I want to speed my code just a little bit. This is my code:
var loadedText : NSAttributedString = NSAttributedString(string: "")
let changeThemeDispatchGroup = DispatchGroup()
DispatchQueue.global(qos: .userInteractive).async {
if self.selectedNote.content != nil
{
changeThemeDispatchGroup.enter()
loadedText = self.selectedNote.content as! NSAttributedString
changeThemeDispatchGroup.leave()
}
else
{
self.noteTextView.becomeFirstResponder()
}
DispatchQueue.main.async
{
self.noteTextView.attributedText = loadedText
}
changeThemeDispatchGroup.notify(queue: DispatchQueue.main)
{
self.changeLetterColor()
}
}
I'm loading loadedText from database and I'm updating the text view. After updating the textview I'm changing the color of each letter. It works great. But now, I want to load loadedText from the database, change the text color and then update the text view. Can you help me out?
Forget the group and change the order
var loadedText = NSAttributedString(string: "")
DispatchQueue.global(qos: .userInteractive).async {
if let content = self.selectedNote.content as? NSAttributedString {
loadedText = content
} else {
self.noteTextView.becomeFirstResponder()
}
DispatchQueue.main.async {
self.changeLetterColor()
self.noteTextView.attributedText = loadedText
}
}
Related
I am making a small program using SwiftUI that allows users to create rich text "notes" in an NSTextView. I have enabled all of the formatting features from NSTextView, including the ability to work with images. The program is only for macOS and not for iOS/iPadOS.
The problem I am facing is that whenever the user types anything in the NSTextView, the caret moves to the end and all formatting and images disappear.
Since I am just using the standard formatting options provided by Apple, I have not subclassed NSTextStorage or anything like that. My use-case should be pretty simple.
The program is tiny so far and the entire source code is on GitHub (https://github.com/eiskalteschatten/ScratchPad), but I'll post the relevant code here.
This is my NSViewRepresentable class for the NSTextView:
import SwiftUI
struct RichTextEditor: NSViewRepresentable {
#EnvironmentObject var noteModel: NoteModel
func makeNSView(context: Context) -> NSScrollView {
let scrollView = NSTextView.scrollableTextView()
guard let textView = scrollView.documentView as? NSTextView else {
return scrollView
}
textView.isRichText = true
textView.allowsUndo = true
textView.allowsImageEditing = true
textView.allowsDocumentBackgroundColorChange = true
textView.allowsCharacterPickerTouchBarItem = true
textView.isAutomaticLinkDetectionEnabled = true
textView.displaysLinkToolTips = true
textView.isAutomaticDataDetectionEnabled = true
textView.isAutomaticTextReplacementEnabled = true
textView.isAutomaticDashSubstitutionEnabled = true
textView.isAutomaticSpellingCorrectionEnabled = true
textView.isAutomaticQuoteSubstitutionEnabled = true
textView.isAutomaticTextCompletionEnabled = true
textView.isContinuousSpellCheckingEnabled = true
textView.usesAdaptiveColorMappingForDarkAppearance = true
textView.usesInspectorBar = true
textView.usesRuler = true
textView.usesFindBar = true
textView.usesFontPanel = true
textView.importsGraphics = true
textView.delegate = context.coordinator
context.coordinator.textView = textView
return scrollView
}
func updateNSView(_ nsView: NSScrollView, context: Context) {
context.coordinator.textView?.textStorage?.setAttributedString(noteModel.noteContents)
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
class Coordinator: NSObject, NSTextViewDelegate {
var parent: RichTextEditor
var textView : NSTextView?
init(_ parent: RichTextEditor) {
self.parent = parent
}
func textDidChange(_ notification: Notification) {
guard let _textView = notification.object as? NSTextView else {
return
}
self.parent.noteModel.noteContents = _textView.attributedString()
}
}
}
On GitHub: https://github.com/eiskalteschatten/ScratchPad/blob/main/ScratchPad/Notes/RichTextEditor.swift
And this is my NoteModel class responsible for managing the NSTextView content:
import SwiftUI
import Combine
final class NoteModel: ObservableObject {
private var switchingPages = false
#Published var pageNumber = UserDefaults.standard.value(forKey: "pageNumber") as? Int ?? 1 {
didSet {
UserDefaults.standard.set(pageNumber, forKey: "pageNumber")
switchingPages = true
noteContents = NSAttributedString(string: "")
openNote()
switchingPages = false
}
}
#Published var noteContents = NSAttributedString(string: "") {
didSet {
if !switchingPages {
saveNote()
}
}
}
private var noteName: String {
return "\(NoteManager.NOTE_NAME_PREFIX)\(pageNumber).rtfd"
}
init() {
openNote()
}
private func openNote() {
// This is necessary, but macOS seems to recover the stale bookmark automatically, so don't handle it for now
var isStale = false
guard let bookmarkData = UserDefaults.standard.object(forKey: "storageLocationBookmarkData") as? Data,
let storageLocation = try? URL(resolvingBookmarkData: bookmarkData, options: .withSecurityScope, relativeTo: nil, bookmarkDataIsStale: &isStale)
else {
ErrorHandling.showErrorToUser("No storage location for your notes could be found!", informativeText: "Please try re-selecting your storage location in the settings.")
