This repository includes code demonstrating an implementation of mixins in Objective-C. While many mixin implementations exist, many lack the ability to use mixins for individual instances.
With FRMixin, you can do the following:
@interface FRTimeAgo : FRModule
@end
@implementation FRTimeAgo
- (NSString *)timeAgo { // more code would go in here
NSTimeInterval seconds = -[self.creationDate timeIntervalSinceNow];
return [NSString stringWithFormat:@"%i hours ago", seconds / 3600];
}
@end
[FRTimeAgo extendClass:[FRArticle class]];
[FRTimeAgo extendInstance:a];
While this specific example may be more easily accomplished as a category on NSDate, mixins still can be an extremely useful tool for composing classes and methods in Objective-C.
This example was created to accompany a presentation. There are no known issues with it, but please thoroughly test anything you use from this example before using it in production.