swizzle tests

gistfile1.m

//
//  main.m
//  swizzle
//
//  Created by Alex Manzella on 04/07/14.
//  Copyright (c) 2014 mpow. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

@interface MPResponder : NSObject

@end

@implementation MPResponder

- (NSInteger)plusplus:(NSInteger)number{
    
    NSLog(@"orig %@",NSStringFromSelector(_cmd));
    
    return number+1;
    
}

@end

@interface MPView : MPResponder

@end

@implementation MPView

@end

@interface MPView (swizzling)

@end


@implementation MPView (swizzling)

static IMP defaultIMP;

+ (void)load{
    
    NSLog(@"swizzling");
    
    defaultIMP = class_getMethodImplementation(self, @selector(plusplus:));
    IMP newIMP = class_getMethodImplementation(self, @selector(hooked_plusplus:));
    
    method_setImplementation(class_getInstanceMethod(self, @selector(plusplus:)), newIMP);
    
}

- (NSInteger)hooked_plusplus:(NSInteger)number{
    
    NSLog(@"swizzling %@",NSStringFromSelector(_cmd));

    number = (NSInteger)defaultIMP(self,_cmd,number);
    
    return number+2;
}

@end



@interface MPView (swizzlingagain)

@end


@implementation MPView (swizzlingagain)

static IMP hookedOnlyOnceIMP;

+ (void)load{
    
    NSLog(@"swizzling again");
    
    hookedOnlyOnceIMP = class_getMethodImplementation(self, @selector(plusplus:));
    IMP newIMP = class_getMethodImplementation(self, @selector(againhooked_plusplus:));
    
    method_setImplementation(class_getInstanceMethod(self, @selector(plusplus:)), newIMP);
    
}

- (NSInteger)againhooked_plusplus:(NSInteger)number{
    
    NSLog(@"swizzlingagain %@",NSStringFromSelector(_cmd));
    number = (NSInteger)hookedOnlyOnceIMP(self,_cmd,number);
    
    return number+2;
}

@end

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        // insert code here...
        MPView* view=[[MPView alloc] init];
        
        NSLog(@"number %li",(long)[view plusplus:10]);
        
        
    }
    return 0;
}