call child data from firebase - xcode

Good evening,
I am trying to call data to post onto a card very similar to tinder. When I run my code, everything works and I see the print statement in the console. However the card view shows a default image with default text.
I was wondering if anyone has encountered this issue and could possibly help explain what I am doing wrong.
fileprivate func fetchUsersFromDatabase() {
Database.database().reference().child("JobPost").observeSingleEvent(of: .value, with: {(Snapshot) in
if let eachDict = Snapshot.value as? NSDictionary{
for each in eachDict{
//I think the issue is caused by the let post = poster
let post = Poster(dictionary: Snapshot.value as! [String : Any])
self.cardViewModels.append(post.toCardViewModel())
print(each.value )
}
}
self.setupDummyCards()
}, withCancel: {(Err) in
})
}
// the struct is in an extension file.
struct Poster: ProducesCardViewModel{
var jobName : String?
var price: Int?
var postName: String?
var ImageUrl1: String?
var uid: String?
init(dictionary: [String: Any]) {
self.price = dictionary["cost"] as? Int
self.jobName = dictionary["category"] as? String
self.postName = dictionary["description"] as? String ?? ""
self.ImageUrl1 = dictionary["JobImageUrl"] as? String ?? ""
self.uid = dictionary["fromId"] as? String ?? ""
}
func toCardViewModel() -> CardViewModel {
let attributedText = NSMutableAttributedString(string: jobName ?? "", attributes: [.font: UIFont.systemFont(ofSize: 32, weight: .heavy)])
let priceString = price != nil ? "\(price!)" : "N\\A"
attributedText.append(NSAttributedString(string: " \(priceString)", attributes: [.font: UIFont.systemFont(ofSize: 24, weight: .regular)]))
let jobString = jobName != nil ? jobName! : "Not available"
attributedText.append(NSAttributedString(string: "\n\(jobString)", attributes: [.font: UIFont.systemFont(ofSize: 20, weight: .regular)]))
return CardViewModel(imageNames: [ImageUrl1 ?? "" ], attributedString: attributedText, textAlignment: .left)
}
}
Example
// toCardViewModel
import UIKit
protocol ProducesCardViewModel {
func toCardViewModel() -> CardViewModel
}
class CardViewModel {
let JobimageName: [String]
let attributedString: NSAttributedString
let textAlignment: NSTextAlignment
init(imageNames: [String], attributedString: NSAttributedString, textAlignment: NSTextAlignment) {
self.JobimageName = imageNames
self.attributedString = attributedString
self.textAlignment = textAlignment
}
fileprivate var imageIndex = 0 {
didSet {
let imageName = JobimageName[imageIndex]
let image = UIImage(named: imageName)
imageIndexObserver?(imageIndex, image)
}
}
var imageIndexObserver: ((Int, UIImage?) -> ())?
func advanceToNextPhoto() {
imageIndex = min(imageIndex + 1, JobimageName.count - 1)
}
func goToPreviousPhoto() {
imageIndex = max(0, imageIndex - 1)
}
}
Thank you in advance!
// P.S I previously posted this question without lack of sufficient detail. I decided to just re post it with the quality material. I really appreciate your time.

I have figured out an answer and it was quite obvious to me. I noticed that
print(each.value )
would print the value, so I just substituted
let post = Poster(dictionary: Snapshot.value as! [String : Any])
to
let post = Poster(dictionary: each.value as! [String : Any])
and everything started to work just fine!

