如何在SwiftUI预览中启用Display Zoom模式？

Great question! Let me break down how to configure Display Zoom across different iOS environments, and address the SwiftUI Preview limitation you're asking about:

On Physical iOS Devices #

• Open the Settings app
• Head to Display & Brightness
• Tap Display Zoom
• Pick either Standard or Zoomed mode, then confirm your choice to apply the setting

On iOS Simulators #

• Launch the Settings app inside the simulator
• Navigate to Developer Options
• Look for and select Display Zoom
• Choose your preferred mode (Standard or Zoomed) to adjust the simulator's display

SwiftUI Previews: No Official Method (Yet) #

Right now, there’s no built-in, official way to set Display Zoom directly within SwiftUI Previews. This is a common frustration for developers who want to test their UI layouts under both zoom levels without switching to a simulator or physical device.

A few informal workarounds folks have experimented with:

• Manually adjusting the preview's simulated device size to approximate zoomed dimensions (though this isn't an exact match to how the system handles Display Zoom)
• Adding custom code to scale UI elements temporarily using environment variables during preview testing, but this doesn't replicate the system-level zoom behavior perfectly

For now, the most reliable way to test how your UI behaves with Display Zoom is still using a physical device or simulator as outlined earlier.

内容的提问来源于stack exchange，提问作者David