How to change the return value (for object) with Aspects's AspectPositionInstead. Refer to: https://www.jianshu.com/p/5ba69f35e034

AspectPositionInstead.m

@interface MyObject : NSObject
@property NSString *name;
@end

@implementation MyObject
-(void)dealloc
{
    NSLog(@"dealloc");
}
@end

@interface AppDelegate ()
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    NSError *error = nil;
    [self aspect_hookSelector:@selector(getMyObject) withOptions:AspectPositionInstead usingBlock:^(id<AspectInfo> info){

        NSInvocation *invocation = info.originalInvocation;

        __unsafe_unretained MyObject *original = nil;
        [invocation invoke];
        [invocation getReturnValue:&original];
        NSAssert([original.name isEqualToString:@"AAAAA"], @"");

        MyObject *new = [[MyObject alloc] init];
        new.name = @"BBBBB";
        objc_setAssociatedObject(invocation, _cmd, new, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
        [invocation setReturnValue:&new];

    } error:&error];

    for (int i = 0; i < 100; i++) {
        MyObject *a = [self getMyObject];
        
        NSAssert([a.name isEqualToString:@"BBBBB"], @"");
    }

    
    return YES;
}

- (MyObject*)getMyObject
{
    MyObject *a = [[MyObject alloc] init];
    a.name = @"AAAAA";
    return a;
}

@end