I'm trying to load some data via JSON from the web and save it globally to my app.
I have a separate swift file
struct MyAppData {
static var vendorCol = "15"
static var vendorDel = "45"
static var VendorID = "1"
}
Using alomofire i populate it.
Alamofire.request("https://domainname/data.json").responseJSON { (responseData) -> Void in
if((responseData.result.value) != nil) {
let json = JSON(responseData.result.value!)
guard let times = json["content"]["clients"].array else {
print("No Data")
return
}
for time in times {
MyAppData.vendorCol = time["col"].string!
MyAppData.vendorDel = time["del"].string!
MyAppData.VendorID = time["id"].string!
}
}
}
This works as expected if I place it on a view controller and use MyAppData.VendorID
My issue is I need a place load the data at a place where it's immediately available to all views and only want to load it once.
I tried in app delegate with no success, the function was called but the data was never updated all over the app. Some labels I set only had the default values from MyAppData.
Any help would be appreciated.
Related
There is an api (https://docs.api.jikan.moe/#section/Information). I get data from it, but I can’t display them in my collection views in any way. The data should come, I checked. I implement filling the collection view cells through the view model ViewController <-> ViewModel and with Network Manager API Manager
The result is just white collectionView - Screen
For the first time I decided to work with Alamofire and apparently I don’t understand something. Please tell me what is the problem. Link to github in case someone needs it.
Updated
The problem might be with asynchronous coding. And i still have no ideas to fix it, cause don't understand the GCD as well. Screen
func fetchRequest(typeRequest: TypeRequest) -> [AnimeModel] {
var animeModels: [AnimeModel] = []
switch typeRequest {
case .name(let name):
let urlString = "https://api.jikan.moe/v4/anime?q=\(name)"
AF.request(urlString).response { response in
guard let data = response.data else { return print("NO DATA FOR - \(name)") }
do {
let json = try JSON(data: data)
let title = json["data"][0]["title_english"].string ?? "Anime"
let imageURL = json["data"][0]["images"]["jpg"]["image_url"].string ?? ""
let image = AnimeModel.downloadImage(stringURL: imageURL)
animeModels.append(AnimeModel(image: image, title: title))
print(".NAME ANIME MODELS - \(animeModels)")
} catch let error {
print(error.localizedDescription)
}
}
}
print("BEFORE RETURN ANIME MODELS - \(animeModels)")
return animeModels // returns empty array and then "animeModel.append()" is applied
}
Good afternoon,
I have been stuck on this problem for months. I am trying to use firebase storage to save image files that a user uploaded. The program should then be able to update the queue and show the image in a horizontal table view. Kinda like netflix where its titles of movies/shows but mine would just be pictures. After trying to figure this out, this is what I came up with. Here is to receive the images
class ImageRecieve : ObservableObject {
#Published var songImageArrayURL = [URL]()
#Published var data : Data?
#Published var songImage : NSImage?
#Published var AlbumCoverArray = [NSImage]()
func GetURLS(){
//we want to get the download urls
bfRef.listAll { (result, error) in
if let error = error{ //if theres an error, print it
print(error.localizedDescription)
}
let prefixes = result.prefixes
//loop to search each song prefix
for i in prefixes.indices{
//get the song of each prefix
prefixes[i].listAll { (result, error) in
if let error = error {
print(error.localizedDescription)
}
else {
let items = result.items
//if anything contains ".mp3" dont add it to array.
for j in items.indices{
if(!items[j].name.contains("mp3")){
SongImage.append(items[j])
self.download(SongImage: items[j])
}
}
}
}
}
}
}
func download(SongImage:StorageReference){
//get download url
DispatchQueue.main.async {
SongImage.downloadURL { (url, error) in
if let error = error { //if there is an error print it
print(error.localizedDescription)
}
else {
if(url != nil){
self.songImage = NSImage(byReferencing: url!)
self.AlbumCoverArray.append(self.songImage!)
