how to get all images from phone in ios - ios

Question

I want to get all images from the phone.for create multiple selections in photos library.I am using below code to get all images from the phone. it's working perfectly but when on the phone have 1000 images its take more time to get all images and show on view.How to reduce the time of getting all images from the phone.
// get all images from photos
func getAllImagesFromPhotos() -> [Photos]?
{
let imgManager = PHImageManager.default()
let requestOptions = PHImageRequestOptions()
requestOptions.isSynchronous = true
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key:"creationDate", ascending: true)]
let fetchResult = PHAsset.fetchAssets(with: PHAssetMediaType.image, options: fetchOptions)
var allImages = [Photos]()
for index in 0..<fetchResult.count
{
let asset = fetchResult.object(at: index) as PHAsset
imgManager.requestImage(for: asset, targetSize: CGSize(width:200,height:200), contentMode: .aspectFill, options: requestOptions, resultHandler: { (uiimage, info) in
if let image = uiimage
{
allImages.append(Photos(image: image, selected: false))
}
})
}
return allImages
}

Answer 1

To solve your problem you want to actually batch the image loading, load 10 images at a time, and display them, when the user scrolls a bit more, load the next batch, etc..
if you load all images, then of course there will be an unavoidable performance hit.
what you want to use instead is the UIImagePickerController class from UIKit
Here is the documentation from apple on UIImagePickerController.
If you don't want to use UIImagePickerController, then you have to load a smaller set of images at a time and allow the users to "load more" by scrolling further on the selection view.
EDIT: Multi image selection
After reading your comment about wanting to select multiple images, it's clear that UIImagePickerController is made to select single images, however, you can just not dismiss it upon selection, and have a toast message saying "Image selected", when the user select an image, and not dismiss the view, allowing the user to select another image, etc.. if the user select the same image again, you may just show the toast again saying "Image removed" since you can verify if the image has already been selected from before.
if you don't want to implement that workaround, your only choice is to batch load images in smaller chunks of around 10 images or so as I recommended in the original answer.
however, If you really don't want to implement that yourself, i recommend using a 3rd party library, something like ELCImagePickerController for example, there are hundreds of other libraries that do just that.
Hope this helps, good luck