensure that everything works. Make sure you have all the prerequisites installed (see above). After that, you can simply clone this repository and build the command line executable (be patient, this will download all the required dependencies and take a while to compile) using
git clone https://github.com/rhx/SwiftGtk.git cd SwiftGtk ./run-gir2swift.sh swift build swift test
Please note that on macOS, due to a bug in the Swift Package Manager prior to Swift 5.4,
if you have Xcode-12.4 or older, you need to pass in the build flags manually,
i.e. instead of
swift build and
swift test you can run
swift build `./run-gir2swift.sh flags -noUpdate` swift test `./run-gir2swift.sh flags -noUpdate`
On macOS, you can build the project using Xcode instead. To do this, you need to create an Xcode project first, then open the project in the Xcode IDE:
./xcodegen.sh open Gtk.xcodeproj
After that, use the (usual) Build and Test buttons to build/test this package.
You can find reference documentation inside the docs folder.
This was generated using the jazzy tool.
If you want to generate your own documentation, matching your local installation,
you can use the
generate-documentation.sh script in the repository.
Make sure you have sourcekitten and jazzy installed, e.g. on macOS:
brew install sourcekitten sudo gem install jazzy ./run-gir2swift.sh ./generate-documentation.sh
Here are some common errors you might encounter and how to fix them.
SwiftGtk takes a very long time to build
gtk is a huge beast. The Swift interface generated from the
gtk header files is close to 300,000 lines. This takes a long time to build!
Old Swift toolchain or Xcode
If you get an error such as
$ ./build.sh error: unable to invoke subcommand: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-package (No such file or directory)
this probably means that your Swift toolchain is too old. Make sure the latest toolchain is the one that is found when you run the Swift compiler (see above).
If you get an older version, make sure that the right version of the swift compiler is found first in your
PATH. On macOS, use xcode-select to select and install the latest version, e.g.:
sudo xcode-select -s /Applications/Xcode.app xcode-select --install
When building, a lot of warnings appear. This is largely an issue with automatic
RawRepresentableconformance in the Swift Standard library. As a workaround, you can turn this off by passing the
-Xswiftc -suppress-warningsparameter when building.
The current build system does not support directory paths with spaces (e.g. the
My Drivedirectory used by Google Drive File Stream).
BUILD_DIR is not supported in the current build system.
As a workaround, you can use the old build scripts, e.g.
./build.sh (instead of
swift build) to build a package.