}
}
}
}
}
func load(){
if(self.songImageArrayURL.isEmpty){
GetURLS()
}
print(self.songImageArrayURL)
for i in self.songImageArrayURL.indices{
print(self.songImageArrayURL[i])
DispatchQueue.global().async{
if let data = try? Data(contentsOf: self.songImageArrayURL[i]){
if let image = NSImage(data:data){
DispatchQueue.main.async {
self.songImage = image
}
}
}
}
}
}
func cancel(){
}
}
here is to load the images :
struct LoadImages<Placeholder: View>: View {
#ObservedObject var loader : ImageRecieve
private var placeholder : Placeholder?
init(placeholder: Placeholder? = nil) {
loader = ImageRecieve()
self.placeholder = placeholder
}
var body: some View {
image
.onAppear(perform: loader.GetURLS)
.onDisappear(perform: loader.cancel)
}
private var image: some View{
ForEach(loader.AlbumCoverArray.indices,id:\.self){
i in
Group{
if(self.loader.songImage != nil){
Image(nsImage:self.loader.AlbumCoverArray[i]).resizable().frame(width:50, height:50)
}
else{
self.placeholder
}
}
}
}
}
the problem I've been stuck on is that the photos are only downloading one at a time and not listing one by one. For example, they show one image and then switch to the next. I would like an array of images. So that the images get added to the list. I've tried using an image array but it doesnt work.
photos are only downloading one at a time and not listing one by one.
in all languages an array/list is processed sequentially, you might want to use multi-Threading for parallelism. use a queue and assign few threads which download image, after each download pop the element from queue.
all the child threads append/push the data to the main thread. in that manner you will be able to display images as they load.
PS:i am != swiftie but seeing your programming i sense turmoil. try improving your code grammar and avoid too many functions and spaces.
I'm getting info from an API using the following function where I pass in a string of a word. Sometimes the word doesn't available in the API if it doesn't available I generate a new word and try that one.
The problem is because this is an asynchronous function when I launch the page where the value from the API appears it is sometimes empty because the function is still running in the background trying to generate a word that exists in the API.
How can I make sure the page launches only when the data been received from the api ?
static func wordDefin (word : String, completion: #escaping (_ def: String )->(String)) {
let wordEncoded = word.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
let uri = URL(string:"https://dictapi.lexicala.com/search?source=global&language=he&morph=false&text=" + wordEncoded! )
if let unwrappedURL = uri {
var request = URLRequest(url: unwrappedURL);request.addValue("Basic bmV0YXlhbWluOk5ldGF5YW1pbjg5Kg==", forHTTPHeaderField: "Authorization")
let dataTask = URLSession.shared.dataTask(with: request) { (data, response, error) in
do {
if let data = data {
let decoder = JSONDecoder()
let empty = try decoder.decode(Empty.self, from: data)
if (empty.results?.isEmpty)!{
print("oops looks like the word :" + word)
game.wordsList.removeAll(where: { ($0) == game.word })
game.floffWords.removeAll(where: { ($0) == game.word })
helper.newGame()
} else {
let definition = empty.results?[0].senses?[0].definition
_ = completion(definition ?? "test")
return
}
}
}
catch {
print("connection")
print(error)
}
}
dataTask.resume()
}
}
You can't stop a view controller from "launching" itself (except not to push/present/show it at all). Once you push/present/show it, its lifecycle cannot—and should not—be stopped. Therefore, it's your responsibility to load the appropriate UI for the "loading state", which may be a blank view controller with a loading spinner. You can do this however you want, including loading the full UI with .isHidden = true set for all view objects. The idea is to do as much pre-loading of the UI as possible while the database is working in the background so that when the data is ready, you can display the full UI with as little work as possible.
What I'd suggest is after you've loaded the UI in its "loading" configuration, download the data as the final step in your flow and use a completion handler to finish the task:
override func viewDidLoad() {
super.viewDidLoad()
loadData { (result) in
// load full UI
}
}
Your data method may look something like this:
private func loadData(completion: #escaping (_ result: Result) -> Void) {
...
}
EDIT
Consider creating a data manager that operates along the following lines. Because the data manager is a class (a reference type), when you pass it forward to other view controllers, they all point to the same instance of the manager. Therefore, changes that any of the view controllers make to it are seen by the other view controllers. That means when you push a new view controller and it's time to update a label, access it from the data property. And if it's not ready, wait for the data manager to notify the view controller when it is ready.
class GameDataManager {
// stores game properties
// updates game properties
// does all thing game data
var score = 0
var word: String?
}
class MainViewController: UIViewController {
let data = GameDataManager()
override func viewDidLoad() {
super.viewDidLoad()
// when you push to another view controller, point it to the data manager
let someVC = SomeOtherViewController()
someVC.data = data
}
}
class SomeOtherViewController: UIViewController {
var data: GameDataManager?
override func viewDidLoad() {
super.viewDidLoad()
if let word = data?.word {
print(word)
}
}
}
class AnyViewController: UIViewController {
var data: GameDataManager?
