How to Use iOS 26+ Liquid Glass APIs in SwiftUI: A Complete Developer Guide

Apply the glassEffect() modifier and GlassEffectContainer to render Apple’s native Liquid Glass material on iOS 26+, ensuring hardware-accelerated blur and dynamic lighting without custom layers.

The openai/plugins repository houses the definitive SwiftUI Liquid Glass skill that encodes design guidance for adopting translucent materials in modern applications. According to the source definition at plugins/build-ios-apps/skills/swiftui-liquid-glass/SKILL.md, iOS 26 introduces native APIs including glassEffect(), GlassEffectContainer, and GlassButtonStyle that replace inefficient custom blur implementations with system-optimized rendering pipelines.

Core Principles from the Source Code

The SKILL.md file in the openai/plugins repository establishes four fundamental rules for implementing Liquid Glass in SwiftUI applications:

• Prefer native APIs: Use glassEffect(), GlassEffectContainer, and built-in glass button styles rather than custom blur layers or third-party effects.
• Leverage system containers: Place toolbars, search fields, and sheets on floating Liquid Glass surfaces so the system manages material elevation and dynamic lighting automatically.
• Group for performance: Wrap multiple sibling views that share identical glass effects inside GlassEffectContainer to enable efficient compositing and smooth morphing transitions.
• Customize conservatively: The Glass struct allows tint, radius, and opacity adjustments, but defaults should only be overridden when specific design requirements demand it.

Step-by-Step Implementation

Identify Target UI Surfaces

Before applying effects, locate view hierarchies where translucent materials improve depth perception—such as bottom tab bars, side panels, or modal sheets. According to the reference documentation at plugins/build-ios-apps/skills/swiftui-liquid-glass/references/liquid-glass.md, Liquid Glass is designed specifically for surfaces that sit above content and reveal the backdrop beneath them.

Apply the glassEffect() Modifier

The primary entry point for Liquid Glass is the glassEffect() view modifier. Apply it directly to any SwiftUI view to inject the system-provided blur, tint, and dynamic lighting.

import SwiftUI

struct GlassyCard: View {
    var body: some View {
        VStack {
            Text("Hello, Liquid Glass!")
                .font(.headline)
                .foregroundColor(.primary)
        }
        .padding()
        .background(.ultraThinMaterial)  // Fallback for older iOS versions
        .glassEffect()                    // Native iOS 26+ API
        .cornerRadius(12)
        .shadow(radius: 4)
    }
}

The view automatically updates its blur intensity and color tint as the background content changes, reacting to ambient light conditions without manual intervention.

Group Views with GlassEffectContainer

When multiple sibling views require identical glass materials, wrapping them in GlassEffectContainer batches rendering operations and reduces GPU overhead. This container enables the smooth morphing behavior characteristic of the iOS 26 design language.

struct Dashboard: View {
    var body: some View {
        GlassEffectContainer {
            HStack(spacing: 24) {
                Image(systemName: "heart.fill")
                Image(systemName: "star.fill")
                Image(systemName: "bolt.fill")
            }
            .font(.largeTitle)
            .foregroundStyle(.white)
        }
        .padding()
        .background(.ultraThinMaterial)  // Fallback material
    }
}

Customize Appearance with the Glass Struct

For scenarios requiring specific visual treatment, instantiate the Glass struct with custom tint, radius, and opacity values, then pass it to the glassEffect(_:) initializer.

struct CustomGlassView: View {
    let customGlass = Glass(
        tint: .blue.opacity(0.2),   // Subtle blue tint
        radius: 20,                 // Stronger blur radius
        opacity: 0.85
    )
    
    var body: some View {
        VStack {
            Text("Custom Glass")
                .font(.title2)
                .padding()
        }
        .glassEffect(customGlass)   // Apply custom configuration
        .cornerRadius(16)
    }
}

This approach maintains compatibility with the native rendering pipeline while providing controlled customization.

Use Built-In Glass Button Styles

Replace custom button backgrounds with the system-provided GlassButtonStyle to ensure visual consistency with Apple's design language. Apply the style using the .glass modifier.

struct GlassButton: View {
    var body: some View {
        Button("Press Me") {
            // Action logic
        }
        .buttonStyle(.glass)          // Applies GlassButtonStyle
        .padding()
    }
}

The .glass style automatically adapts to the current Liquid Glass material context, eliminating the need for manual background layer management.

Testing and Validation

Run applications on physical iOS 26+ devices or simulators to verify dynamic behaviors including light adaptivity and touch feedback. The Liquid Glass system reacts to ambient lighting conditions and user interactions in ways that static design previews cannot accurately represent, making runtime testing essential for confirming correct behavior.

Summary

• Use glassEffect() as the primary modifier for applying Liquid Glass materials to individual views in iOS 26+.
• Wrap related views in GlassEffectContainer to optimize rendering performance and enable morphing animations.
• Implement GlassButtonStyle via .buttonStyle(.glass) instead of custom background views for interactive controls.
• Reference plugins/build-ios-apps/skills/swiftui-liquid-glass/references/liquid-glass.md for authoritative code patterns and API details.
• Maintain fallback materials such as .ultraThinMaterial to support older iOS versions gracefully.

Frequently Asked Questions

What is the minimum iOS version required for Liquid Glass APIs?

Liquid Glass APIs including glassEffect() and GlassEffectContainer require iOS 26 or later. For applications supporting earlier versions, provide fallback materials like .ultraThinMaterial or .regularMaterial to maintain visual continuity across older devices.

How does GlassEffectContainer improve rendering performance?

GlassEffectContainer batches multiple views sharing identical glass materials into a single composited surface. According to the openai/plugins source code, this container reduces GPU draw calls and enables hardware-accelerated blur and morphing effects more efficiently than applying individual modifiers to separate views.

Can I use custom blur effects instead of the native Liquid Glass APIs?

While technically possible, the openai/plugins repository explicitly recommends against custom blur implementations. Native APIs in iOS 26+ are optimized for battery efficiency, dynamic lighting adaptation, and accessibility features that custom UIVisualEffectView wrappers cannot replicate reliably.

Where are the definitive reference files located within the repository?

The complete API reference resides at plugins/build-ios-apps/skills/swiftui-liquid-glass/references/liquid-glass.md, while high-level design guidance and usage policies are defined in plugins/build-ios-apps/skills/swiftui-liquid-glass/SKILL.md. The default prompt configuration for automated tools is stored in plugins/build-ios-apps/skills/swiftui-liquid-glass/agents/openai.yaml.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}