Print the size (megabytes) of Data in Swift

ios swift cocoa-touch nsdata foundation
user2512523 picture user2512523 · Mar 10, 2017 · Viewed 37.7k times · Source

I have a variable fileData of Data type and I am struggling to find how to print the size of this.

In the past NSData you would print the length but unable to do that with this type.

How to print the size of a Data in Swift?

Answer

Mozahler picture Mozahler · Mar 10, 2017

Use yourData.count and divide by 1024 * 1024. Using Alexanders excellent suggestion:

    func stackOverflowAnswer() {
      if let data = UIImagePNGRepresentation(#imageLiteral(resourceName: "VanGogh.jpg")) as Data? {
      print("There were \(data.count) bytes")
      let bcf = ByteCountFormatter()
      bcf.allowedUnits = [.useMB] // optional: restricts the units to MB only
      bcf.countStyle = .file
      let string = bcf.string(fromByteCount: Int64(data.count))
      print("formatted result: \(string)")
      }
    }

With the following results:

There were 28865563 bytes
formatted result: 28.9 MB

Related questions

How would I create a UIAlertView in Swift?

I have been working to create a UIAlertView in Swift, but for some reason I can't get the statement right because I'm getting this error: Could not find an overload for 'init' that accepts the supplied arguments Here is how …

Read More
Move textfield when keyboard appears swift

I'm using Swift for programing with iOS and I'm using this code to move the UITextField, but it does not work. I call the function keyboardWillShow correctly, but the textfield doesn't move. I'm using autolayout. override func viewDidLoad() { super.viewDidLoad() …

Read More
Generate a UUID on iOS from Swift

In my iOS Swift app I want to generate random UUID (GUID) strings for use as a table key, and this snippet appears to work: let uuid = CFUUIDCreateString(nil, CFUUIDCreate(nil)) Is this safe? Or is there perhaps a better (…

Read More