return
}
let fullURL = storageLocation.appendingPathComponent(noteName)
let options = [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.rtfd]
do {
guard storageLocation.startAccessingSecurityScopedResource() else {
ErrorHandling.showErrorToUser("ScratchPad is not allowed to access the storage location for your notes!", informativeText: "Please try re-selecting your storage location in the settings.")
return
}
if let _ = try? fullURL.checkResourceIsReachable() {
let attributedString = try NSAttributedString(url: fullURL, options: options, documentAttributes: nil)
noteContents = attributedString
}
fullURL.stopAccessingSecurityScopedResource()
} catch {
print(error)
ErrorHandling.showErrorToUser(error.localizedDescription)
}
}
private func saveNote() {
// This is necessary, but macOS seems to recover the stale bookmark automatically, so don't handle it for now
var isStale = false
guard let bookmarkData = UserDefaults.standard.object(forKey: "storageLocationBookmarkData") as? Data,
let storageLocation = try? URL(resolvingBookmarkData: bookmarkData, options: .withSecurityScope, relativeTo: nil, bookmarkDataIsStale: &isStale)
else {
ErrorHandling.showErrorToUser("No storage location for your notes could be found!", informativeText: "Please try re-selecting your storage location in the settings.")
return
}
let fullURL = storageLocation.appendingPathComponent(noteName)
do {
guard storageLocation.startAccessingSecurityScopedResource() else {
ErrorHandling.showErrorToUser("ScratchPad is not allowed to access the storage location for your notes!", informativeText: "Please try re-selecting your storage location in the settings.")
return
}
let rtdf = noteContents.rtfdFileWrapper(from: .init(location: 0, length: noteContents.length))
try rtdf?.write(to: fullURL, options: .atomic, originalContentsURL: nil)
fullURL.stopAccessingSecurityScopedResource()
} catch {
print(error)
ErrorHandling.showErrorToUser(error.localizedDescription)
}
}
}
On GitHub: https://github.com/eiskalteschatten/ScratchPad/blob/main/ScratchPad/Notes/NoteModel.swift
Does anyone have any idea why this is happening and/or how to fix it?
I have found these similar issues, but they don't really help me much:
Replacing NSAttributedString in NSTextStorage Moves NSTextView Cursor - I don't have any custom syntax highlighting or anything like that.
Cursor always jumps to the end of the UIViewRepresentable TextView when a newline is started before the final line + after last character on the line - Only solves the caret issue and causes jerky scroll behavior in longer documents.
Edit: I forgot to mention that I'm using macOS Ventura, but am targeting 12.0 or higher.
Edit #2: I have significantly updated the question to reflect what I've found through more debugging.
I want to avoid duplication in my core data swift. I have a sense that it should be done in-app delegate, but I am not sure what has to change.
Here is my code when I add a new Item:
#IBAction func buttonClicked(_ sender: UIBarButtonItem) {
let fetchRequest: NSFetchRequest<Bookmarks> = Bookmarks.fetchRequest()
let bookmark = Bookmarks(context: context)
if bookmarkButton.image == UIImage(systemName: "bookmark") {
bookmarkButton.image = UIImage(systemName: "bookmark.fill")
bookmark.urlToImage = urlImage
bookmark.source = sourceName
bookmark.titleName = titleName
bookmark.urlLink = url
bookmarks.append(bookmark)
} else {
bookmarkButton.image = UIImage(systemName: "bookmark")
if fetchRequest.predicate == NSPredicate.init(format: "titleName == %#", titleName!){
print(bookmark)
do {
let objects = try context.fetch(fetchRequest)
for object in objects {
context.delete(object)
}
try context.save()
} catch _ {
// error handling
}
}
}
do {
try context.save()
} catch {
}
}
Here is the photo of my application with duplication:
If you know anything about how to solve this problem help me out
Thanks in advance
Before inserting a new item check if an item with the same titleName already exists. If not insert the new item.
