Good one :) Thank you

For iOS11 and iPhone X: collectionView.setContentOffset(CGPoing(x: 0, y: -collectionView.safeAreaInsets.top), animated: true)

Yes, I have that. I went ahead and downloaded your project. I copied all of it and compared the code side by side. When I run your project it works, when I run mine (exactly the same) it doesn't. That really puzzled me..

if targetsize equal PHImageManagerMaximumSize it work pretty well, all the images resolution are pretty good but when fetch limit go over 10 the whole application crashes. Using PHImageManagerMaximumSize also receive a memory warning on the console.

i am currently using iphone 6 plus.

Wooooaaah :) What a speedy answer Brian! It is less than a minute ! Faster than billion dollar company :) Thank you very much.

It was around 22:00 here. I remember that I sent a support request a big tech learning company about something is not work. They answer me after 1h to say "hey it works on my computer" So they have coffee too but it was different ... :) Thanks again.

yes but it's not working. I'm on the wrong way i think

Here is the complete function : ( It's working for the fetch but not working the solve delay of image ) override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView { let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: headerId, for: indexPath) as! PhotoSelectorHeader header.photoImageView.image = selectedImage DispatchQueue.main.async { if let selectedImage = self.selectedImage { if let index = self.images.index(of: selectedImage) { let selectedAsset = self.assests[index] let imageManager = PHImageManager.default() let targetSize = CGSize(width: 600, height: 600) imageManager.requestImage(for: selectedAsset, targetSize: targetSize, contentMode: .default, options: nil, resultHandler: { (image, info) in header.photoImageView.image = image }) } } } return header }

So any advice for me?

Ow i think i didn't explain my self =) Everything is working correctly on my project. But when we select the image it'll bigger and target size will be 600 x 600 so image is loading a little bit for the getting sharp. I try to improve how can we shorten that time. After i asked this question i checked instagram app time is similar with our project.

I see :) I think best way the leave it current situation =) without dispatchQuene i mean =)

Thanks for the heads up

Found out that I forgot a condition for reloading collectionView after fetching photos : if count == allPhotos.count - 1 { DispatchQueue.main.async { self.collectionView?.reloadData() } }

Looking for the same! let me know if you find anything out there=)

var header: PhotoSelectorHeader? override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView { let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: headerId, for: indexPath) as! PhotoSelectorHeader self.header = header header.photoImageView.image = selectedImage if let selectedImage = self.selectedImage { if let index = self.images.index(of: selectedImage) { let selectedAsset = self.assets[index] let imageManager = PHImageManager.default() let options = PHImageRequestOptions() options.isSynchronous = true options.isNetworkAccessAllowed = true let targetSize = CGSize(width: 500, height: 500) imageManager.requestImage(for: selectedAsset, targetSize: targetSize, contentMode: .default, options: options, resultHandler: { (image, info) in header.photoImageView.image = image }) } } return header }

The reason it hangs a bit is because you're executing it from the main thread. You can try putting the code in the background just like the way you're fetching photos for the grid. And as for the blank header, I think it's because the code to fetch the image for the header is asynchronous. So the code will first "return header" which has no image in it. So, you can try setting header.photoImageView.image = image, just before the return, so that it will return some low-resolution image first and then when fetching the higher resolution image is done, you can update the header.

Thank you Brian :-) :-) I Love the way you response to Question :-) :-)

It's ok I've found my error, just forgot to put my "options" in requestImage method... - -' Have a nice day ! ;)

Wow , I'd had the same problem. And thanks to your following comment. I now solved the problem of fetching images twice of the option limit. thank you

Had the same issue and resolved after your comment, thanks!

That's true ! :)

Yeah, I fixed it. My bad. Really stupid mistake. But it is a good way to learn

I solved my problems. I didn't fetch all photos in fetchPhotos at once First, I retrieve PHAssetResult<PHAsset) from PHAsset.fetchAssets(with: .image, options: options) and reload UICollectionView Next, I fetch photo from PHAssetResult<PHAsset) at cellForItemAt, because we can access each element of PHAssetResult<PHAsset) by index (subscript is available) So there is no delay when fetching a lot of photos in real device Please comment below the your opinion about my way

Solved After spending several days trying to solve the problem I decided just to re write the whole code again and it worked I must have done something wrong when I was writing the code

Any idea ?