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Asked: 2026-05-30T00:52:47+00:00

How would I store a CGAffineTransform in NSUserDefaults? Since it contains 6 float values

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How would I store a CGAffineTransform in NSUserDefaults?
Since it contains 6 float values it takes a lot of repetitive work to store each value as float… so I’m wondering if there is a smarter way.

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  1. Editorial Team

    Use NSStringFromCGAffineTransform() and CGAffineTransformFromString().

    Using NSValue, I got:

    -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value ‘CGAffineTransform: {{0.9291659, 0, 0, -0.9291659}, {41.675232, 823.75122}}’ of class ‘NSConcreteValue’. Note that dictionaries and arrays in property lists must also contain only property values.

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