popup can't close (IBAction not working) - objective-c

Question

I use a popup system that I found here : https://blog.typpz.com/2013/12/09/ios-sdk-create-a-pop-up-window/
And after following the guide step by step everything works except the closing button. I tried to link it in various ways but nothing works.
Does anyone know what I do wrong ?
here is my code:
PopUpController.h:
#import <UIKit/UIKit.h>
//#import <QuartzCore/QuartzCore.h>
#import "AppDelegate.h"
#interface PopUpViewController : UIViewController
#property (weak, nonatomic) IBOutlet UIView *popUpView;
- (void)showInView:(UIView *)aView animated:(BOOL)animated;
- (IBAction)closePopup:(id)sender;
#end
PopUpController.m:
#import "PopUpViewController.h"
#interface PopUpViewController ()
#end
#implementation PopUpViewController
- (void)viewDidLoad {
self.view.backgroundColor=[[UIColor blackColor] colorWithAlphaComponent:.6];
self.popUpView.layer.cornerRadius = 5;
self.popUpView.layer.shadowOpacity = 0.8;
self.popUpView.layer.shadowOffset = CGSizeMake(0.0f, 0.0f);
self.popUpView.clipsToBounds = YES;
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
// Do any additional setup after loading the view from its nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma animation
- (void)showAnimate
{
self.view.transform = CGAffineTransformMakeScale(1.3, 1.3);
self.view.alpha = 0;
[UIView animateWithDuration:.25 animations:^{
self.view.alpha = 1;
self.view.transform = CGAffineTransformMakeScale(1, 1);
}];
}
- (void)removeAnimate
{
[UIView animateWithDuration:.25 animations:^{
self.view.transform = CGAffineTransformMakeScale(1.3, 1.3);
self.view.alpha = 0.0;
} completion:^(BOOL finished) {
if (finished) {
[self.view removeFromSuperview];
}
}];
}
- (void)showInView:(UIView *)aView animated:(BOOL)animated
{
[aView addSubview:self.view];
if (animated) {
[self showAnimate];
}
}
- (IBAction)closePopup:(id)sender {
NSLog(#"closing...");
[self removeAnimate];
}
#end
NOTE: I don't even get the NSLog closing... on my console when I click the closing button
here is a screenshot of my .xib file:
Thank you for your response.