ios - 从 Firebase 上传和检索照片
<p><p>我已经构建了应用程序，它显示在书籍的 UITableView 数据中。一切都很完美，我唯一需要的是这本书的照片。要上传和检索照片，我使用 Firebase，但我不知道如何处理照片。 </p>
<p>这是我已经实现的:</p>
<pre><code>@IBAction func ButtonScatta(_ sender: UIButton) {
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.camera;
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)
}
}
@IBAction func ButtonScegli(_ sender: UIButton) {
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary;
imagePicker.allowsEditing = true
self.present(imagePicker, animated: true, completion: nil)
}
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: !) {
ImageView.image = image
self.dismiss(animated: true, completion: nil);
}
</code></pre>
<p>这就是“Vendi”按钮的功能:</p>
<pre><code>if let user = FIRAuth.auth()?.currentUser{
self.emailUser.text = user.email
let userID: String = user.uid
let x = libriArray.count
let y = String(x+1)
//let imageLibro: UIImage = self.ImageView.image!
let emailVenditore: String = self.emailUser.text!
let titoloLibro: String = self.TitoloText.text!
let codiceLibro: String = self.ISBNText.text!
let prezzoLibro: String = self.PrezzoText.text!
let edizioneLibro: String = self.EdizioneText.text!
let statoLibro: Bool = false
let Libro = ["titolo": titoloLibro, "codice": codiceLibro, "prezzo": prezzoLibro, "autore": edizioneLibro, "emailUser": emailVenditore, "userID": userID, "stato": statoLibro] as
let libriRef = ref.child(byAppendingPath: "Libri")
var libri =
libriRef.childByAutoId().setValue(Libro)
self.dismiss(animated: true, completion: nil)
}else {
}
</code></pre>
<p>有人可以写并解释如何上传和检索这些照片吗？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我很难用这些 var 名称准确跟踪您在做什么。但是，我假设您从 imagePickerController 获得了 <code>UIImage</code>。</p>
<p>您将需要 Firebase Storage (<code>pod 'Firebase/Storage'</code>) 和相应文件中的 <code>import FirebaseStorage</code>。</p>
<p>您可以执行以下操作将 <code>UIImage</code> 上传到 Firebase 存储:</p>
<pre><code>func uploadPhoto(_ image: UIImage, completionBlock: @escaping () -> Void) {
let ref = FIRStorage.storage().reference().child("myCustomPath").child("myFileName.jpg") // you may want to use UUID().uuidString + ".jpg" instead of "myFileName.jpg" if you want to upload multiple files with unique names
let meta = FIRStorageMetadata()
meta.contentType = "image/jpg"
// 0.8 here is the compression quality percentage
ref.put(UIImageJPEGRepresentation(image, 0.8)!, metadata: meta, completion: { (imageMeta, error) in
if error != nil {
// handle the error
return
}
// most likely required data
let downloadURL = imageMeta?.downloadURL()?.absoluteString // needed to later download the image
let imagePath = imageMeta?.path // needed if you want to be able to delete the image later
// optional data
let timeStamp = imageMeta?.timeCreated
let size = imageMeta?.size
// ----- should save these data in your database at this point -----
completionBlock()
})
}
</code></pre>
<p>这是一个简单的函数，可以将 <code>UIImage</code> 上传到 Firebase 存储。请注意，您应该跟踪 downloadURL 和您上传的每张图片的路径。您可以在任何上传后将它们保存在数据库中。</p>
<p>要下载您上传的图片，您可以执行以下操作:</p>
<pre><code>func retrieveImage(_ URL: String, completionBlock: @escaping (UIImage) -> Void) {
let ref = FIRStorage.storage().reference(forURL: URL)
// max download size limit is 10Mb in this case
ref.data(withMaxSize: 10 * 1024 * 1024, completion: { retrievedData, error in
if error != nil {
// handle the error
return
}
let image = UIImage(data: retrievedData!)!
completionBlock(image)
})
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 从 Firebase 上传和检索照片，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/41313669/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/41313669/
</a>
</p>
页:
[1]