Related

Why my QR Code Generator only show one value

I have a project need to create qr code generator and i want to show more than one value when customer insert their information.
My Qr Code generator have some information field to let customer insert their infomation, but i added these field and test out, it only show one value, and i don' know why other values didn't show, maybe i just missed some part in the code, i don't know where is the problem, any expert knows what happened?
Example of the Code:
import Foundation
import SwiftUI
import CoreImage.CIFilterBuiltins
struct GenerateQRCode: View {
#State var first = "D3"
#State var id = "abcafewrqr
#Binding var time: Date"
let filter = CIFilter.qrCodeGenerator()
let cont = CIContext()
var dateFormatter: DateFormatter {
let df = DateFormatter()
df.dateFormat = "HH:mm"
return df
}
var body: some View {
NavigationView{
Image(uiImage: GenerateTime(first: first, id: id, time: time))
.interpolation(.none)
.resizable()
.frame(width: 150, height: 150, alignment: .center)
}.navigationBarBackButtonHidden(true)
}
func GenerateTime(first: String, id: String, time: Date)-> UIImage {
let str = dateFormatter.string(from: time)
let all = first + id + str
let com = all.data(using: .utf8)
filter.setValue(com, forKey: "inputMessage")
if let qr = filter.outputImage {
if let qrImage = cont.createCGImage(qr, from: qr.extent){
return UIImage(cgImage: qrImage)
}
}
return UIImage(systemName: "xmark") ?? UIImage()
}
}
Update:
func GenerateTime(first: String, id: String, time: Date)-> UIImage {
let str = dateFormatter.string(from: time)
let timeData = str.data(using: .utf8)
let idData = id.data(using: .utf8)
let firstData = first.data(using: .utf8)
let com = firstData, idData, TimeData //<--Here Updated
filter.setValue(com, forKey: "inputMessage")
if let qr = filter.outputImage {
if let qrImage = cont.createCGImage(qr, from: qr.extent){
return UIImage(cgImage: qrImage)
}
}
return UIImage(systemName: "xmark") ?? UIImage()
}
CombineString like above what i did, is it right?
Do you mean you get only one data from the 3 dates you've set in the QR code generator when scanning the resulting QR code?
If yes, then here is your problem:
filter.setValue(firstData, forKey: "inputMessage")
filter.setValue(idData, forKey: "inputMessage")
filter.setValue(timeData, forKey: "inputMessage")
You are suppose to set inputMessage once. Each subsequent setValue call will overwrite the previous.
You should format the 3 dates into one String and set inputMessage only once.

Storing/retriving a Codable Dictionary of structs in UserDefaults doesn't work for me

Swift (v 5/5.1) newbie here, having a hard time with Codables...hoping to get some advise from the experts here.
Okay, I have a simple dictionary from struct where the key is a string. I want to store the dictionary in UserDefaults (and later retrieve). There are some quite similar questions here, but these are mainly addressing nested struct's.
First attempt (error handling removed for simplicity):
public struct PriceStruct:Codable {
var myPrice: Double
var myTime: TimeInterval
var selected: Bool
var direction: Int
var myHigh, myLow: Double
enum CodingKeys: String, CodingKey {
case myPrice = "myPrice"
case myTime = "myTime"
case selected = "selected"
case direction = "direction"
case myHigh = "myHigh"
case myLow = "myLow"
}
}
var myPrices: [String: PriceStruct] = [:]
// [fill myPrices with some data...]
func savePrices() {
// error: Attempt to set a non-property-list object
UserDefaults.standard.set(myPrices, forKey: "prices")
}
func loadPrices() {
// obviously this doesn't work either
let myPrices = UserDefaults.standard.data(forKey: "prices")
}
While I assumed from the documentation, that UserDefaults is capable of storing dictionaries, it doesn't - at least for me.
Next thing I tried was using JSONEncoder like this:
// this time with prior JSON encoding
func savePrices() {
// this works
let json = try! JSONEncoder().encode(myPrices)
UserDefaults.standard.set(json as Data, forKey: "prices")
}
func loadPrices() {
// this doesn't work
let json = UserDefaults.standard.data(forKey: "prices")
let decoder = JSONDecoder()
let decoded = try! decoder.decode(PriceStruct.self, from json!)
}
Unfortunately I'm getting an error when trying to load data back from UserDefaults:
Swift.DecodingError.keyNotFound(CodingKeys(stringValue: "myPrice", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: \"myPrice\", intValue: nil) (\"myPrice\").", underlyingError: nil))
Other variants I tried is converting the encoded JSON to an UTF8 encoded string and storing/retrieving this one:
func savePrices() {
// this works too
let json = try! JSONEncoder().encode(myPrices)
UserDefaults.standard.set(String(data: json, encoding: .utf8), forKey: "prices")
}
func loadPrices() {
// and this doesn't work either
let json = UserDefaults.standard.string(forKey: "prices")!.data(using: .utf8)
}
So, from the error raised, CodingKeys seems to be the root of the problem. I tried to switch over using NSKeyedArchiver and NSKeyedUnarchiver` with no success.
I'm really wondering if there is a simple/universal solution to save/load a Dictionary in UserDefaults?
All your comments and suggestions are appreciated. Thanks!
I tried with the below code in my project that will work for me.
User Model
public protocol UserModel: Codable, PrimaryKey {
var id: String { get }
var firstName: String? { get }
var lastName: String? { get }
var userName: String? { get }
var emails: [String] { get }
}
public struct User: UserModel {
public let id: String
public let firstName: String?
public let lastName: String?
public let userName: String?
public let emails: [String]
public enum CodingKeys: String, CodingKey {
case id = "Id"
case firstName = "FirstName"
case lastName = "LastName"
case userName = "UserName"
case emails = "Emails"
}
public init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
do {
self.id = try container.decode(String.self, forKey: .id)
self.firstName = try container.decodeIfPresent(String.self, forKey: .firstName)
self.lastName = try container.decodeIfPresent(String.self, forKey: .lastName)
self.userName = try container.decodeIfPresent(String.self, forKey: .userName)
self.emails = try container.decodeIfPresent([String].self, forKey: .emails) ?? []
}
catch let error {
debugPrint(error)
throw error
}
}
}
I have stored in userDefault using below way
User Data Class
class UserData: NSObject
{
let userDefaultKey = "user_information"
var userData: User?
func getDictionary() -> [String: Data]
{
var dicInfo = [String: Data]()
do
{
let _userData = try JSONEncoder().encode(userData)
dicInfo["userData_default"] = _userData
}catch let error{
print("error while save data in User Default: \(error.localizedDescription)")
}
return dicInfo
}
func saveToDefault()
{
let userDefault = UserDefaults.standard
userDefault.set(getDictionary(), forKey: userDefaultKey)
userDefault.synchronize()
}
func loadFromDefault()
{
let userDefault = UserDefaults.standard
if let dicInfo = userDefault.object(forKey: userDefaultKey) as? [String: Data]
{
update(dicInfo)
}
}
func update(_ dictionaryInfo: [String: Data])
{
do
{
if let _userData_data = dictionaryInfo["userData_default"]
{
if let _userData = try? JSONDecoder().decode(User.self, from: _userData_data) {
userData = _userData
}
}
saveToDefault()
}catch let error{
print("error while load From Default data in User Default: \(error.localizedDescription)")
}
}
}
Hope this will help you.

