I'm trying to load data from the firebase. I successfully load the data like usename and email, but somehow it fails to load the image. I'm attaching my code which I have used to load the data from firebase. Please help. thank you.
code :
import UIKit
import FirebaseDatabase
import Firebase
class ProfileVC: UIViewController {
#IBOutlet weak var currentphoto: UIImageView!
#IBOutlet weak var usernameLabel: UILabel!
#IBOutlet weak var BioOrEmailLabel: UILabel!
var databasereff : DatabaseReference!
override func viewDidLoad() {
super.viewDidLoad()
databasereff = Database.database().reference()
if let userid = Auth.auth().currentUser?.uid
{
databasereff.child("users").child(userid).observeSingleEvent(of: .value, with: { (snapshot) in
let dict = snapshot.value as? [String:Any]
let username = dict?["username"] as? String
let email = dict?["email"] as? String
if let photourl = dict?["profileimageUrl"] as? String
{
let url = URL(string: photourl)
URLSession.shared.dataTask(with: url!, completionHandler: { (data, response, error) in
if error != nil{
print(error?.localizedDescription)
return
}
OperationQueue.main.addOperation {
self.currentphoto.image = UIImage(data: data!)
}
}).resume()
}
self.usernameLabel.text = username
self.BioOrEmailLabel.text = email
})
{
(error) in
print(error.localizedDescription)
}
}
// Do any additional setup after loading the view.
}
}
You need to create FIRStorage reference to retrieve files from Firebase Data Base.
First:
import FirebaseStorage
Second take a storage reference:
var storage: FIRStorage!
Then Initialize it
storage = FIRStorage.storage()
Now:
let dbRef = database.reference().child("myFiles")
dbRef.observeEventType(.ChildAdded, withBlock: { (snapshot) in
// Get download URL from snapshot
let downloadURL = snapshot.value() as! String
// Create a storage reference from the URL
let storageRef = storage.referenceFromURL(downloadURL)
// Download the data, assuming a max size of 1MB (you can change this as necessary)
storageRef.dataWithMaxSize(1 * 1024 * 1024) { (data, error) -> Void in
// Create a UIImage, add it to the array
let pic = UIImage(data: data)
picArray.append(pic)
})
})
In your case path is different so just change the path and Cheers!
Reference: from here
Related
I was just wondering how would I be able to use a searched barcode to fetch using Core Data in Swift. I'm basically passing a barcode to a static func method, but how would I be able to use that to fetch the data from the Core Data?
Here is the barcode when detected:
func barcodeDetected(code: String) {
// Let the user know we've found something.
let alert = UIAlertController(title: "Found a Barcode!", message: code, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Search", style: UIAlertActionStyle.Destructive, handler: { action in
// Remove the spaces.
let trimmedCode = code.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
// EAN or UPC?
// Check for added "0" at beginning of code.
let trimmedCodeString = "\(trimmedCode)"
var trimmedCodeNoZero: String
if trimmedCodeString.hasPrefix("0") && trimmedCodeString.characters.count > 1 {
trimmedCodeNoZero = String(trimmedCodeString.characters.dropFirst())
// Send the doctored barcode
ProductDetailsViewController.searchCode(trimmedCodeNoZero)
} else {
// Send the doctored barcode
ProductDetailsViewController.searchCode(trimmedCodeString)
}
self.navigationController?.popViewControllerAnimated(true)
}))
self.presentViewController(alert, animated: true, completion: nil)
}
My Product Class:
import UIKit
import Foundation
import CoreData
class ProductDetailsViewController: UIViewController, NSFetchedResultsControllerDelegate {
#IBOutlet weak var productLabel: UILabel!
#IBOutlet weak var priceLabel: UILabel!
#IBAction func addProduct(sender: AnyObject) {
let AppDel = UIApplication.sharedApplication().delegate as? AppDelegate
let context:NSManagedObjectContext = (AppDel?.managedObjectContext)!
let ent = NSEntityDescription.entityForName("Products", inManagedObjectContext: context)
var newProduct = ProductItem(entity: ent!, insertIntoManagedObjectContext: context)
newProduct.title = productLabel.text
//newProduct.price = priceLabel.text
/*context.save(nil)
print(newProduct)
print("Object Saved")*/
}
private(set) var PRODUCT_NAME = ""
private(set) var PRODUCT_PRICE = ""
private var menuItems:[ProductItem] = []
static func searchCode(codeNumber: String) -> String{
let barcodeNumber = codeNumber
return barcodeNumber
}
deinit{
NSNotificationCenter.defaultCenter().removeObserver(self)
}
override func viewDidLoad() {
super.viewDidLoad()
productLabel.text = "Scan a Product"
priceLabel.text = ""
NSNotificationCenter.defaultCenter().addObserver(self, selector: "setLabels:", name: "ProductNotification", object: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
I already added the items into Core Data successfully and was able to load all items into a table in my app. Now with the barcode scanned I want to be able to just load the products with the barcode and i'm stuck on that part. As you can see my static fun searchCode is receiving the barcode from barcodeDetected but what should I do next to fetch it? Thanks.
