I've been battling this one all day, as you can see I'm new to Swift.
I'm trying to update a UITextField in a iOS Action Extension. Correct value logs below, and outside of the loadItem() the correct value can be set.
Weak variable in the outlet? Some sort of closure thing? Function fires asynchronously and I'm not allowed to update the UI this way once it finishes?
Thank you in advance!
class ActionViewController: UIViewController {
//outlets
#IBOutlet weak var bookmarkTitle: UITextField!
//vars
var pageTitle = ""
override func viewDidLoad() {
super.viewDidLoad()
if let inputItem = extensionContext!.inputItems.first as? NSExtensionItem {
if let itemProvider = inputItem.attachments?.first as? NSItemProvider {
itemProvider.loadItem(forTypeIdentifier: kUTTypePropertyList as String) { [unowned self] (dict, error) in
// do stuff!
let itemDictionary = dict as! NSDictionary
let javaScriptValues = itemDictionary[NSExtensionJavaScriptPreprocessingResultsKey] as! NSDictionary
print(javaScriptValues)
//this works, gets correct data. how to assign to IBOutlet?
self.pageTitle = javaScriptValues["title"] as! String
NSLog("Title From JS Preprocessor: " + self.pageTitle)
/*===================================*/
//Reference to property 'bookmarkTitle' in closure requires explicit 'self.' to make capture semantics explicit
//bookmarkTitle.text = self.pageTitle
//when the line below is used, the action extension fails to even open
self.bookmarkTitle.text = self.pageTitle
/*===================================*/
}
}
}
}
}
try to change the textfield text in Main Queue like this:
DispatchQueue.main.async {
// work that impacts the user interface
self.bookmarkTitle.text = self.pageTitle
}
Related
I have a data model which I made for API returns, it is something like this:
struct VehicleData: Codable {
let _embedded: Embedded
}
struct Embedded: Codable {
let userVehicles: [UserVehicles]
}
struct UserVehicles: Codable {
let id: String
let images: [String]
let userId: String
let vehicle: Vehicle
let originalPrice: OriginalPrice
let hasBasicInsurance: Bool
}
I have used callback function to pass it to my ViewController, now I want to get check in the useVehiclers list, how many vehicles hasBasicInsurance. basically, vehicleList?._embedded.userVehicles[i] = true
this is my function code to use the vehicle data in ViewController:
var vehicleManager = VehicleManager()
var vehicleList: VehicleData?
var i: Int = 0
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
vehicleManager.retrieveUserVehicle()
vehicleManager.onDataUpdate = { [weak self] (data: VehicleData) in
self?.useData(data: data)
}
tableView.dataSource = self
tableView.delegate = self
tableView.tableFooterView = UIView() //remove empty tableView cells
tableView.register(UINib(nibName: Constants.vehicleListCellNibName, bundle: nil), forCellReuseIdentifier: Constants.vehicleListToBeInsuredIdentifier)
}
func useData(data: VehicleData) {
vehicleList = data
// code below has issues....
for i in [vehicleList?._embedded.userVehicles] {
if let vechile = vehicleList?._embedded.userVehicles[i].hasBasicInsurance {
if vehicle == true {
i = i + 1
print(">>number of of insured vehidle: \(i)")
} else {
print(">>>number of of insured vehidle: \(i)")
}
}
}
}
Do you know how to fix it?
You need to supply a default value for optional as a good practise instead of force unwrap
for i in vehicleList?._embedded.userVehicles ?? [] { }
It's not clear from your code, but it looks like vehicleList is optional. It probably should not be (see Leo Dabus's comments). It is rare that it makes sense to have an optional array. That suggests there's some difference between an empty array and a missing array. If there is, then that's fine, but in most cases you should just use a non-optional array and make it empty.
Whether you fix that or not, the solution to this particular problem is to just use a non-optional value, and you have one: data. So change the loop to:
for i in data._embedded.userVehicles { ... }
From your updated question, you note "I want to get check in the useVehiclers list, how many vehicles hasBasicInsurance." It seems you want to put that value in i. If so, that would be:
func useData(data: VehicleData) {
vehicleList = data
i = data._embedded.userVehicles
.filter(\.hasBasicInsurance)
.count
}
You can also use for_each loop for this, for eg like this:
vehicleList?._embedded.userVehicles.for_each(x in /*Do your thing here*/)
I am using some values to perform some calculations. For testing purposes I show in Label1 a value as string, since it is stored as a string and in Label2 I show a casted value as a Double since I need them at the end as doubles for my calculations.
