tap image to show but nothing come out except a black collectionview

[Toms]

hello~
tap image to show. but imageslideshow gives me a black VC, the collectionview which holds the images, has empty datasource??. while pretty sure gave no empty datasource. this sometimes happen, can anyone help?

below is my code:
1:
var imgSources = ImageSource
imgSources.removeAll()
for indexImgName in m.img_data {
imgSources.append(ImageSource.init(image: imgView.image!)); //this imgView show the image succeed!
imgView.hb_tapped {
self.handlePosterImgClicked(clickIndex:m.img_data.firstIndex(of: indexImgName)!,
referenceImgView: imgView,
imgSources: imgSources)
}
}
2,
var slideshowTransitioningDelegate: ZoomAnimatedTransitioningDelegate? = nil
3, tap image:
func handlePosterImgClicked(clickIndex:Int,referenceImgView:UIImageView,imgSources:[ImageSource]) {

    let fullScreenController = FullScreenSlideshowViewController()
    fullScreenController.inputs = imgSources
    fullScreenController.initialPage = clickIndex
    
    slideshowTransitioningDelegate = ZoomAnimatedTransitioningDelegate(imageView: referenceImgView, slideshowController: fullScreenController)
    fullScreenController.modalPresentationStyle = .custom
    fullScreenController.transitioningDelegate = slideshowTransitioningDelegate
    self.slideshowTransitioningDelegate?.referenceImageView = referenceImgView

    self.hb_getCurrentNav()!.present(fullScreenController, animated: true, completion: nil)
}

[Toms]

about my phone:
version:15.4.1
model: Xs
my app: ios, '11.0'

[Toms]

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