How to get image file size in Swift?

问题:

I am using

UIImagePickerControllerDelegate,
UINavigationControllerDelegate,
UIPopoverControllerDelegate

these delegates for choosing image from my gallery or my camera. So, how can I get image file size after choosing an image?

I want to use this:

let filePath = "your path here"
    var fileSize : UInt64 = 0

    do {
        let attr : NSDictionary? = try NSFileManager.defaultManager().attributesOfItemAtPath(filePath)

        if let _attr = attr {
            fileSize = _attr.fileSize();
            print(fileSize)
        }
    } catch {
    }

but here I need a path, but how can I get without a path, just by image file?

回答1:

  var image = info[UIImagePickerControllerOriginalImage] as! UIImage
    var imgData: NSData = NSData(data: UIImageJPEGRepresentation((image), 1)) 
// var imgData: NSData = UIImagePNGRepresentation(image) 
// you can also replace UIImageJPEGRepresentation with UIImagePNGRepresentation.
    var imageSize: Int = imgData.length
    print("size of image in KB: %f ", Double(imageSize) / 1024.0)

回答2:

Swift 3/4:

if let imageData = UIImagePNGRepresentation(image) {
     let bytes = imageData.count
     let kB = Double(bytes) / 1000.0 // Note the difference
     let KB = Double(bytes) / 1024.0 // Note the difference
}

Please note the difference between kB and KB. Answering here because in my case we had an issue while we considered kilobyte as 1024 bytes but server side considered it as 1000 bytes which caused an issue. Link to learn more.

PS. Almost sure you'll go with kB (1000).

回答3:

Swift 3

let uploadData = UIImagePNGRepresentation(image)
let array = [UInt8](uploadData)
print("Image size in bytes:\(array.count)")

回答4:

let selectedImage = info[UIImagePickerControllerOriginalImage] as!  UIImage 
let selectedImageData: NSData = NSData(data:UIImageJPEGRepresentation((selectedImage), 1)) 
let selectedImageSize:Int = selectedImageData.length 
print("Image Size: %f KB", selectedImageSize /1024.0)

回答5:

let data = UIImageJPEGRepresentation(image, 1)
let imageSize = data?.count

Duplicate of How to get the size of a UIImage in KB?

回答6:

let imageData = UIImageJPEGRepresentation(image, 1)
let imageSize = imageData?.count

UIImageJPEGRepresentation — returns the Data object for the specified image in JPEG format. The value 1.0 represents the least compression (close to original image).

imageData?.count — return data length (chars count equals bytes).

Important! UIImageJPEGRepresentation or UIImagePNGRepresentation will not return the original image. But if use given Data as source for uploading - than file size be the same as on the server (even using compression).

回答7:

Try this

import Darwin

...    

let size = malloc_size(&_attr)