Я сделал несколько элементарных функций до и после обработки для категории NSObject
@implementation NSObject (AOP)
- (void)preprocess:(SEL)sel with:(void (^)(id obj, id param))implementingBlock{
Method m1 = class_getInstanceMethod(self.class, sel);
IMP imp1 = method_getImplementation(m1);
SEL replacement = sel_registerName( [[[NSString stringWithUTF8String:sel_getName(sel)] stringByAppendingString:@"pre"] cStringUsingEncoding:NSUTF8StringEncoding]);
class_addMethod(self.class,replacement, imp1, nil);
method_setImplementation(m1, imp_implementationWithBlock(^(id x, id param){
implementingBlock(x,param);
[x performSelector:replacement withObject:param];
}));
}
- (void)postprocess:(SEL)sel with:(void (^)(id obj, id param))implementingBlock{
Method m1 = class_getInstanceMethod(self.class, sel);
IMP imp1 = method_getImplementation(m1);
SEL replacement = sel_registerName( [[[NSString stringWithUTF8String:sel_getName(sel)] stringByAppendingString:@"post"] cStringUsingEncoding:NSUTF8StringEncoding]);
class_addMethod(self.class,replacement, imp1, nil);
method_setImplementation(m1, imp_implementationWithBlock(^(id x, id param){
[x performSelector:replacement withObject:param];
implementingBlock(x,param);
}));
}
@end