问Firebase REST API

EN

// Create a reference to the file you want to download
let starsRef = storageRef.child("images/stars.jpg")
// Fetch the download URL
starsRef.downloadURLWithCompletion { (URL, error) -> Void in
  if (error != nil) {
    // Handle any errors
  } else {
    // TODO: download from URL with a REST GET call
  }
}