A userData category on SPEvent

SPEvent+UserData.h

//
//  SPEvent+UserData.h
//
//  Created by Brian Ensor on 9/24/12.
//

#import "SPEvent.h"

@interface SPEvent (UserData)

@property (nonatomic, retain) id userData;

@end

SPEvent+UserData.m

//
//  SPEvent+UserData.m
//
//  Created by Brian Ensor on 9/24/12.
//

#import "SPEvent+UserData.h"
#import <objc/runtime.h>

static char userDataKey;

@implementation SPEvent (UserData)

- (id)userData {
    return objc_getAssociatedObject(self, &userDataKey);
}

- (void)setUserData:(id)userData {
    objc_setAssociatedObject(self, &userDataKey, userData, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

@end