我有一个简单的 swift 应用程序，除了输入一些数据外，用户还可以在其中从图库中选择图像。单击保存，选择的图像应上传到 Firestore 存储。我实现了此处描述的相同逻辑https://firebase.google.com/docs/storage/ios/upload-files。当我调用“.putData(data, metadata: nil)”时，什么也没有发生，也没有返回错误。这是代码片段：
func uploadImage(imageView: UIImageView) -> String {
// Variable for my image url
var urlString: String
urlString = ""
storage = Storage.storage()
guard let image = imageView.image,
let imageData = image.jpegData(compressionQuality: 1.0) else {
print ("no image uploaded")
return ""
}
let imageName = String (Int64((NSDate().timeIntervalSince1970 * 1000.0).rounded())) + ".jpg"
let imageRef = storage.reference().child(Constants.IMAGES_PATH).child(imageName)
// QUOTE : THIS PART DOES NOT GIVE ANY FEEDBACK. NONE OF THE PRINTS INSIDE IT IS EXECUTED
let uploadTask = imageRef.putData(imageData, metadata: nil) { (metadata, error) in
if let error = error {
// Uh-oh, an error occurred!
print(error)
return
}
imageRef.downloadURL { (url, error) in
guard let downloadURL = url else {
print ("error")
return
}
urlString = downloadURL.absoluteString
print("Downloaded image URL ", urlString)
}
}
// UNQUOTE
print ("after uploadTask", imageRef.downloadURL) // THE URL IS ALWAYS EMPTY ""
return urlString
}
我设置了一个调试器断点，显示uploadTask里面的代码没有被执行，只是uploadTask被执行了，里面的所有东西都被跳过了。
选择图像后调用 uploadImage 函数，如下所示：
var image = uploadImage(imageView: imageView)
图像是在这里挑选的（这很好用）：
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let pickedImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
imageView.contentMode = .scaleAspectFit
imageView.image = pickedImage
print("image chosen")
}
dismiss(animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
dismiss(animated: true, completion: nil)
}
我是这样初始化的，应该没问题：
import UIKit
import os.log
import FirebaseFirestore
import Firebase
class DisplayMediumViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
var storage: Storage!
override func viewDidLoad() {
super.viewDidLoad()
// Additional setup after loading the view.
imagePicker.delegate = self
// Create tap gesture recognizer
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(DisplayMediumViewController.imageTapped(gesture:)))
// Aadd it to the image view;
imageView.addGestureRecognizer(tapGesture)
// Make sure imageView can be interacted with by user
imageView.isUserInteractionEnabled = true
}
我在互联网上搜索了很多并尝试了不同的方法来实现它，没有一个成功。如果有人提示为什么“uploadTask = imageRef.putData”不上传图像也不返回任何下载URL，那就太好了。