How to get thumbnail and Original image from UIImagePickerViewcontroller? - ios

Question

After captured photo from camera, I was doing image compression For (400kb and 1 Mb), it look almost 3 seconds in iPhone 6 and less than a second in iPhone 6s.
Is there any way to get thumbnail and original image without doing manual compression?
Code used for image compression
Extension for UIImage
extension UIImage {
// MARK: - UIImage+Resize
func compressTo(_ expectedSizeInMb:Int) -> Data? {
let sizeInBytes = expectedSizeInMb * 1024 * 1024
var needCompress:Bool = true
var imgData:Data?
var compressingValue:CGFloat = 1.0
while (needCompress && compressingValue > 0.0) {
if let data:Data = jpegData(compressionQuality: compressingValue) {
if data.count < sizeInBytes {
needCompress = false
imgData = data
} else {
compressingValue -= 0.1
}
}
}
if let data = imgData {
if (data.count < sizeInBytes) {
return data
}
}
return nil
}
}
usage:
if let imageData = image.compressTo(1) {
print(imageData)
}

Answer 1

For images saved in Photos Library :
Try :
let phAsset = info[UIImagePickerController.InfoKey.phAsset] as! PHAsset
let options = PHImageRequestOptions()
options.deliveryMode = .fastFormat
options.isSynchronous = false
// you can change your target size to CGSize(width: Int , height: Int) any number you want.
PHImageManager.default().requestImage(for: phAsset, targetSize: PHImageManagerMaximumSize, contentMode: .default, options: options, resultHandler: { image , _ in
let thumbnail = image
// use your thumbnail
})
For Captured images from Camera, you can get image pixels without recalculating data count :
let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
// pixels are the same on each device’s camera
let widthPixels = image.size.width * image.scale
let heightPixels = image.size.height * image.scale
let sizeInBytes = 1024 * 1024
var thumbnail : UIImage! = nil
if Int(widthPixels * heightPixels) > sizeInBytes {
// assign custom width and height you need
let rect = CGRect(x: 0.0, y: 0.0, width: 100, height: 100)
UIGraphicsBeginImageContextWithOptions(rect.size, false, 1)
let context = UIGraphicsGetCurrentContext()
context?.interpolationQuality = .low
image.draw(in: rect)
let resizedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
thumbnail = resizedImage
} else {
thumbnail = image
}