Something like this
#IBAction func buttonClicked(_ sender: UIBarButtonItem) {
let fetchRequest: NSFetchRequest<Bookmarks> = Bookmarks.fetchRequest()
fetchRequest.predicate = NSPredicate(format: "titleName == %#", titleName!)
if (try? context.fetch(fetchRequest))?.first != nil {
bookmarkButton.image = UIImage(systemName: "bookmark.fill")
} else {
let bookmark = Bookmarks(context: context)
bookmarkButton.image = UIImage(systemName: "bookmark")
bookmark.urlToImage = urlImage
bookmark.source = sourceName
bookmark.titleName = titleName
bookmark.urlLink = url
bookmarks.append(bookmark)
do {
try context.save()
} catch {
print(error)
}
}
}
If the item cannot be identified uniquely by the title add more conditions to the predicate.
I sent my data from my API call to my InfoController viewDidLoad. There, I was able to safely store it in a skillName constant, and also printed it, receiving all the information by console.
The problem comes when I try to assign this variable to my skillLabel.
override func viewDidLoad() {
super.viewDidLoad()
configureViewComponents()
fetchPokemons { (names) in
guard var skillName = names as? String else { return }
self.pokemon?.skillName = skillName
self.allNames = skillName
print(self.allNames)
}
}
There, when I print allNames, the console shows all the data I need. This is how the data looks like: Data Example
And the computed property where I wanna use this data looks is:
var pokemon: Pokemon? {
didSet {
guard let id = pokemon?.id else { return }
guard let data = pokemon?.image else { return }
navigationItem.title = pokemon?.name?.capitalized
infoLabel.text = pokemon?.description
infoView.pokemon = pokemon
if id == pokemon?.id {
imageView.image = UIImage(data: data)
infoView.configureLabel(label: infoView.skillLabel, title: "Skills", details: "\(allNames)")
}
}
}
PD: allNames is a String variable I have at InfoController class-level.
This is how my app looks when run:
PokeApp
My goal is to get that details param to show the skillName data, but it returns nil, idk why. Any advice?
EDIT1: My func that fetches the Pokemon data from my service class is this one:
func fetchPokemons(handler: #escaping (String) -> Void) {
controller.service.fetchPokes { (poke) in
DispatchQueue.main.async {
self.pokemon? = poke
guard let skills = poke.abilities else { return }
for skill in skills {
guard let ability = skill.ability else { return }
guard var names = ability.name!.capitalized as? String else { return }
self.pokemon?.skillName = names
handler(names)
}
}
}
}
EDIT2: InfoView class looks like:
class InfoView: UIView {
// MARK: - Properties
var delegate: InfoViewDelegate?
// This whole block assigns the attributes that will be shown at the InfoView pop-up
// It makes the positioning of every element possible
var pokemon: Pokemon? {
didSet {
guard let pokemon = self.pokemon else { return }
guard let type = pokemon.type else { return }
guard let defense = pokemon.defense else { return }
guard let attack = pokemon.attack else { return }
guard let id = pokemon.id else { return }
guard let height = pokemon.height else { return }
guard let weight = pokemon.weight else { return }
guard let data = pokemon.image else { return }
if id == pokemon.id {
imageView.image = UIImage(data: data)
}
nameLabel.text = pokemon.name?.capitalized
configureLabel(label: typeLabel, title: "Type", details: type)
configureLabel(label: pokedexIdLabel, title: "Pokedex Id", details: "\(id)")
configureLabel(label: heightLabel, title: "Height", details: "\(height)")
configureLabel(label: defenseLabel, title: "Defense", details: "\(defense)")
configureLabel(label: weightLabel, title: "Weight", details: "\(weight)")
configureLabel(label: attackLabel, title: "Base Attack", details: "\(attack)")
}
}
let skillLabel: UILabel = {
let label = UILabel()
return label
}()
let imageView: UIImageView = {
let iv = UIImageView()
iv.contentMode = .scaleAspectFill
return iv
}()
. . .
