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Creating Fully Transparent Blurry Windows in SwiftUI/macOS

This guide demonstrates how to create beautiful, fully transparent blurry windows in a SwiftUI macOS application, based on the FloatingNotes app implementation.

Overview

The FloatingNotes app creates floating, semi-transparent windows with a blur effect that integrates beautifully with the macOS desktop. Here's how it's implemented:

Key Components

1. Window Configuration

The core window configuration is done in the WindowManager class. Here's how to set up a transparent, blurry window:

// WindowManager.swift - Creating a new transparent window
func addNewNoteWindow() {
    let newWindow = NSWindow(
        contentRect: NSRect(x: 0, y: 0, width: 480, height: 300),
        styleMask: [.titled, .closable, .miniaturizable, .resizable],
        backing: .buffered,
        defer: false
    )
    
    // Configure frame with random offset for multiple windows
    if let screen = NSScreen.main {
        let screenRect = screen.visibleFrame
        let xOffset = CGFloat.random(in: -40...40)
        let yOffset = CGFloat.random(in: -40...40)
        let newOriginX = (screenRect.width - newWindow.frame.width) / 2 + xOffset
        let newOriginY = (screenRect.height - newWindow.frame.height) / 2 + yOffset
        newWindow.setFrameOrigin(NSPoint(x: newOriginX, y: newOriginY))
    }

    // Apply all styling for transparency and blur
    newWindow.titlebarAppearsTransparent = true
    newWindow.styleMask.insert(.fullSizeContentView)
    newWindow.isOpaque = false
    newWindow.backgroundColor = .clear
    newWindow.level = .floating // Make the window float above others
    newWindow.collectionBehavior = .canJoinAllSpaces // Show on all spaces
    
    // Create and set the content view
    let noteView = NoteView(window: newWindow)
    newWindow.contentView = NSHostingView(rootView: noteView)
    newWindow.delegate = self
    
    openWindows.append(newWindow)
    newWindow.makeKeyAndOrderFront(nil)
}

2. Visual Effect View

The blur effect is achieved using NSVisualEffectView wrapped in a SwiftUI NSViewRepresentable:

// ContentView.swift - NSViewRepresentable wrapper for NSVisualEffectView
struct VisualEffectView: NSViewRepresentable {
    func makeNSView(context: Context) -> NSVisualEffectView {
        let visualEffect = NSVisualEffectView()
        visualEffect.blendingMode = .behindWindow
        visualEffect.state = .active
        visualEffect.material = .dark
        return visualEffect
    }
    
    func updateNSView(_ nsView: NSVisualEffectView, context: Context) {
        // No updates needed
    }
}

3. Content View Implementation

The NoteView combines the visual effect with transparent content:

// ContentView.swift - NoteView body
var body: some View {
    ZStack {
        // Background visual effect
        VisualEffectView()
            .ignoresSafeArea()
        
        // Use TextEditor for a multi-line editable text area
        TextEditor(text: $noteText)
            .scrollContentBackground(.hidden) // Hide the default background
            .background(.clear) // Make TextEditor background transparent
            .font(.system(size: 14))
            .foregroundColor(.primary) // Ensure text is visible
            .scrollIndicators(.never)
            .padding(.leading, 10)
    }
    .focusable()
    .focused($isFocused)
    // ... additional modifiers
}

Key Properties Explained

Window Transparency Properties

  1. titlebarAppearsTransparent: Makes the title bar transparent
  2. styleMask.insert(.fullSizeContentView): Extends content under the title bar
  3. isOpaque = false: Makes the window non-opaque
  4. backgroundColor = .clear: Sets window background to clear

Window Behavior Properties

  1. level = .floating: Makes window float above other windows
  2. collectionBehavior = .canJoinAllSpaces: Shows window on all desktop spaces

Visual Effect Properties

  1. blendingMode = .behindWindow: Blends with content behind the window
  2. state = .active: Keeps the effect always active
  3. material = .dark: Uses dark material for the blur effect

Settings Window Implementation

The app also applies the same styling to its settings window:

// FloatingNotesApp.swift - Settings window styling
Settings {
    SettingsView()
        .onAppear {
            for window in NSApplication.shared.windows {
                if let contentView = window.contentView,
                   contentView.subviews.contains(where: { ($0 as? NSHostingView<SettingsView>) != nil }) || window.title == "Floating Notes Settings" {
                    window.titlebarAppearsTransparent = true
                    window.styleMask.insert(.fullSizeContentView)
                    window.isOpaque = false
                    window.backgroundColor = .clear
                    window.level = .floating
                    window.collectionBehavior = .canJoinAllSpaces
                    break
                }
            }
        }
}

Content Transparency

To ensure the content within the window is also transparent:

  1. TextEditor: Use .scrollContentBackground(.hidden) and .background(.clear)
  2. Other Views: Apply .background(.clear) to maintain transparency
  3. ZStack: Use VisualEffectView as the bottom layer

App Entitlements

For proper sandboxing while maintaining functionality:

<!-- FloatingNotes.entitlements -->
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>com.apple.security.app-sandbox</key>
    <true/>
    <key>com.apple.security.files.user-selected.read-write</key>
    <true/>
</dict>
</plist>

Window Management

The WindowManager singleton handles multiple windows:

class WindowManager: NSObject, NSWindowDelegate {
    static let shared = WindowManager()
    private var openWindows: [NSWindow] = []
    
    // NSWindowDelegate method to handle window closing
    func windowWillClose(_ notification: Notification) {
        if let window = notification.object as? NSWindow {
            openWindows.removeAll { $0 == window }
            print("WindowManager: Window closed. Total managed windows: \(openWindows.count)")
        }
    }
}

Material Options

You can customize the blur effect by changing the material:

  • .dark - Dark blur effect
  • .light - Light blur effect
  • .ultraThin - Very subtle blur
  • .thin - Light blur
  • .regular - Standard blur
  • .thick - Heavy blur
  • .hudWindow - HUD-style blur

Best Practices

  1. Memory Management: Always maintain proper references to windows
  2. Window Delegation: Implement NSWindowDelegate for cleanup
  3. Focus Management: Use @FocusState for proper keyboard handling
  4. Background Transparency: Ensure all content views use clear backgrounds
  5. Testing: Test on different desktop backgrounds to ensure readability

Troubleshooting

Common Issues:

  1. Window not transparent: Ensure isOpaque = false and backgroundColor = .clear
  2. Content not blurred: Check that VisualEffectView is in the background layer
  3. Text not visible: Adjust foregroundColor or try different blur materials
  4. Window not floating: Verify level = .floating is set

This implementation creates beautiful, functional transparent blurry windows that integrate seamlessly with the macOS desktop environment.