Question

I included a header in my prefix.pch file as so:

#import <Availability.h>

#ifndef __IPHONE_3_0
#warning "This project uses features only available in iPhone SDK 3.0 and later."
#endif 

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
    #import "Constants.h"
#endif

And in the included header is a class extensions:

@interface UIColor (MyApp)

+(UIColor *) myColor;
+(UIColor *) navColor;

@end

@implementation UIColor (MyApp)

+(UIColor *) myColor { return [UIColor colorWithRed:0 green:0.3 blue:0.7 alpha:1.0]; }
+(UIColor *) navColor { return [UIColor colorWithRed:0.3 green:0.1 blue:0.2 alpha:1.0]; }

@end

Which I then called in other files as such:

[self.theTable setSeparatorColor:[UIColor myColor]];

But since upgrading to xCode 4.2 / iOS 5 it now causes a crash, saying "Thread 1: Program received signal: "SIGABRT". at the above line.

This happens whenever I try and reference the color regardless of which file and what context. I did not have this problem when working on iOS 4.

Is there a better was to extend a class in a way that is available to all files, or to fix the above error?

Many thanks,

Tim

Answer 1

Your declarations should be in a header:

@interface UIColor (MyApp)

+(UIColor *) myColor;
+(UIColor *) navColor;

@end

and your definitions should be in your .m:

@implementation UIColor (MyApp)

+(UIColor *) myColor { return [UIColor colorWithRed:0 green:0.3 blue:0.7 alpha:1.0]; }
+(UIColor *) navColor { return [UIColor colorWithRed:0.3 green:0.1 blue:0.2 alpha:1.0]; }

@end

that may not necessarily be the reason for your SIGABRT, but your @implementation block should only ever be visible to one translation (surprised it did not give a link error, unless i misunderstood your question).

Is there any more context to why the program crashed?