How do i call a parent ViewController's method?

Peekaboo.h

#import <UIKit/UIKit.h>
#import "ViewController.h"

@interface Peekaboo : UIView

@property (nonatomic, retain) ViewController *parentView;

- (void) show;

@end

Peekaboo.m

#import "Menu.h"

@implementation Menu

@synthesize parentView;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {

        //do the bullshit here
        
    }
    return self;
}


- (void) show {
    
    //this tells me that the parent view doesnt have a selector called showMyLabel
    [parentView showMyLabel];
 
}

ViewController.h

#import <UIKit/UIKit.h>

#import "Peekaboo.h"

@interface ViewController : UIViewController

- (void) showMyLabel;

//views
@property (nonatomic, retain) Peekaboo *peekabooView;

@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()
@end

@implementation ViewController

@synthesize peekabooView;


//view controller initiation
- (void)viewDidLoad {
    
    //peekaboo view
    peekabooView = [[Menu alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
    peekabooView.parentView = self;
    [self.view insertSubview:peekabooView atIndex:1];

    //create the label and hide it and stuff

}

- (void) showMyLabel {
   //show the stupid label created above
}