Image size increases after upload it to Firebase Storage - swift

Question

I uploaded an image of size 7.4 MB to the firebase storage, but I got 24.8 MB. Why this happen? And how may I solve it?
Notice: I did not create any changes in the size of the image, I kept it as it is.
Here is the code:
func storeImageInFirebase(){
let storeageRef = Storage.storage().reference()
let imageName = UUID().uuidString + ".jpg"
let imagesReference = storeageRef.child("images").child(imageName)
let imageData = self.imgView.image!.pngData()
let metaData = StorageMetadata()
metaData.contentType = "image/jpg"
imagesReference.putData(imageData!, metadata: metaData){ (metadate, error)
in
guard metadate != nil else{
print("Error: \(String(describing: error?.localizedDescription))")
return
}
// Fetch the download URL
imagesReference.downloadURL(completion: {(url, error)
in
if error != nil {
print("Faild to download url:", error!)
return
}else{
// show the url in real database
}
})
}
}

Answer 1

Try the below code. You can change maxCompression and maxFileSize to suit your needs. This will continue looping/compressing the file by increments of 0.05 while the image is bigger than your max size and while compression is higher than your max compression.
func storeImageInFirebase(image: UIImage) {
var compression: CGFloat = 0.9 //starting compression
let maxCompression: CGFloat = 0.05 //change to the maximum compression you want
let maxFileSize: Int = 512 * 512 //change to the maximum file size you want
guard var uploadImageData = image.jpegData(compressionQuality: compression) else {
print("ERROR: Creating photo data")
return
}
while (uploadImageData.count > maxFileSize) && (compression > maxCompression) {
compression -= 0.05
if let compressedImageData = image.jpegData(compressionQuality: compression) {
uploadImageData = compressedImageData
}
}
guard let uploadImageDataFinal = image.jpegData(compressionQuality: compression) else {
print("ERROR: Compressing final photo")
return
}
let imageName = UUID().uuidString
let storageRef = Storage.storage().reference().child("images").child(imageName)
let metadata = StorageMetadata()
metadata.contentType = "image/jpeg"
storageRef.putData(uploadImageDataFinal, metadata: metadata) { (metadata, err) in
if err != nil {
print("ERROR: Adding photo to storage")
return
} else {
//success
print("SUCCESS: Photo uploaded")
return
}
}
}
To download image add this function to the view controller:
func getImage(handler: #escaping(_ image: UIImage?) -> ()) {
let imageName = UUID().uuidString
let storageRef = Storage.storage().reference().child("images").child(imageName)
storageRef.getData(maxSize: 27 * 1024 * 1024) { (data, error) in
if let data = data, let image = UIImage(data: data) {
print("SUCCESS: downloaded image")
handler(image)
} else {
print("ERROR downloading image. \(error)")
handler(nil)
}
}
}
When you need to download the image use:
self.getImage { (returnedImage) in
if let image = returnedImage {
//use image here
}
}