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AÑADIR PERMISOS A PLIST:
NSPhotoLibraryUsageDescription = "Access to the photo library";
NSCameraUsageDescription = "Access to the camera";


AÑADIR DELEGATE UIImagePickerControllerDelegate y UINavigationControllerDelegate

let picker = UIImagePickerController()

override func viewDidLoad() {
       super.viewDidLoad()
       picker.delegate = self
   }
   
   
PARA PHOTO LIBRARY:
@IBAction func photoFromLibrary(_ sender: UIBarButtonItem) {
   picker.allowsEditing = false
   picker.sourceType = .photoLibrary
   picker.mediaTypes = UIImagePickerController.availableMediaTypes(for: .photoLibrary)!
   present(picker, animated: true, completion: nil)
}

PARA CAMARA:
@IBAction func shootPhoto(_ sender: UIBarButtonItem) {
    if UIImagePickerController.isSourceTypeAvailable(.camera) {
        picker.allowsEditing = false
        picker.sourceType = UIImagePickerControllerSourceType.camera
        picker.cameraCaptureMode = .photo
        picker.modalPresentationStyle = .fullScreen
        present(picker,animated: true,completion: nil)
    } 
}
   
   
//UIImagePickerControllerDelegate
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage //2
        imgWord.image = chosenImage;
        dismiss(animated:true, completion: nil) //5
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
             dismiss(animated: true, completion: nil)    
}

1) Añadir delegates a .h
@interface LOAddDeviceViewController : TextViewController <UIActionSheetDelegate, UIImagePickerControllerDelegate>

2) Rutina que se asigna al tap de la imagen (mejor que boton) y que muestra el actionSheet

#pragma-mark Photo Selection

-(void) photoSelection{
    [self.view endEditing:YES];
    UIActionSheet *popup = [[UIActionSheet alloc] initWithTitle:NSLocalizedString(@"chat_attach_msg",nil) delegate:self cancelButtonTitle:NSLocalizedString(@"lbl_cancel",nil) destructiveButtonTitle:nil otherButtonTitles:
                            NSLocalizedString(@"chat_attach_camera",nil),
                            NSLocalizedString(@"chat_attach_gallery",nil),
                            nil];
    popup.tag = 1;
    [popup showInView:self.view];

}

3) Delegate del ActionSheet

#pragma mark - Action Sheet Delegate

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    
    if (buttonIndex == 0) { //select_gallery
        [self showImagePicker:NO];
    }
    if (buttonIndex == 1) { //select_camera
        [self showImagePicker:YES];
    }
}

4) Delegate del imagePicker

#pragma mark - UIImagePickerController delegate

- (void)showImagePicker:(BOOL)fromAlbum {
    
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.allowsEditing=NO;
    imagePicker.delegate = self;
    
    if (fromAlbum) {
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
            [self presentViewController:imagePicker animated:YES completion:nil];
        }];
    } else {
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
            [self presentViewController:imagePicker animated:YES completion:nil];
        }];
    }
}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    
    UIImage *image = [info valueForKey: UIImagePickerControllerOriginalImage];
    NSData *imageData = UIImageJPEGRepresentation(image, 0.1);
    
    [self.imgPhotoSelector setImage:[UIImage imageWithData:imageData]];
    [self.imgPhotoSelector setImage:[ViewsHelper roundImage:self.imgPhotoSelector].image];
    
    [self dismissViewControllerAnimated:YES completion:nil];
    
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissViewControllerAnimated:YES completion:nil];
}