EDIT:
Core Data Entity
import Foundation
import CoreData
#objc(ProductItem)
class ProductItem: NSManagedObject{
#NSManaged var barcodeNum:String?
#NSManaged var box_height:NSNumber?
#NSManaged var box_length:NSNumber?
#NSManaged var box_width:NSNumber?
#NSManaged var price:NSNumber?
#NSManaged var sku:String?
#NSManaged var weight:NSNumber?
#NSManaged var title:String?
}
To fetch the correct ProductItem, you need to use a predicate (see the Apple Documentation here). In your case, you could use something like this:
let AppDel = UIApplication.sharedApplication().delegate as? AppDelegate
let context:NSManagedObjectContext = (AppDel?.managedObjectContext)!
let fetchRequest = NSFetchRequest(entityName: "ProductItem")
fetchRequest.predicate = NSPredicate(format: "barcodeNum == %#",codeNumber)
let results = try! context.executeFetchRequest(fetchRequest) as! [ProductItem]
if results.count > 0 { // great, you found (at least one) matching item
let scannedProduct = results[0]
// from here you can access the attributes of the product
// such as title, price, sku, etc.
...
} else { // not found
...
}
Note that I've use try! for brevity, but in practice you should use proper do ... catch syntax and handle any errors.
I'm not clear why you are using a static func in the ProductDetailsViewController; a common approach would be to use the above fetch within your barcodeDetected method, and then to segue to the ProductDetailsViewController passing the relevant ProductItem for display/editing or whatever. Or to display an alert view if the product was not found.
I am building a recipe directory and I seem to be stuck with this part. I have images, string, files in a class on parse. When the user selects an appetizer (table view controller), a new view controller will appear with the image, name and the recipe (textview) from the file (already placed on parse).
What am I doing wrong?
class MyAppetizerRecipes: UIViewController {
#IBOutlet var imageView: UIImageView!
#IBOutlet var name: UILabel!
#IBOutlet var myTextView: UITextView!
var recipes = [String: PFFile]()
var appetizer = [String]()
var images = [String: UIImage]()
override func viewDidLoad() {
super.viewDidLoad()
let query = PFQuery(className: "Appetizers")
query.orderByAscending("recipe")
query.findObjectsInBackgroundWithBlock { (objects, error) in
guard error == nil, let objects = objects else {
print(error)
return
}
for object in objects {
// *********** ... Appetizer Name ....... ************* //
let appetizerName = object.objectForKey("appetizer") as! String
self.name.text = self.valuePassed
// *********** ... Recipe File on Parse ....... ************* //
let recipeFile = object["recipe"] as! PFFile
recipeFile.getDataInBackgroundWithBlock({ (recipeData, error) -> Void in
if error == nil {
let data = recipeData
self.recipes[appetizerName] = PFFile(data: data!)
} else {
print(error)
}
})
// *********** ... Image ....... ************* //
let imageFile = object["imageFiles"] as!PFFile
imageFile.getDataInBackgroundWithBlock({ (imageData, error) -> Void in
if error == nil {
let data = imageData
} else {
print(error)
}
if let data = imageData {
self.images[appetizerName] = UIImage(data: data)
self.imageView.image = self.images[self.valuePassed]
}
})
}
}
}
I am able to get an image and name of an appetizer, but not able to load text file from parse to UITextView.
I am trying to read/display an image from Firebase. I am first encoding the image and then posting this encoded String to Firebase. This runs fine. When I try and decode the encoded string from Firebase and convert it to an image, I am getting a nil value exception.
This is how I am saving the image to Firebase
var base64String: NSString!
