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Editorial Team
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Asked: 2026-05-14T08:44:19+00:00

We’re integrating a library into an iPhone app which appears to use the google

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We’re integrating a library into an iPhone app which appears to use the google toolbox for iPhone internally.
The google toolbox adds a method gtm_stringBySanitizingAndEscapingForXML to NSString.
The problem is, whenever we attempt to make a call to this library we get

[NSCFString gtm_stringBySanitizingAndEscapingForXML]: unrecognized selector sent to instance 0x272478

So it appears the library is calling that method on a NSCFString, to which the category does not apply.
So… is it the case that the category will not apply across the toll-free bridge to CoreFoundation classes?
If that’s the case then we at least know why it’s blowing up. Figuring out how to fix it is a different matter.

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1 Answer

  1. Editorial Team

    Categories applied to NSString do apply to NSCFString as well, because NSCFString is a subclass of NSMutableString which is a subclass of NSString.

    But have you actually included the Google Toolbox library (GTMNSString+XML.m)?

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