The weird thing is, that when I access the ViewController the first time it doesn't show any values. But if I go back and klick on it again using the navigation controller it actually works. But I need the values right away cause my original intention is as I said, not showing some labels but rather making some calculations with it.
I made a little gif to show you what the problem is but I have problem with adding photos. Basically what happens is, that I click on the ViewController with the labels and nothing is showed. I go back and press again and the values will be showed in the labels.
Why is that and how can it be showed right away/ used for calculations right away
Thanks for the help. :)
class AHPfinalPreferencesViewController: UIViewController {
var ahpPrios = [AHPPriorityStruct]()
let decoder = JSONDecoder()
#IBOutlet weak var label1: UILabel!
#IBOutlet weak var label2: UILabel!
let ajkpXc = globaLajkpXc
let ajkpXijr = globaLajkpXijr
let valueA = globaLajkpXc
let valueB = Double(globaLajkpXijr)
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
UserService.ahpPref(for: User.current) { (ahpPrios) in
self.ahpPrios = ahpPrios
print("This is our AHP PRIOS", ahpPrios)
for ahpPrio in ahpPrios {
print(ahpPrio)
}
print("this is the global ajk. ", self.ajkpXc)
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Mark: - Get Data
label1.text = valueA
label2.text = "\(String(describing: valueB))"
// MARK: - Set Values for calculation
// setValues()
// ahpCalculation()
}
}
Could it be because of the globalVariables? I know that it is not the right way to do it but for my purposes its absolutely "okay"
import Foundation
import FirebaseAuth.FIRUser
import FirebaseDatabase
import FirebaseUI
import FirebaseAuth
import CodableFirebase
var globaLajkpXc: String = String()
var globaLajkpXijr: String = String()
var globaLajkpXqpa: String = String()
struct UserService {
static func ahpPref(for user: User, completion: #escaping ([AHPPriorityStruct]) -> Void) {
let ref = Database.database().reference().child("AHPRatings").child(user.uid)
ref.observe(DataEventType.value, with: { snapshot in
guard let value = snapshot.value else { return }
do {
let ahpPrios = try FirebaseDecoder().decode(AHPPriorityStruct.self, from: value)
print(ahpPrios)
// MARK: - lets store the values in the actual constants :)
let ajkpXc = ahpPrios.ajkpXc
let ajkpXijr = ahpPrios.ajkpXijr
let ajkpXqpa = ahpPrios.ajkpXqpa
globaLajkpXc = ajkpXc ?? "no Value"
globaLajkpXijr = ajkpXijr ?? "no Value"
globaLajkpXqpa = ajkpXqpa ?? "no Value"
} catch let error {
print(error)
}
})
}
}
[1]: https://i.stack.imgur.com/VKxaE.png
You are calling UserService's ahpPref in your controller's viewWillAppear. BUT you are attempting to put your valueA (globaLajkpXc's value) to your label in your controller's viewDidLoad.
So what does that mean? Do you know which of these two controller's life cycle method gets called and when they do get called?
To solve your problem, have your label assigning value code
label1.text = globaLajkpXc
move in the completion block of your ahpPref (in the viewWillAppear).
Here's the Apple's documentation about the UIViewController's lifecycle: https://developer.apple.com/library/archive/referencelibrary/GettingStarted/DevelopiOSAppsSwift/WorkWithViewControllers.html
Also, below this line: globaLajkpXqpa = ajkpXqpa ?? "no Value"
add your completion call, like:
completion([ahpPrios]).
This should make my answer above work.
I am trying to retrieve certain data from my Firebase Database - the profile image. As you can see, this is from a UITableViewCell. I have an #IBOutlet for my imageView I want to cover.
As the view awakens, you can see that I go through, and make sure that I can get the information. I know how to retrieve data from Firebase, but not photo URLs, and then convert to the photo itself.
I'm not sure why it isn't working. I am getting an error, and will show it below. There is a possibility it is because of the URL unwrapping stuff, or as if the Firebase isn't formatted correctly, which I think it is, though.
