This is an experimental project that enables hot reloading of Swift code in SwiftPM based projects.

1. Add SwiftReload to your project's dependencies in Package.swift:

dependencies: [
 .package(url: "https://github.com/ShaftUI/SwiftReload.git", branch: "main")
]

2. Add SwiftReload to your target's dependencies:

.executableTarget(
 name: "MyApp",
 dependencies: [
 "SwiftReload"
 ]
)

1. Add -enable-private-imports and -enable-implicit-dynamic flag to your target's build settings:

.executableTarget(
 name: "MyApp",
 dependencies: [
 "SwiftReload"
 ],
 swiftSettings: [
 .unsafeFlags(
 ["-Xfrontend", "-enable-private-imports"],
 .when(configuration: .debug)
 ),
 .unsafeFlags(
 ["-Xfrontend", "-enable-implicit-dynamic"],
 .when(configuration: .debug)
 ),
 ],
 linkerSettings: [
 .unsafeFlags(
 ["-Xlinker", "--export-dynamic"],
 .when(platforms: [.linux, .android], configuration: .debug)
 ),
 ]
)

This enables method swizzling, which SwiftReload uses to replace code at runtime.

On Linux, you also need to add the -Xlinker --export-dynamic flag to the linker settings to export all symbols from the executable.

3. Add the following code at the beginning of your main.swift:

import SwiftReload
LocalSwiftReloader().start()

For complete example, see the Sources/SwiftReloadExample directory.

The LocalSwiftReloader has a onReload callback that is called when the code reload is triggered. You can call backend.scheduleReassemble in the callback to rebuild the UI.

#if DEBUG
 import SwiftReload
 LocalSwiftReloader(onReload: backend.scheduleReassemble).start()
#endif

SwiftReload monitors changes to the source files of your project. When a change is detected, it recompiles the updated source files to a dynamic library and loads it into the running process. The dynamic library then replaces the existing code in the process, effectively enabling hot reloading of Swift code.