}
infoView.configureLabel is this:
func configureLabel(label: UILabel, title: String, details: String) {
let attributedText = NSMutableAttributedString(attributedString: NSAttributedString(string: "\(title): ", attributes: [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 16), NSAttributedString.Key.foregroundColor: Colors.softRed!]))
attributedText.append(NSAttributedString(string: "\(details)", attributes: [NSAttributedString.Key.font : UIFont.systemFont(ofSize: 16), NSAttributedString.Key.foregroundColor: UIColor.gray]))
label.attributedText = attributedText
}
EDIT 3: Structures design
struct Pokemon: Codable {
var results: [Species]?
var abilities: [Ability]?
var id, attack, defense: Int?
var name, type: String?
...
}
struct Ability: Codable {
let ability: Species?
}
struct Species: Codable {
let name: String?
let url: String?
}
Jump to the Edit2 paragraph for the final answer!
Initial Answer:
I looks like you UI does not get updated after the controller fetches all the data.
Since all of you UI configuration code is inside the var pokemon / didSet, it's a good idea to extract it to a separate method.
private func updateView(with pokemon: Pokemon?, details: String?) {
guard let id = pokemon?.id, let data = pokemon?.image else { return }
navigationItem.title = pokemon?.name?.capitalized
infoLabel.text = pokemon?.description
infoView.pokemon = pokemon
if id == pokemon?.id {
imageView.image = UIImage(data: data)
infoView.configureLabel(label: infoView.skillLabel, title: "Skills", details: details ?? "")
}
}
and now you can easily call in the the didSet
var pokemon: Pokemon? {
didSet { updateView(with: pokemon, details: allNames) }
}
and fetchPokemons completion aswell
override func viewDidLoad() {
super.viewDidLoad()
configureViewComponents()
fetchPokemons { (names) in
guard var skillName = names as? String else { return }
self.pokemon?.skillName = skillName
self.allNames = skillName
print(self.allNames)
DispatchQueue.main.async {
self.updateView(with: self.pokemon, details: self.allNames)
}
}
}
It's super important to do any UI setup on the main queue.
Edit:
The fetch function may be causing the problems! you are calling handler multiple times:
func fetchPokemons(handler: #escaping (String) -> Void) {
controller.service.fetchPokes { (poke) in
DispatchQueue.main.async {
self.pokemon? = poke
guard let skills = poke.abilities else { return }
let names = skills.compactMap { $0.ability?.name?.capitalized }.joined(separator: ", ")
handler(names)
}
}
}
Edit2:
After looking at your codebase there are a couple of things you need to change:
1. fetchPokemons implementation
the handler of controller.service.fetchPokes gets called for every pokemon so we need to check if the fetched one is the current (self.pokemon) and then call the handler with properly formated skills.
func fetchPokemons(handler: #escaping (String) -> Void) {
controller.service.fetchPokes { (poke) in
guard poke.id == self.pokemon?.id else { return }
self.pokemon? = poke
let names = poke.abilities?.compactMap { $0.ability?.name?.capitalized }.joined(separator: ", ")
handler(names ?? "-")
}
}
2. update viewDidLoad()
now simply pass the names value to the label.
override func viewDidLoad() {
super.viewDidLoad()
configureViewComponents()
fetchPokemons { (names) in
self.pokemon?.skillName = names
self.infoView.configureLabel(label: self.infoView.skillLabel, title: "Skills", details: names)
}
}
3. Refactor var pokemon: Pokemon? didSet observer
var pokemon: Pokemon? {
didSet {
guard let pokemon = pokemon, let data = pokemon.image else { return }
navigationItem.title = pokemon.name?.capitalized
infoLabel.text = pokemon.description!
infoView.pokemon = pokemon
imageView.image = UIImage(data: data)
}
}
I am working on an app that will retrieve posts from WordPress and allow the user to view each post individually, in detail. The WordPress API brings back the post content which is the HTML of the post. (Note: the img tags are referencing the WordPress URL of the uploaded image)
Originally, I was using a WebView & loading the retrieved content directly into it. This worked great; however, the images seemed to be loading on the main thread, as it caused lag & would sometimes freeze the UI until the image had completed downloading. I was suggested to check out the Aztec Editor library from WordPress; however, I could not understand how to use it (could not find much documentation).
My current route is parsing the HTML content and creating a list of dictionaries (keys of type [image or text] and content). Once it is parsed, I build out the post by dynamically adding Labels & Image views (which allows me to download images in background). While this does seem overly-complex & probably the wrong route, it is working well (would be open to any other solutions, though!) My only issue currently is the delay of converting an HTML string to NSAttributedText. Before adding the text content to the dictionary, I will convert it from a String to an NSAttributedString. I have noticed a few seconds delay & the CPU of the simulator getting up to 50-60% for a few seconds, then dropping. Is there anyway I could do this conversion on a background thread(s) and display a loading animation during this time?
