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My project has a UIImage category function that I want to call from another class. I properly import the header file for the image category and I get the project to compile with no warning. The problem is that when I call the UIImage category function I seen an unrecognized selector error with a NSInvalidArgumentException . Why am I seeing this if I've properly linked everything? #import <UIKit/UIKit.h> @interface UIImage (DRShare) + (UIImage*) imageNamed:(NSString*)name; @end @implementation UIImage (DRShare) + (UIImage*) imageNamedDR:(NSString*)name{ CGFloat s = 1.0f; if([[UIScreen mainScreen] respondsToSelector:@selector(scale)]){ s = [[UIScreen mainScreen] scale]; } NSString *path = [NSString stringWithFormat:@"%@%@%@.png",kImagesPath,name,s > 1 ? @"@2x":@""]; return [UIImage imageWithContentsOfFile:DRBUNDLE(path)]; } @end file that calls it: backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamedDR:@"Share Popup Background"]]; exception raised: 2010-10-22 11:51:02.880 Stuff[11432:207] +[UIImage imageNamedDR:]: unrecognized selector sent to class 0x1f8e938 2010-10-22 11:51:02.883 Stuff[11432:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[UIImage imageNamedDR:]: unrecognized selector sent to class 0x1f8e938' *** Call stack at first throw: ( 0 CoreFoundation 0x02e65b99 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x02fb540e objc_exception_throw + 47 2 CoreFoundation 0x02e6776b +[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x02dd72b6 ___forwarding___ + 966 4 CoreFoundation 0x02dd6e72 _CF_forwarding_prep_0 + 50 5 TapTapShare 0x0001291c

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