CABackdropLayer is a subclass of CALayer that clones the content behind it as its own contents. It's useful for applying effects that only apply to some part of the screen, which might be made up of any number of layers behind it.
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CABackdropLayer is a subclass of CALayer that clones the content behind it as its own contents. It's useful for applying effects that only apply to some part of the screen, which might be made up of any number of layers behind it.
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