I'm building a static library for use in an iOS project, and I want to decode XML entities returned from a web service. I've grabbed Google Toolbox for Mac and added the following files to my project:
Then in my own .m file I'm doing this:
#import "GTMNSString+HTML.h"
// then in one of my methods:
NSString *value = [anotherNSStringValue gtm_stringByUnescapingFromHTML];
The code compiles fine, but when I run the app that uses my static library it crashes with a NSInvalidArgumentException, complaining that the gtm_stringByUnescapingFromHTML selector isn't recognised for NSString:
2011-02-10 12:21:38.401 MyApp[20356:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString gtm_stringByUnescapingFromHTML]: unrecognized selector sent to instance 0x71403e0'
*** Call stack at first throw:
(
0 CoreFoundation 0x0111bbe9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x012705c2 objc_exception_throw + 47
2 CoreFoundation 0x0111d6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x0108d366 ___forwarding___ + 966
4 CoreFoundation 0x0108cf22 _CF_forwarding_prep_0 + 50
5 MyApp 0x00028dcf -[GSMyAppXMLParser parseData:] + 714
// Rest of stack trace removed
)
terminate called after throwing an instance of 'NSException'
I've found a few similar issues on Stack Overflow, and in each case the questioner has subsequently commented that they fixed it by tweaking a linker setting - but without disclosing which setting! If anyone can help me with this I'd be forever grateful!
I’m guessing that would be the -ObjC and -all_load flags.
You add these to the ‘Other Linker Flags’ of the app that links agains the library, not the library itself.
For more info see: http://developer.apple.com/library/mac/#qa/qa2006/qa1490.html