upload collection view images into server using swift

I'm developing an app which has UICollectionView as like #zhangao0086/DKImagePickerController# example in Github. Now i need to upload the displayed UICollectionviewCell images into server. Can any one suggest me the right tuts for uploading. Thanks in advance.
UICollectionView code as follows:
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let asset = self.assets![indexPath.row]
var cell: UICollectionViewCell?
var imageView: UIImageView?
if asset.isVideo {
cell = collectionView.dequeueReusableCellWithReuseIdentifier("CellVideo", forIndexPath: indexPath)
imageView = cell?.contentView.viewWithTag(1) as? UIImageView
} else {
cell = collectionView.dequeueReusableCellWithReuseIdentifier("CellImage", forIndexPath: indexPath)
imageView = cell?.contentView.viewWithTag(1) as? UIImageView
}
if let cell = cell, imageView = imageView {
let layout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
let tag = indexPath.row + 1
cell.tag = tag
asset.fetchImageWithSize(layout.itemSize.toPixel(), completeBlock: { image, info in
if cell.tag == tag {
imageView.image = image
}
})
}
return cell!
}
uploading the image into server
func barButtonItemClicked(barButtonItem: UIBarButtonItem)
{
let myUrl = NSURL(string: "http://moneymonkey.tokiiyo.com/api/signature");
let typeItem: InsuranceType = InsuranceManager.sharedInstance.TypeArray[0]
let compItem: Companies = InsuranceManager.sharedInstance.CompArray[0]
let request = NSMutableURLRequest(URL:myUrl!);
request.HTTPMethod = "POST";
let param = [
"api_key" : "AiK58j67",
"api_secret" : "a#9rJkmbOea90-",
"phone" : "\(mobile)",
"policy_type" : "\(typeItem.name)",
"company" : "\(compItem.cname)"
]
print("Policy_type: \(typeItem.name)")
let boundary = generateBoundaryString()
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
let imageData = UIImagePNGRepresentation(?) //here what imageView
if(imageData==nil) { return; }
request.HTTPBody = createBodyWithParameters(param, filePathKey: "file", imageDataKey: imageData!, boundary: boundary)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in
if error != nil {
print("error=\(error)")
return
}
// You can print out response object
print("******* response = \(response)")
// Print out reponse body
let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
print("****** response data = \(responseString!)")
do{
_ = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary
dispatch_async(dispatch_get_main_queue(),{
});
}
catch
{
// report error
print("Oops!! Something went wrong\(error)")
}
}
task.resume()
}
func createBodyWithParameters(parameters: [String: String]?, filePathKey: String?, imageDataKey: NSData, boundary: String) -> NSData {
let body = NSMutableData();
if parameters != nil {
for (key, value) in parameters! {
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.appendString("\(value)\r\n")
}
}
let filename = "image.png"
let mimetype = "image/png"
body.appendString("--\(boundary)\r\n")
body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
body.appendString("Content-Type: \(mimetype)\r\n\r\n")
body.appendData(imageDataKey)
body.appendString("\r\n")
body.appendString("--\(boundary)--\r\n")
return body
}
func generateBoundaryString() -> String {
return "Boundary-\(NSUUID().UUIDString)"
}
J
you can use Alamofire https://github.com/Alamofire/Alamofire
Use like this :
Alamofire.upload(.POST, "YourURl", file: YourFile)
.progress { bytesWritten, totalBytesWritten, totalBytesExpectedToWrite in
print(totalBytesWritten)
// This closure is NOT called on the main queue for performance
// reasons. To update your ui, dispatch to the main queue.
dispatch_async(dispatch_get_main_queue()) {
print("Total bytes written on main queue: \(totalBytesWritten)")
}
}
.responseJSON { response in
debugPrint(response)
}

