UISheetPresentationController overrides its superclass' backgroundEffect property and applies the provided effect to the background of a sheet. You can use any UIVisualEffect here, including the UIBlurEffects of yore. Setting the property to nil gives you the default glass effect.

...which is the new backgroundEffect property. This doesn't do anything in isolation but is a nice common API for your subclass to hook into. The really nice addition is how UISheetPresentationController handles this.

iOS 26 SDKからです UIKitを経由するなら今でも透明に出来ます .sheet内部のUIViewControllerRepresentable からUISheetPresentationController を探し出しbackgroundEffectに clearなUIColorEffectを入れてください

New in the iOS 26.1 SDK is a property of UIPresentationController (that UISheetPresentationController inherits) called backgroundEffect. You can set this to any instance of some UIVisualEffect subclass BUT if you initialise an empty UIBlurEffect, you can get truly clear sheets back! It's _incredibly_ hard to see in the screenshot below, but that's kind of the point...

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Did you get this working with -[UIBarAppearance backgroundEffect]?

Yeah you definitely could. UINavigationBarAppearance even has a backgroundEffect property that you could set to -[UIBlurEffect effectWithVariableBlurRadius:imageMask:]

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