[英]Can any one tell me why i am getting Bad authentication error while executing this code(Swift)?
[英]Can any one help me to solve this error using Swift
您能帮助我解决此错误吗?我正尝试从Firebase数据库下载图像,这是我的代码,并且为该错误放置了快照。 谢谢这是Xcode中错误的快照
import UIKit
import FirebaseDatabase
class ViewController: UIViewController , UITableViewDataSource , UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!
var ref:FIRDatabaseReference?
var Handle:FIRDatabaseHandle?
var myClass = [Post]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
ref=FIRDatabase.database().reference()
Handle = ref?.child("Posts").observe(.childAdded, with: { (snapshot) in
let post = snapshot.valueInExportFormat()
for url in post! as! [Post] { // Error Here
self.myClass.append(url)
self.tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return myClass.count
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)as? TableViewCell{
cell.MyImage.alpha = 0
cell.textLabel?.text = PostData[indexPath.row]
DispatchQueue.main.async(execute: {
let imgurl = URL(string : self.myClass [(indexPath as NSIndexPath).row].url)
let imgdata = NSData(contentsOf: imgurl!)
cell.MyImage.image = UIImage(data: imgdata as! Data)
UIView.animate(withDuration: 0.5, animations: {
cell.MyImage.alpha = 1
})
})
return cell
} else {
let cell = TableViewCell()
DispatchQueue.main.async(execute: {
let imgurl = URL(string : self.myClass [(indexPath as NSIndexPath).row].url)
let imgdata = NSData(contentsOf: imgurl!)
cell.MyImage.image = UIImage(data: imgdata as! Data)
})
return cell
}
}
}
})
}
也许你想要:
for url in post! {
var wrappedPost = Post()
wrappedPost.url = url
... use wrappedPost for whatever you need a Post object for
}
有时简单的方法就是走。
假设您具有Firebase结构
Planets
planet_4
some_text = "My post about Mars"
image_url = "images/mars.jpg"
planet_2
some_text = "My post about Venus"
image_url = "images/venus.jpg"
并假设我们要加载每个文本和图像并在表格视图中显示。 我们可以通过以下两种方式之一来完成此操作,一次使用.childAdded一次,或者一次使用.value一次。 在此示例中,我们将一次遍历它们。
let planetsRef = myRootRef.child("Planets")
planetsRef.observe(.childAdded, with: { snapshot in
let dict = snapshot.value as! [String: AnyObject]
let text = dict["text"]
let imageUrl = dict["image_url"]
// Create a reference to the file you want to download
let planetRef = storageRef.child(imageUrl) //storageRef is defined elsewhere
// Download in memory with a maximum allowed size
// of 1MB (1 * 1024 * 1024 bytes)
planetRef.dataWithMaxSize(1 * 1024 * 1024) { (data, error) -> Void in
if (error != nil) {
// Got an error so handle it
} else {
// Data for "images/some planet.jpg" is returned
// let planetImage: UIImage! = UIImage(data: data!)
// then add the text and the image to your dataSource array
// and reload your tableview.
}
})
})
这未经测试,但可以提供总体思路
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