iOS 9(Swift 2.0): cannot invoke 'dataTaskwithURL' with an argument list of type '(NSURL, (_, _,_)throws -> Void)'

My app works perfectly fine with iOS 8 but yesterday I upgraded to iOS 9 and Xcode 7 then my app crashes. The error message is cannot invoke 'dataTaskwithURL' with an argument list of type '(NSURL, (_, ,)throws -> Void)'. I googled it and found a similar question here but the solution didn't really work (the solution was to add the do/catch blocks around the code). Can anyone help me with mine problem? Thank you!!!
Here's my code
import UIKit
import Foundation
import CoreLocation
class GoogleDataProvider {
let apiKey = "AIzaSyCQo-clIkek87N99RVh2lmFX9Mu9QPhAtA"
let serverKey = "AIzaSyBzmv7wPFcPAe1ucy5o6dqaXnda9i9MqjE"
var photoCache = [String:UIImage]()
var placesTask = NSURLSessionDataTask()
var session: NSURLSession {
return NSURLSession.sharedSession()
}
func fetchPlacesNearCoordinate(coordinate: CLLocationCoordinate2D, radius:Double, types:[String],keyword:String, completion: (([GooglePlace]) -> Void)) -> ()
{
var urlString = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?key=\(serverKey)&location=\(coordinate.latitude),\(coordinate.longitude)&radius=\(radius)&keyword=\(keyword)&rankby=prominence&sensor=true"
let typesString = types.count > 0 ? types.joinWithSeparator("|") : "food"
urlString += "&types=\(typesString)"
urlString = urlString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
if placesTask.taskIdentifier > 0 && placesTask.state == .Running {
placesTask.cancel()
}
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
do{
//******************Here's the line that displays error
placesTask = session.dataTaskWithURL(NSURL(string: urlString)!) {
(data, response, error) -> Void in
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
var placesArray = [GooglePlace]()
if let json = try NSJSONSerialization.JSONObjectWithData(data!, options:[]) as? NSDictionary {
if let results = json["results"] as? NSArray {
for rawPlace:AnyObject in results {
let place = GooglePlace(dictionary: rawPlace as! NSDictionary, acceptedTypes: types)
placesArray.append(place)
if let reference = place.photoReference {
self.fetchPhotoFromReference(reference) { image in
place.photo = image
}
}
}
}
}
dispatch_async(dispatch_get_main_queue()) {
completion(placesArray)
}
}
}catch{
}
placesTask.resume()
}
func fetchDirectionsFrom(from: CLLocationCoordinate2D, to: CLLocationCoordinate2D, completion: ((String?) -> Void)) -> ()
{
let urlString = "https://maps.googleapis.com/maps/api/directions/json?key=\(serverKey)&origin=\(from.latitude),\(from.longitude)&destination=\(to.latitude),\(to.longitude)&mode=walking"
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
do{
//******************************Here too ****************************
session.dataTaskWithURL(NSURL(string: urlString)!) {
(data, response, error) -> Void in
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
var encodedRoute: String?
if let json = try NSJSONSerialization.JSONObjectWithData(data!, options:[]) as? [String:AnyObject] {
if let routes = json["routes"] as AnyObject? as? [AnyObject] {
if let route = routes.first as? [String : AnyObject] {
if let polyline = route["overview_polyline"] as AnyObject? as? [String : String] {
if let points = polyline["points"] as AnyObject? as? String {
encodedRoute = points
}
}
}
}
}
dispatch_async(dispatch_get_main_queue()) {
completion(encodedRoute)
}
}.resume()
}catch{
}
}
}
Sorry this is my first time posting the code style is a little bit confusing sorry about the indentation mess :)
Thanks again!!!
dataTaskWithURL:completionHandler: does not throw error.
Put do and catch inside dataTaskWithURL method.
for example:
session.dataTaskWithURL(NSURL(string: urlString)!) {
(data, response, error) -> Void in
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
var encodedRoute: String?
do {
if let json = try NSJSONSerialization.JSONObjectWithData(data!, options:[]) as? [String:AnyObject] {
if let routes = json["routes"] as AnyObject? as? [AnyObject] {
if let route = routes.first as? [String : AnyObject] {
if let polyline = route["overview_polyline"] as AnyObject? as? [String : String] {
if let points = polyline["points"] as AnyObject? as? String {
encodedRoute = points
}
}
}
}
}
} catch {
}
dispatch_async(dispatch_get_main_queue()) {
completion(encodedRoute)
}
}.resume()

