Swift Font Viewer tools allow developers and designers to instantly preview typefaces directly within their Apple development environment. Rather than manually installing, compiling, and testing typography options in code, these utilities leverage Xcode Previews or dedicated iOS applications. This gives you an immediate look at how a font behaves across multiple device scales. Why Core Font Previews Matter
When designing iOS and macOS applications, typography heavily impacts user experience. Building a custom font preview utility using SwiftUI offers significant advantages:
Immediate Feedback: Avoid the repetitive cycle of compiling code just to see a styling shift.
Hierarchy Verification: Instantly check how a typeface looks as a largeTitle, body, or footnote side-by-side.
Dynamic Type Testing: Validate how your typeface scales automatically with system accessibility settings.
Weight Auditing: Preview all available PostScript font weights, from ultra-light to heavy, in a clean layout. Standard Built-In Preview Code
If you are building your own swift-based viewer or using a shared utility from GitHub repositories, it typically loops through UIFont.familyNames. You can implement a responsive scrollable preview canvas inside Xcode using this basic structure:
import SwiftUI struct FontViewer: View { let sampleText = “Swift Typography 123” // Grabs all system and registered application fonts let fontFamilies = UIFont.familyNames.sorted() var body: some View { NavigationStack { List(fontFamilies, id: .self) { family in Section(header: Text(family)) { ForEach(UIFont.fontNames(forFamilyName: family), id: .self) { fontName in VStack(alignment: .leading) { Text(fontName) .font(.caption) .foregroundColor(.secondary) Text(sampleText) .font(.custom(fontName, size: 18)) } } } } .navigationTitle(“Swift Font Viewer”) } } } #Preview { FontViewer() } Use code with caution. Common Gotchas with Previews
When displaying custom third-party font files inside Xcode Previews or Swift Packages, developers often run into a roadblock where the font falls back to the system default. You can fix this with a few configuration steps: How to use custom fonts in Previews when in a Swift Package
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