Error Message : Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
import UIKit
import FirebaseAuth
import FirebaseDatabase
import Firebase
class ProfileCellControler: UITableViewCell {
#IBOutlet var name : UILabel!
#IBOutlet var rating : UILabel!
#IBOutlet var imageViewPro : UIImageView!
var databaseRefer : DatabaseReference!
var databaseHandle : DatabaseHandle!
override func awakeFromNib() {
super.awakeFromNib()
var urlString = ""
let urll = URL(string: urlString)!
databaseRefer = Database.database().reference()
let userID = Auth.auth().currentUser!.uid
databaseHandle = databaseRefer.child("Users").child(userID).child("Profile").child("Profile Name").observe(.value, with: { (data) in
print(String((data.value as? String)!))
self.name.text = "\(String((data.value as? String)!))"
print("Done")
})
databaseHandle = databaseRefer.child("Users").child(userID).child("Profile").child("Stars").observe(.value, with: { (data) in
print(String((data.value as? String)!))
if ((String((data.value as? String)!)) == "N/A") {
self.rating.text = "No Rating"
} else {
self.rating.text = "\(String((data.value as? String)!)) ★"
}
print("Done")
})
databaseHandle = databaseRefer.child("Users").child(userID).child("Profile").child("Profile Image").observe(.value, with: { (data) in
print(String((data.value as? String)!))
print("Done \(String((data.value as? String)!))")
urlString = (String((data.value as? String)!))
})
ImageService.downloadImage(withURL: urll) { (image) in
self.imageViewPro.image = image
}
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
The string for the URL is found nil because you are creating the call to download the image for your url before the urll has been initialized with a value from the database in:
databaseHandle = databaseRefer.child("Users").child(userID).child("Profile").child("Profile Image").observe(.value, with: { (data) in
print(String((data.value as? String)!))
print("Done \(String((data.value as? String)!))")
urlString = (String((data.value as? String)!))
})
observe(.value, with: ) Is an asynchronous operation thus
ImageService.downloadImage(withURL: urll) { (image) in
self.imageViewPro.image = image
}
Is being called before observe(.value, with:) is resolved. I would recommend moving the callback for the download URL inside of the completion for .observe(:value, :with) or using grand central dispatch to control the flow better.
As a side note, I highly recommend SDWebImage for handling your image downloading needs as it is configurable with a default image for situations such as this when the image fails to load.
Import KingFisher to make your life easier and then..
Download string representation of image from Firebase asynchronically.
Assign downloaded image to imageView with .kf.setImage method.
I want to implement an imessage app, however being new to the messages framework and iMessage apps being such a new thing there aren't many resources. So I am following the WWDC video and using Apples providing sample app for a guide.
I have three views, the MessageViewController which handles pretty much all the functionality and then a CreateViewController and a DetailsViewController.
I am simply trying to create an MSMessage from the CreateViewController and display in the DetailsViewController.. then add to the data.
However I get a crash when trying to create the data.
#IBAction func createAction(_ sender: AnyObject) {
//present full screen for create list
self.delegate?.createViewControllerDidSelectAdd(self as! CreateViewControllerDelegate)
}
The data type I am trying to pass is the dictionary from a struct:
struct data {
var title: String!
var date: Date!
var dictionary = ["title" : String(), "Array1" : [String](), "Array2" : [String]() ] as [String : Any]
}
So here's how things are set up;
MessagesViewController
class MessagesViewController: MSMessagesAppViewController, {
// MARK: Responsible for create list button
func composeMessage(for data: dataItem) {
let messageCaption = NSLocalizedString("Let's make", comment: "")
let dictionary = data.dictionary
func queryItems(dictionary: [String:String]) -> [URLQueryItem] {
return dictionary.map {
URLQueryItem(name: $0, value: $1)
}
}
var components = URLComponents()
components.queryItems = queryItems(dictionary: dictionary as! [String : String])
let layout = MSMessageTemplateLayout()
layout.image = UIImage(named: "messages-layout-1.png")!
layout.caption = messageCaption
let message = MSMessage()
message.url = components.url!
message.layout = layout
message.accessibilityLabel = messageCaption
guard let conversation = activeConversation else { fatalError("Expected Convo") }
conversation.insert(message) { error in
if let error = error {
print(error)
}
}
}
}
extension MessagesViewController: CreateViewControllerDelegate {
func createViewControllerDidSelectAdd(_ controller: CreateViewControllerDelegate) {
//CreatesNewDataItem
composeMessage(for: dataItem())
}
}
CreateViewController
/**
A delegate protocol for the `CreateViewController` class.
