🧊 The Temporary “Glass Bypass”: Apple’s Secret Switch for Developers Caught Mid-Upgrade

So you’ve just updated to the latest iOS SDK, and suddenly your app looks like it got dropped inside an Apple Store.
Blurs, translucency, reflections, every corner now has that “Liquid Glass” vibe straight from Cupertino’s design lab.

Beautiful? Yes.
Stable for your old layout? …Not so much.

If your app suddenly looks more “melting sorcery” than “sleek minimalism”, don’t panic. Apple knows big design transitions take time, and they’ve given developers a temporary escape hatch:
UIDesignRequiresCompatibility: a hidden key you can add to your app’s Info.plist to tell the system, “Hey, chill. Keep my old design for now.”

Let’s break down what it does, how to use it, and when to stop relying on it.

What Apple Actually Says

Straight from Apple’s official documentation:

A Boolean value that indicates whether the system runs the app using a compatibility mode for UI.
— Apple Developer Documentation

That’s it. Simple and clean.
If set to true, the system uses an older, compatibility-friendly UI rendering mode instead of automatically applying the new global design updates introduced in the latest SDKs.

In short:
✅ true: old look (your current layout remains safe)
🚫 false: new look (your app joins the glass revolution)

Why This Exists

Whenever Apple introduces a major visual update, system components (like navigation bars, tab bars, sheets, and buttons) start behaving differently.
Margins shift. Blurs layer differently. Background materials change.

Apple added UIDesignRequiresCompatibility to help developers transition smoothly without their production apps turning into visual chaos overnight.

Think of it as a grace period for your app’s armor change.
You can keep wearing last battle’s outfit while forging your new one.

But there’s a catch (and it’s written between Apple’s lines):
⚠️ This flag is temporary. It’s meant to help you adapt, not to live in nostalgia forever. Expect it to disappear in a future SDK once Apple feels the world has caught up.

How to Use It

To use UIDesignRequiresCompatibility, add the following key to your Info.plist file:

<key>UIDesignRequiresCompatibility</key>
<true/>

<key>UIDesignRequiresCompatibility</key>
<true/>

That’s it. No extra frameworks, no runtime code, no build setting complications.
Once added, your app will render using the compatibility UI mode.

If you prefer to edit using Xcode’s property list editor, just:

1. Open Info.plist.
2. Click the + button.
3. Add a new key: UIDesignRequiresCompatibility.
4. Set the Type to Boolean.
5. Set the Value to YES.

💡 Pro tip: You can flip it off at any time to preview the new “Liquid Glass” UI and compare how your layouts behave under the new rendering system.

When to Remove It

Here’s the golden rule:
Use UIDesignRequiresCompatibility only while you’re updating your layouts, navigation bars, or custom components that look off in the new system.

Once your UI is ready for the “glass era”, remove the key completely.
That way, your app automatically adopts the latest design and feels native on future devices.

If you leave the flag on too long, you’ll risk your app looking dated once Apple removes the fallback in a later SDK, plus Apple won’t accept app updates with this flag once they’ve decided to remove it.