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
self.dismissViewControllerAnimated(true, completion: nil)
imageToPost.image = image
var uploadImage = image as! UIImage
var imageData = UIImagePNGRepresentation(uploadImage)!
self.base64String = imageData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.Encoding64CharacterLineLength)
let ref = Firebase(url: "https://XXX.firebaseio.com")
var quoteString = ["string": self.base64String]
var usersRef = ref.childByAppendingPath("goalImages")
var users = ["image": quoteString]
usersRef.setValue(users)
displayAlert("Image Posted", message: "Your image has been successfully posted!")
}
This is how I am trying to read the image from Firebase
// ViewController.swift
import UIKit
import Firebase
class ViewController: UIViewController {
#IBOutlet weak var image: UIImageView!
var base64String: NSString!
#IBAction func buttonClicked(sender: AnyObject) {
sender.setTitle("\(sender.tag)", forState: UIControlState.Normal)
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let ref = Firebase(url: "https://XXX.firebaseio.com/goalImages/image/string")
ref.observeEventType(.Value, withBlock: { snapshot in
self.base64String = snapshot.value as! NSString
let decodedData = NSData(base64EncodedString: self.base64String as String, options: NSDataBase64DecodingOptions())
//Next line is giving the error
var decodedImage = UIImage(data: decodedData!)
self.image.image = decodedImage
}, withCancelBlock: { error in
print(error.description)
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
The error says: "fatal error: unexpectedly found nil while unwrapping an Optional value"; decodedData is nil. Could someone explain what is going wrong.
Instead of
let decodedData = NSData(base64EncodedString: self.base64String as String,
options: NSDataBase64DecodingOptions())
try adding IgnoreUnknownCharacters
NSDataBase64DecodingOptions.IgnoreUnknownCharacters
Use Example: Encode a jpg, store and read from firebase
encode and write our favorite starship
if let image = NSImage(named:"Enterprise.jpeg") {
let imageData = image.TIFFRepresentation
let base64String = imageData!.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
let imageRef = myRootRef.childByAppendingPath("image_path")
imageRef.setValue(base64String)
read and decode
imageRef.observeEventType(.Value, withBlock: { snapshot in
let base64EncodedString = snapshot.value
let imageData = NSData(base64EncodedString: base64EncodedString as! String,
options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)
let decodedImage = NSImage(data:imageData!)
self.myImageView.image = decodedImage
}, withCancelBlock: { error in
print(error.description)
})
EDIT 2019_05_17
Update to Swift 5 and Firebase 6
func writeImage() {
if let image = NSImage(named:"Enterprise.jpg") {
let imageData = image.tiffRepresentation
if let base64String = imageData?.base64EncodedString() {
let imageRef = self.ref.child("image_path")
imageRef.setValue(base64String)
}
}
}
func readImage() {
let imageRef = self.ref.child("image_path")
imageRef.observeSingleEvent(of: .value, with: { snapshot in
let base64EncodedString = snapshot.value as! String
let imageData = Data(base64Encoded: base64EncodedString, options: Data.Base64DecodingOptions.ignoreUnknownCharacters)!
let decodedImage = NSImage(data: imageData)
self.myImageView.image = decodedImage
})
}
Firebase Engineer here:
I highly recommend using the new Firebase Storage API for uploading images to Firebase. It's simple to use, low cost, and backed by Google Cloud Storage for huge scale.
You can upload from NSData or an NSURL pointing to a local file (I'll show NSData, but the principle is the same):
// Data in memory
let data: NSData = ...
// Create a reference to the file you want to upload
let riversRef = storageRef.child("images/rivers.jpg")
// Upload the file to the path "images/rivers.jpg"
let uploadTask = riversRef.putData(data, metadata: nil) { metadata, error in
if (error != nil) {
// Uh-oh, an error occurred!
} else {
// Metadata contains file metadata such as size, content-type, and download URL.
let downloadURL = metadata!.downloadURL
// This can be stored in the Firebase Realtime Database
// It can also be used by image loading libraries like SDWebImage
}
}
You can even pause and resume uploads, and you can easily monitor uploads for progress:
// Upload data
let uploadTask = storageRef.putData(...)
// Add a progress observer to an upload task
uploadTask.observeStatus(.Progress) { snapshot in
// Upload reported progress
if let progress = snapshot.progress {
let percentComplete = 100.0 * Double(progress.completedUnitCount) / Double(progress.totalUnitCount)
}
}
this is what i have so far:
import Foundation
import Parse
import UIKit
import Bolts
class SignUpViewController: UIViewController, UITextFieldDelegate {
#IBOutlet weak var statusLabel: UILabel!
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var passwordTextField: UITextField!
#IBOutlet weak var createAccountButton: UIButton!