*/
protocol CreateViewControllerDelegate : class {
func createViewControllerDidSelectAdd(_ controller: CreateViewControllerDelegate)
}
class CreateViewController: UIViewController {
static let storyboardIdentifier = "CreateViewController"
weak var delegate: CreateViewControllerDelegate?
#IBAction func create(_ sender: AnyObject) {
//present full screen for create list
self.delegate?.createViewControllerDidSelectAdd(self as! CreateListViewControllerDelegate)
}
}
Would someone show where I am going wrong and how I can send a MSMessage? If I am able to send the message I should then be able to receive and resend.
One issue I see, without being able to debug this myself:
you are setting your components.queryItems to your dictionary var cast as [String:String], but the dictionary returned from data.dictionary is not a [String:String], but a [String:Any]
In particular, dictionary["Array1"] is an array of Strings, not a single string. Same for dictionary["Array2"]. URLQueryItem expects to be given two strings in its init(), but you're trying to put a string and an array of strings in (though I'm not sure that you're actually getting to that line in your queryItems(dictionary:) method.
Of course, your dataItem.dictionary is returning a dictionary with 4 empty values. I'm not sure that's what you want.
I have my file myAPI.swift, and two objet Round and GameStats. My Round object also have an attribute GameStats. So what I want to do is to get the GameStats property that I store inside my users defaults then assign it inside my Round object.
class myAPI: NSObject {
static let sharedInstance = myAPI()
var currentStats: GameStats?
var currentRound: Round?
private init(){
super.init()
self.loadData()
NSLog("Stats have been reload: \(self.currentRound?.gameStats)") // Return nil
// If I try to add this line the app stop running and nothing happens
NSLog("Test Singleton: \(myApp.sharedInstance.currentRound?.gameStats)")
}
func loadData(){
let backupNSData = NSUserDefaults.standardUserDefaults().objectForKey("backupNSData")
if let backupNSData = backupNSData as? NSData{
let backupData = NSKeyedUnarchiver.unarchiveObjectWithData(backupNSData)
if let backupData = backupData as? [String:AnyObject] {
guard let round = backupData["currentRound"] as? Round else {
print("error round loaddata")
return
}
self.currentRound = round
guard let stats = backupData["stats"] as? GameStats else {
print("error guard stats")
return
}
self.currentRound.gameStats = stats
NSLog("Stats reloaded: \(stats)") // This is not nil it works here
}
}
}
When my app crash I call this function to save the data
func backupData(){
var backupData:[String:AnyObject] = [String:AnyObject]()
if let round = self.currentRound {
backupData["currentRound"] = round
ColorLog.purple("Stats saved inside Round \(round.gameStats)")
}
if let stats = self.currentStat {
backupData["stats"] = stats
ColorLog.purple("Stats saved : \(stats)")
}
let backupNSData = NSKeyedArchiver.archivedDataWithRootObject(backupData)
NSUserDefaults.standardUserDefaults().setObject(backupNSData, forKey: "backupNSData")
NSUserDefaults.standardUserDefaults().synchronize()
}
So I have two question,
Is it normal that I can't call my singleton like myApp.sharedInstance.currentRound.id = 5 (for instance) inside the init() (I guess it is but I didn't find anything about that)
Why in my init() method my first NSLog self.currentRound?.gameStats is nil when in the function loadData() it wasn't ? It seems like it's losing its reference since we are leaving the function.
What am I doing right now is adding a currentStats property in my singleton, then when I retrieve data instead of doing self.currentRound.gameStats = stats I do self.currentStats = stats, then self.currentRoud.gameStats = self.currentStats and If I do that it works, I don't really know If I am doing the things right here.
Also my two objects Round and GameStats conform to NSCoding protocol as I implemented #objc func encodeWithCoder and #objc required init?(coder aDecoder: NSCoder) methods for both of them.
Thank for you help.