Swift 2.0: Could not find overload. Need Explanation

I have the following code in my program.
var detailItem: RSSItem? {
didSet {
self.configureView()
}
}
func configureView() {
if let item: RSSItem = self.detailItem
{
if let webView = self.itemWebView
{
if let templateURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("template", ofType: "html")!)?
{
if var template = NSString(contentsOfURL: templateURL, encoding: NSUTF8StringEncoding)?
{
if let title = item.title
{
template = template.stringByReplacingOccurrencesOfString("###TITLE###", withString: title)
}
if let content = item.content
{
template = template.stringByReplacingOccurrencesOfString("###CONTENT###", withString: content)
}
else if let description = item.itemDescription
{
template = template.stringByReplacingOccurrencesOfString("###CONTENT###", withString: description)
}
if let date = item.pubDate
{
var formatter = NSDateFormatter()
formatter.dateFormat = "MMM dd, yyyy"
template = template.stringByReplacingOccurrencesOfString("###DATE###", withString: formatter.stringFromDate(date))
}
if let author = item.author
{
template = template.stringByReplacingOccurrencesOfString("###AUTHOR###", withString: author)
}
webView.loadHTMLString(template, baseURL: nil)
}
}
else
{
if let content = item.content
{
webView.loadHTMLString(content, baseURL: nil)
}
else if let description = item.itemDescription
{
webView.loadHTMLString(description, baseURL: nil)
}
}
}
}
}
On the line:
if let templateURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("template", ofType: "html")!)?
I get the following error:
-Could not find an overload for 'pathForResource' that accepts the supplied arguments
Can someone explain this error to me and maybe suggest a solution. I have been reading through various searches on Google but can't quite seem to get what I need.
Thanks in advance.
NSURL(fileURLWithPath:) is now return a NSURL so just don't use if let here.
#available(iOS 2.0, *)
init(fileURLWithPath path: String, isDirectory isDir: Bool)
init(fileURLWithPath path: String) // Better to use initFileURLWithPath:isDirectory: if you know if the path is a directory vs non-directory, as it saves an i/o.
#available(iOS 2.0, *)
class func fileURLWithPath(path: String, isDirectory isDir: Bool) -> NSURL
class func fileURLWithPath(path: String) -> NSURL // Better to use fileURLWithPath:isDirectory: if you know if the path is a directory vs non-directory, as it saves an i/o.
for the line: if var template = NSString(contentsOfURL: templateURL, encoding: NSUTF8StringEncoding)?
Its decleration is:
convenience init(contentsOfURL url: NSURL, encoding enc: UInt) throws
convenience init(contentsOfFile path: String, encoding enc: UInt) throws
So it not returns optional NSString either, so you cannot use if let again. You have to use do-try-catch here.
Apple's document about this:
https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/ErrorHandling.html#//apple_ref/doc/uid/TP40014097-CH42-ID508
Also, you should use multiple unwrapping optional:
if let x = OptionalX, y = OptionalY { ... }
Your code is a pyramid of doom :)

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