How to get original image using PHImageManager - ios

Question

I am using below code to get original image from PHAsset:
PHImageRequestOptions *requestOptions = [[PHImageRequestOptions alloc] init];
requestOptions.resizeMode = PHImageRequestOptionsResizeModeNone;
requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
[[PHImageManager defaultManager] requestImageForAsset:phasset
targetSize:PHImageManagerMaximumSize
contentMode:PHImageContentModeDefault
options:requestOptions
resultHandler:^void(UIImage *image, NSDictionary *info) {
if (image) {
}
}];
But found that, image size is greater than the original size. I picked 54 MB file but found its size 123.5MB in response.
Using below code to calculate image size:
NSData *imgData = UIImageJPEGRepresentation(image, 1.0);
NSLog(#"img size: %#", [[NSByteCountFormatter new] stringFromByteCount:imgData.length]);
Any idea how to get an original image using [[PHImageManager defaultManager] requestImageForAsset: API.

Answer 1

I am going to share my code in Swift 5.
In my case, the following code works well on iOS 14.5.1.
extension PHAsset {
func getImageData(_ index: Int, completionHandler: #escaping((_ index: Int, _ image: UIImage?)->Void)) {
let options = PHImageRequestOptions()
options.isSynchronous = true
options.isNetworkAccessAllowed = true
PHImageManager.default().requestImage(for: self, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFit, options: options, resultHandler: { (image, info) in
completionHandler(index, image)
})
}
}
Because I call getImageData in background thread and the return value is not correctly ordered, I use a variable named index for calling order and in turn, pass it to completionHanlder so that I can know from where the return value is.
If you don't need index variable, you can delete it.

Answer 2

I wrote a function to get original image below, it worked for me. Hope it works for you, too.
func getAssetThumbnail(asset: PHAsset) -> UIImage {
let manager = PHImageManager.default()
let option = PHImageRequestOptions()
var thumbnail = UIImage()
option.isSynchronous = true
option.isNetworkAccessAllowed = true
option.resizeMode = .none
manager.requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFit, options: option) { (result, info) in
thumbnail = result!
}
return thumbnail
}

Answer 3

Use following code to get original image. I have code in Swift, you should convert it to Objective-C
PHImageManager.default().requestImage(for: phAssets.firstObject!, targetSize: PHImageManagerMaximumSize, contentMode: PHImageContentMode.default, options: requestOption) { (image, dictResult) in
// Get file path url of original image.
if let url = dictResult!["PHImageFileURLKey"] as? URL {
self.getImageFromFileUrl(url)
}
}
func getImageFromFileUrl(_ fileUrl: URL) {
// Get dat from url, here I have not using catch block, you must use it for swift.
let imageData = try? Data(contentsOf: fileUrl)
// Get image from data
let image = UIImage(data: imageData!)
// Size count, which is same as original image
let size = ByteCountFormatter()
print("image size = \(size.string(fromByteCount: Int64(imageData!.count)))")
}
For details, I have added comment above the line of code.
I hope this will help you.