🤖Compiler Directives

Using compiler directives in Swift - Sundell
Feature flags in Swift - Sundell
Compiler Directives - Elements Docs
Understanding @inlinable in Swift - SwiftRocks

Compilation Condition: #if

#if DEBUG
#if <compilation flag> 👉 Feature flags in Swift
#if targetEnvironment( )

func log(_ expression: @autoclosure () -> Any) {
    // print a given expression only within debug builds
    #if DEBUG
    print(expression())
    #endif
}

struct EditorView: View {
    //...
    var body: some View {
    
        #if os(tvOS)
        CanvasView()
        #else
        CanvasView().gesture(DragGesture().onChanged { state in
          // ...
        })
        #endif
        // ...
    }
}

func setupTabBarController(_ controller: UITabBarController) {
    var viewControllers = [UIViewController]()

    #if targetEnvironment(simulator)
    viewControllers.append(DebugViewController())
    #endif

    controller.viewControllers = viewControllers
}

PreviousInstruments Next@available, #available

Last updated 3 years ago

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