Cloud Storage in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize a reference to the Firebase Storage root.

iOS Swift

let storage = Storage.storage()
let storageRef = storage.[1]

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Areference()

Bref()

CrootReference()

Droot()

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ref()' instead of 'reference()'.

Trying to use 'root()' which does not exist.

The correct method to get the root reference of Firebase Storage is reference().

2fill in blank

medium

Complete the code to upload data to a file named "image.jpg" in Firebase Storage.

iOS Swift

let data = Data()
let imageRef = storageRef.child("[1]")
imageRef.putData(data, metadata: nil) { metadata, error in
  // handle completion
}

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Aphoto.jpg

Bpicture.png

Cimage.jpg

Dimage.png

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'image.png' instead of 'image.jpg'.

Using a different file name like 'photo.jpg'.

The file name to upload is 'image.jpg' as specified in the instruction.

3fill in blank

hard

Fix the error in the code to download data from Firebase Storage with a maximum size of 1MB.

iOS Swift

let imageRef = storageRef.child("image.jpg")
imageRef.getData(maxSize: [1]) { data, error in
  if let data = data {
    // use data
  }
}

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A1024

B1024 * 1024

C1000000

D1_000_000_000

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1024 which is only 1KB.

Using 1_000_000 which is close but not exact bytes.

The maxSize parameter expects bytes. 1MB equals 1024 * 1024 bytes.

4fill in blank

hard

Fill both blanks to create a dictionary of file names and their sizes in bytes from metadata.

iOS Swift

var fileSizes = [String: Int64]()
for item in items {
  item.getMetadata { metadata, error in
    if let metadata = metadata {
      fileSizes[[1]] = metadata.[2]
    }
  }
}

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Aitem.name

Bitem.fullPath

Csize

DtotalBytes

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'item.fullPath' instead of 'item.name' for the file name.

Using 'totalBytes' instead of 'size' for the file size.

The file name is accessed by item.name and the size in bytes is metadata.size.

5fill in blank

hard

Fill all three blanks to delete a file named "oldfile.txt" from Firebase Storage and handle errors.

iOS Swift

let oldFileRef = storageRef.child("[1]")
oldFileRef.[2] { error in
  if let error = error {
    print("Failed to delete: \(error.localizedDescription)")
  } else {
    print("[3]")
  }
}

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Aoldfile.txt

Bdelete(completion:)

Cdelete

DFile deleted successfully

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'delete(completion:)' which is not the correct method call syntax.

Using a wrong file name or success message.

The file name is 'oldfile.txt', the method to delete is 'delete', and the success message is 'File deleted successfully'.