Please let me know if you have any ideas or suggestions for a better solution. Thank you very much!
Code:
let postCache = NSCache<NSString, AnyObject>()
var yPos = CGFloat(20)
let screenWidth = UIScreen.main.bounds.width
...
func parsePost() -> [[String:Any]]? {
if let postFromCache = postCache.object(forKey: postToView.id as NSString) as? [[String:Any]] {
return postFromCache
} else {
var content = [[String:Any]]()
do {
let doc: Document = try SwiftSoup.parse(postToView.postContent)
if let elements = try doc.body()?.children() {
for elem in elements {
if(elem.hasText()) {
do {
let html = try elem.html()
if let validHtmlString = html.htmlToAttributedString {
content.append(["text" : validHtmlString])
}
}
} else {
let imageElements = try elem.getElementsByTag("img")
if(imageElements.size() > 0) {
for image in imageElements {
var imageDictionary = [String:Any]()
let width = (image.getAttributes()?.get(key: "width"))!
let height = (image.getAttributes()?.get(key: "height"))!
let ratio = CGFloat(Float(height)!/Float(width)!)
imageDictionary["ratio"] = ratio
imageDictionary["image"] = (image.getAttributes()?.get(key: "src"))!
content.append(imageDictionary)
}
}
}
}
}
} catch {
print("error")
}
if(content.count > 0) {
postCache.setObject(content as AnyObject, forKey: postToView.id as NSString)
}
return content
}
}
func buildUi(content: [[String:Any]]) {
for dict in content {
if let attributedText = dict["text"] as? NSAttributedString {
let labelToAdd = UILabel()
labelToAdd.attributedText = attributedText
labelToAdd.numberOfLines = 0
labelToAdd.frame = CGRect(x:0, y:yPos, width: 200, height: 0)
labelToAdd.sizeToFit()
yPos += labelToAdd.frame.height + 5
self.scrollView.addSubview(labelToAdd)
} else if let imageName = dict["image"] as? String {
let ratio = dict["ratio"] as! CGFloat
let imageToAdd = UIImageView()
let url = URL(string: imageName)
Nuke.loadImage(with: url!, into: imageToAdd)
imageToAdd.frame = CGRect(x:0, y:yPos, width: screenWidth, height: screenWidth*ratio)
yPos += imageToAdd.frame.height + 5
self.scrollView.addSubview(imageToAdd)
}
}
self.scrollView.contentSize = CGSize(width: self.scrollView.contentSize.width, height: yPos)
}
extension String {
var htmlToAttributedString: NSAttributedString? {
guard let data = data(using: .utf8) else { return NSAttributedString() }
do {
return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
} catch {
return NSAttributedString()
}
}
var htmlToString: String {
return htmlToAttributedString?.string ?? ""
}
}
( Forgive me for the not-so-clean code! I am just wanting to make sure I can achieve a desirable outcome before I start refactoring. Thanks again! )
I am trying to currently display the album artwork for a locally stored .MP3 track in an ImageView. Does anyone know how to fetch this artwork in Swift in order to accomplish this?
I have found this solution (iOS AVFoundation: How do I fetch artwork from an mp3 file?) but the code is written in Objective C. I simply want to grab the image embedded in my MP3 and display it in my ImageView.
I've looked at the API documentation for the MPMediaItemArtwork and found an example that also accomplishes what I am trying to accomplish in Objective C as well here(http://www.codeitive.com/0zHjkUjUWX/not-able-to-get-the-uiimage-from-mpmediaitempropertyartwork.html) but cannot come up with a solution. My code is as follows:
import UIKit
import AVFoundation
import MediaPlayer
class ViewController: UIViewController {
let audioPath:NSURL! = NSBundle.mainBundle().URLForResource("SippinOnFire", withExtension: "mp3")
#IBOutlet var artistImage: UIImageView!
#IBOutlet var trackLabel: UILabel!
#IBOutlet var artistLabel: UILabel!
