處理將數據存儲在Firebase上並將數據加載到我的TableView中的應用程序。必須從我找到的教程中稍微更改(舊)代碼,以便我希望有人能夠發現我犯的錯誤。用戶可以添加一個事件:名稱,日期,描述(所有字符串)和圖像。這些數據被載入到三個「標籤」和圖像頂部。爲什麼我的代碼不工作? - setObjectForKey:key不能爲零
import UIKit
import Firebase
import FirebaseDatabaseUI
class EventViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
//outlets for text & image
@IBOutlet weak var photoImageView: UIImageView!
@IBOutlet weak var eventName: UITextField!
@IBOutlet weak var eventDate: UITextField!
@IBOutlet weak var eventDes: UITextView!
//Database connection
let rootref = FIRDatabase().reference()
var imagePicker: UIImagePickerController = UIImagePickerController()
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@IBAction func submitEvent(sender: AnyObject) {
let name = eventName.text
let date = eventDate.text
let text = eventDes.text
var data: NSData = NSData()
if let image = photoImageView.image {
data = UIImageJPEGRepresentation(image,0.1)!
}
let base64String = data.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.Encoding64CharacterLineLength)
let user: NSDictionary = ["name":name!, "date":date!, "text":text!, "photoBase64":base64String]
//Add firebase child node
let event = FIRDatabase().reference().child(name!)
// Write data to Firebase
event.setValue(user)
navigationController?.popViewControllerAnimated(true)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
view.endEditing(true)
super.touchesBegan(touches, withEvent: event)
}
//UIImagePickerControllerDelegate methods
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
imagePicker.dismissViewControllerAnimated(true, completion: nil)
photoImageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage
}
func imagePickerControllerDidCancel(picker: UIImagePickerController) {
dismissViewControllerAnimated(true, completion: nil)
}
@IBAction func addPicture(sender: AnyObject) {
if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)) {
imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .Camera
presentViewController(imagePicker, animated: true, completion: nil)
} else {
imagePicker.allowsEditing = false
imagePicker.sourceType = .PhotoLibrary
imagePicker.delegate = self
presentViewController(imagePicker, animated: true, completion:nil)
}
}
}
我TABLEVIEWCONTROLLER
import UIKit
import Firebase
class EventTableViewController: UITableViewController {
@IBOutlet weak var eventImage: UIImageView!
@IBOutlet weak var eventName: UILabel!
@IBOutlet weak var eventDate: UILabel!
@IBOutlet weak var eventText: UITextView!
let rootref = FIRDatabase().reference()
var items = [NSDictionary]()
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
items = [NSDictionary]()
FIRDatabase.load()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//TableView Data
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
configureCell(cell, indexPath: indexPath)
return cell
}
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
let dict = items[indexPath.row]
let name = dict["name"] as! String
// delete data from firebase
let event = FIRDatabase().reference().child(name)
event.removeValue()
}
}
// MARK:- Configure Cell
func configureCell(cell: UITableViewCell, indexPath: NSIndexPath) {
let dict = items[indexPath.row]
eventName.text = dict["name"] as? String
eventDate.text = dict["name"] as? String
eventText.text = dict["name"] as? String
let base64String = dict["photoBase64"] as! String
populateImage(cell, imageString: base64String)
}
func populateImage(cell:UITableViewCell, imageString: String) {
let decodedData = NSData(base64EncodedString: imageString, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)
let decodedImage = UIImage(data: decodedData!)
cell.imageView!.image = decodedImage
}
//load data from Firebase
func loadDataFromFirebase() {
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
rootref.observeEventType(.Value, withBlock: { snapshot in
var tempItems = [NSDictionary]()
for item in snapshot.children {
let child = item as! FIRDataSnapshot
let dict = child.value as! NSDictionary
tempItems.append(dict)
}
self.items = tempItems
self.tableView.reloadData()
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
})
}
}
IMAGE讓我的工作
這個。現在人們編寫代碼就好像'!'會在需要時奇蹟般地創建有效值! –
開始Swift程序員應該假裝強制 - 解包操作符不存在。在D&D術語中,在武器解鎖之前,您必須獲得一定數量的經驗值。 :) –
所以這裏最好的建議是刪除我所有的武力解開?但它一直給我一個錯誤,如果我刪除「!」...對不起,因爲在這裏的菜鳥它已經像一個星期已經試圖將這個應用程序連接到firebase :( 將在幾個小時內回家再次測試生病讓你更新.. – Orangez