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
emailTextField.delegate = self;
passwordTextField.delegate = self;
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func createAccountButtonPressed(sender: AnyObject) {
if verifyEmailDomain(self.emailTextField.text)
{
createAccount(self.emailTextField.text, password: self.passwordTextField.text)
}
else
{
//self.statusLabel.text = "Email domain is not valid.";
let alert = UIAlertView()
alert.title = "Invalid Email Domain"
alert.message = "Make sure you entered in your address correctly. If you did, ask your system about using PageMD! Thanks."
alert.addButtonWithTitle("Close")
alert.show()
}
}
func verifyEmailDomain(email: String) -> Bool
{
var isVerifiedDomain = false
let userDomain: String = (email.componentsSeparatedByString("#")).last!
//NSLog(userDomain)
let validDomainsFileLocation = NSBundle.mainBundle().pathForResource("ValidDomains", ofType: "txt")
var validDomainsFileContent = NSString(contentsOfFile: validDomainsFileLocation!, encoding: NSUTF8StringEncoding, error: nil)
// NSLog(validDomainsFileContent! as String)
let validDomains = validDomainsFileContent!.componentsSeparatedByString("\n")
for domain in validDomains
{
NSLog(domain as! NSString as String)
if userDomain == (domain as? NSString)
{
isVerifiedDomain = true
break
}
}
return isVerifiedDomain
}
func createAccount(email: String, password: String)
{
var newUser = PFUser()
newUser.username = email // We want the user to login only with their email.
newUser.email = email
newUser.password = password
newUser.signUpInBackgroundWithBlock { (succeeded: Bool, error: NSError?) -> Void in
if error == nil
{
// Account created successfully!
if succeeded == true
{
self.statusLabel.text = "Account created!"
}
}
else
{
if let errorField = error!.userInfo
{
self.statusLabel.text = (errorField["error"] as! NSString) as String
}
else
{
// No userInfo dictionary present
// Help from http://stackoverflow.com/questions/25381338/nsobject-anyobject-does-not-have-a-member-named-subscript-error-in-xcode
}
}
}
}
func textFieldShouldReturn(textField: UITextField) -> Bool
{
textField.resignFirstResponder()
return true;
}
}
when i run it i receive this in my terminal for xcode:
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
and highlighted in green is:
var validDomainsFileContent = NSString(contentsOfFile: validDomainsFileLocation!, encoding: NSUTF8StringEncoding, error: nil)
what can i do to avoid this error?
I'm trying to create a login that uses the emailVerified feature from parse but I keep receiving this error and cant save the email to the core or send the verification email to the user. What can i do to make this code work and stop the error from coming up?
In that case, the file at validDominsfileContent wasn't found. You need to make sure that the file is included in your Bundle.
To do that, open the Bundle-Resources:
Project > App target > Build Phases > Copy bundle resources
There you save your file. Now it should be found by Swift.
The code below checks Parse to see if an email address has been verified. I am able to retrieve the object ID from Core Data (I saved it in a previous view controller) but when it comes to query.getObjectInBackgroundWithId(userID), userID is for some reason nil. I get the error:
Error: no results matched the query (Code: 101, Version: 1.6.0)
import UIKit
import CoreData
class HomePage: UIViewController{
#IBOutlet var emailMessage: UILabel!
//var userID: String!
override func viewDidLoad() {
super.viewDidLoad()
var appDel:AppDelegate = (UIApplication.sharedApplication().delegate as AppDelegate)
var context:NSManagedObjectContext = appDel.managedObjectContext!
var request = NSFetchRequest(entityName: "Users")
request.returnsObjectsAsFaults = false
var results: NSArray = context.executeFetchRequest(request, error: nil)!
var res = results [0] as NSManagedObject
var userID = res.valueForKey("userID") as String
println (userID) //Correct ID is retrieved here
var query = PFQuery(className:"User")
query.getObjectInBackgroundWithId(userID) { //ID becomes nil
(email: PFObject!, error: NSError!) -> Void in
if error == nil {
let checkEmail = email["emailVerified"] as Bool
if (checkEmail != true)
{
self.emailMessage.hidden = false
}
else
{
self.emailMessage.hidden = true
}
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
I think the problem lies in the way you're getting a PFQuery for the user. You should use the special user query:
var query = PFUser.query()
See Users - Querying, in the Parse docs.
The User table (as well as all other parse-managed classes) in parse is prefixed by underscore, so you should fix this line:
var query = PFQuery(className:"_User")