AB Testing Prototype

README

A prototype to show how AOP might be used to changes attributes on the fly as seen in certain A/B-Testing SDKs 

1. create objective-c based project in Xcode
2. add Podfile
3. run 'pod install'
4. open workspace
5. add sourcefiles

ABController.h

//
//  ABController.h
//  ABTestPrototype
//
//  Created by Manuel Meyer on 12.05.15.
//  Copyright (c) 2015 Manuel Meyer. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface ABController : NSObject

@end

ABController.m

//
//  ABController.m
//  ABTestPrototype
//
//  Created by Manuel Meyer on 12.05.15.
//  Copyright (c) 2015 Manuel Meyer. All rights reserved.
//

#import "ABController.h"

#import <Aspects/Aspects.h>
#import <objc/runtime.h>
#import "UIViewController+Updating.h"


@import UIKit;

@implementation ABController


void _ab_register_ab_notificaction(id self, SEL _cmd)
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:NSSelectorFromString(@"ab_notifaction") name:@"ABTestUpdate" object:nil];
}


void _ab_notificaction(id self, SEL _cmd)
{
    NSLog(@"UPDATE %@", self);
}



+(void)load
{
    class_addMethod([UIViewController class], NSSelectorFromString(@"ab_notifaction"), (IMP)_ab_notificaction, "v@:");
    class_addMethod([UIViewController class], NSSelectorFromString(@"ab_register_notifaction"), (IMP)_ab_register_ab_notificaction, "v@:");
    
    
    [UIViewController aspect_hookSelector:@selector(viewDidLoad)
                              withOptions:AspectPositionAfter
                               usingBlock:^(id<AspectInfo> aspectInfo) {
                                   UIViewController *vc = aspectInfo.instance;
                                   SEL selector = NSSelectorFromString(@"ab_register_notifaction");
                                   IMP imp = [vc methodForSelector:selector];
                                   void (*func)(id, SEL) = (void *)imp;
                                   func(vc, selector);
      } error:NULL];
    
    [UIViewController aspect_hookSelector:NSSelectorFromString(@"ab_notifaction")
                              withOptions:AspectPositionAfter
                               usingBlock:^(id<AspectInfo> aspectInfo) {
                                   UIViewController *vc = aspectInfo.instance;
                                   [vc updateViewWithAttributes:@{@"backgroundColor": [UIColor orangeColor]}];
    } error:NULL];
    
    
    [UIViewController aspect_hookSelector:@selector(viewWillAppear:)
                              withOptions:AspectPositionAfter
                               usingBlock:^(id<AspectInfo> aspectInfo) {
                                   
                                   UIViewController *vc = aspectInfo.instance;
                                   [vc updateViewWithAttributes:@{@"backgroundColor": [UIColor blueColor]}];
                                   
                                   
                                   
                                   
                               } error:NULL];
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [[NSNotificationCenter defaultCenter] postNotificationName:@"ABTestUpdate" object:nil];
    });
}
@end

Podfile

platform :ios, '8.0'

pod 'Aspects', '~> 1.4.1'

UIViewController+Updating.h

//
//  UIViewController+Updating.h
//  ABTestPrototype
//
//  Created by Manuel Meyer on 12.05.15.
//  Copyright (c) 2015 Manuel Meyer. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIViewController (Updating)
-(void)updateViewWithAttributes:(NSDictionary *)attributes;
@end

UIViewController+Updating.m

//
//  UIViewController+Updating.m
//  ABTestPrototype
//
//  Created by Manuel Meyer on 12.05.15.
//  Copyright (c) 2015 Manuel Meyer. All rights reserved.
//

#import "UIViewController+Updating.h"

@implementation UIViewController (Updating)
-(void)updateViewWithAttributes:(NSDictionary *)attributes
{
    [[attributes allKeys] enumerateObjectsUsingBlock:^(NSString *obj, NSUInteger idx, BOOL *stop) {
        
        if ([obj isEqualToString:@"backgroundColor"]) {
            [self.view setBackgroundColor:attributes[obj]];
        }
    }];
}
@end