}
I have a view model that's fetching some data from my API, and when I get data back, I'm setting it both in Realm and on two MutableProperties on the view model
userService.getBrowseData().on(
failed: { error in
// TODO: Should call a closure the VC passes in here with an error to show
}, value: { banners, lists in
browseStoreService.store(banners: banners, lists: lists)
self.banners.value = banners
self.lists.value = lists
}
).startWithCompleted { self.dataLoaded.value = true }
In my view controller, I'm getting a crash at the line where I instantiate and set a ListViewViewModel
disposable += viewModel?.dataLoaded.producer
.observe(on: UIScheduler())
.startWithValues { loaded in
if loaded {
guard let viewModel = self.viewModel else { return }
self.carousel?.reloadData()
for list in viewModel.lists.value {
let view = ListView()
view.viewModel = ListViewViewModel(list: list)
view.listViewDelegate = self
view.listItemViewDelegate = self
scrollingStackView.addArrangedSubview(view: view)
constrain(view) { view in
view.width == view.superview!.width
view.left == view.superview!.left
view.right == view.superview!.right
}
}
}
}
The strange thing to me is that I'm just setting the data in realm, I'm not doing any additional fetch to get the data out of realm which would make sense to cause a crash, especially if the write hadn't finished.
In this case, I'm taking an array of banners and an array of lists in my response from the API, sending them into my storeService to set them in realm and assigning those same arrays to their respective MutableProperties.
Any idea what could be going here that would be causing this crash?
Edit:
The store function looks like this:
func store(banners: [Banner], lists: [List]) {
let realm = try! Realm()
do {
try realm.write {
realm.add(banners, update: true)
realm.add(lists, update: true)
}
} catch {
return
}
realm.refresh()
}
and both models have a primary key of id
Answer is below, image is here:
I was searching how to do this for a couple of days and was only able to find people who stored UILocalNotificaations in NSUserDefaults. Saving these in NSUserDefaults seemed wrong to me because it is supposed to be used for small flags. I just now finally figured out how to store notifications in CoreData. This is Using Xcode 7.3.1 and Swift 2.2
First off you need to create a new entity in your CoreDataModel
and then add a single attribute to it. the attribute should be of type Binary Data I named my table/entity "ManagedFiredNotifications" and my attribute "notification". it should look like this:
Image linked in Question above.
Next you need to add an extension to UILocalNotification it should go like this:
extension UILocalNotification {
func save() -> Bool {
let appDelegate = UIApplication.sharedApplication().delegate as? AppDelegate
let firedNotificationEntity = NSEntityDescription.insertNewObjectForEntityForName("ManagedFiredNotifications", inManagedObjectContext: appDelegate!.managedObjectContext)
guard appDelegate != nil else {
return false
}
let data = NSKeyedArchiver.archivedDataWithRootObject(self)
firedNotificationEntity.setValue(data, forKey: "notification")
do {
try appDelegate!.managedObjectContext.save()
return true
} catch {
return false
}
}
}
Now for saving a notification all you need to do is call
UILocalNotification.save()
On the notification you would like to save. my notifications were named 'notification' so I would call notification.save()
To retrieve a notification you need a method like this
func getLocalFiredNotifications() -> [UILocalNotification]? {
let managedObjectContext = (UIApplication.sharedApplication().delegate as? AppDelegate)!.managedObjectContext
let firedNotificationFetchRequest = NSFetchRequest(entityName: "ManagedFiredNotifications")
firedNotificationFetchRequest.includesPendingChanges = false
do {
let fetchedFiredNotifications = try managedObjectContext.executeFetchRequest(firedNotificationFetchRequest)
guard fetchedFiredNotifications.count > 0 else {
return nil
}
var firedNotificationsToReturn = [UILocalNotification]()
for managedFiredNotification in fetchedFiredNotifications {
let notificationData = managedFiredNotification.valueForKey("notification") as! NSData
let notificationToAdd = NSKeyedUnarchiver.unarchiveObjectWithData(notificationData) as! UILocalNotification
firedNotificationsToReturn.append(notificationToAdd)
}
return firedNotificationsToReturn
} catch {
return nil
}
}
Note that this returns an array of UILocalNotifications.
When retrieving these if you plan on removing a few of them and then storing the list again you should remove them when you get them something like this works:
func loadFiredNotifications() {
let notifications = StudyHelper().getLocalFiredNotifications()
if notifications != nil {
firedNotifications = notifications!
} else {
// throw an error or log it
}
classThatRemoveMethodIsIn().removeFiredLocalNotifications()
}
I hope this helps someone who had the same problems that I did trying to implement this.