#IBOutlet var sliderValue: UISlider!
var player:AVAudioPlayer = AVAudioPlayer()
#IBAction func play(sender: AnyObject) {
let audioInfo = MPNowPlayingInfoCenter.defaultCenter()
println(audioInfo)
player.play()
//println("Playing \(audioPath)")
let playerItem = AVPlayerItem(URL: audioPath)
let metadataList = playerItem.asset.metadata as! [AVMetadataItem]
for item in metadataList {
if let stringValue = item.value {
println(item.commonKey)
if item.commonKey == "title" {
trackLabel.text = stringValue as? String
}
if item.commonKey == "artist" {
artistLabel.text = stringValue as? String
}
if item.commonKey == "artwork" {
if let audioImage = UIImage(data: item.value as! NSData) {
let audioArtwork = MPMediaItemArtwork(image: audioImage)
println(audioImage.description)
}
}
}
}
}
#IBAction func pause(sender: AnyObject) {
player.pause()
}
#IBAction func stop(sender: AnyObject) {
player.stop()
player.currentTime = 0;
}
#IBAction func sliderChanged(sender: AnyObject) {
player.volume = sliderValue.value
}
override func viewDidLoad() {
super.viewDidLoad()
var error:NSError? = nil
player = AVAudioPlayer(contentsOfURL: audioPath!, error: &error)
player.volume = 0.5;
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Here is a screen shot of my sample .mp3 file. As you can see there is indeed album artwork that is both visible in the "get info" section of Finder. I've also opened the .mp3 in my iTunes to make sure and have confirmed there is artwork in the "get info" section of it there as well as under the "artwork" tab.
However, when trying to use the commonKey to assign the image to my imageView I find that there is no commonKey for "artwork".
Thanks
Change your snippet of code into this (I already tested it):
I added println lines commented in places of interest, Feel free to uncomment in order to see what is happening.
for item in metadataList {
if item.commonKey == nil{
continue
}
if let key = item.commonKey, let value = item.value {
//println(key)
//println(value)
if key == "title" {
trackLabel.text = value as? String
}
if key == "artist" {
artistLabel.text = value as? String
}
if key == "artwork" {
if let audioImage = UIImage(data: value as! NSData) {
//println(audioImage.description)
artistImage.image = audioImage
}
}
}
}
UPDATE: A bit of clean up of this code
for item in metadataList {
guard let key = item.commonKey, let value = item.value else{
continue
}
switch key {
case "title" : trackLabel.text = value as? String
case "artist": artistLabel.text = value as? String
case "artwork" where value is NSData : artistImage.image = UIImage(data: value as! NSData)
default:
continue
}
}
UPDATE: For Swift 4
for item in metadataList {
guard let key = item.commonKey?.rawValue, let value = item.value else{
continue
}
switch key {
case "title" : trackLabel.text = value as? String
case "artist": artistLabel.text = value as? String
case "artwork" where value is Data : artistImage.image = UIImage(data: value as! Data)
default:
continue
}
}
edit/update Swift 4 or later:
import MediaPlayer
var nowPlayingInfo: [String: Any] = [:]
let playerItem = AVPlayerItem(url: url)
let metadataList = playerItem.asset.metadata
for item in metadataList {
switch item.commonKey {
case .commonKeyTitle?:
nowPlayingInfo[MPMediaItemPropertyTitle] = item.stringValue ?? ""
case .commonKeyType?:
nowPlayingInfo[MPMediaItemPropertyGenre] = item.stringValue ?? ""
case .commonKeyAlbumName?:
nowPlayingInfo[MPMediaItemPropertyAlbumTitle] = item.stringValue ?? ""
case .commonKeyArtist?:
nowPlayingInfo[MPMediaItemPropertyArtist] = item.stringValue ?? ""
case .commonKeyArtwork?:
if let data = item.dataValue,
let image = UIImage(data: data) {
nowPlayingInfo[MPMediaItemPropertyArtwork] = MPMediaItemArtwork(boundsSize: image.size) { _ in image }
}
case .none: break
default: break
}
}
let audioInfo = MPNowPlayingInfoCenter.default()
audioInfo.nowPlayingInfo = nowPlayingInfo
Note: You will have to invoke beginReceivingRemoteControlEvents() otherwise it will not work on the actual device. You will also need to set your app Background Modes (Audio and AirPlay) and set your AVAudioSession category to AVAudioSessionCategoryPlayback and set it active:
do {
try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [.mixWithOthers, .allowAirPlay])
print("Playback OK")
try AVAudioSession.sharedInstance().setActive(true)
print("Session is Active")
} catch {
print(error)
}
Try this:
It appears that sometimes iOS 8 returns nil at first attempt of obtaining this info:
if let audioCenter = MPNowPlayingInfoCenter.defaultCenter(){
if let audioInfo = audioCenter.nowPlayingInfo{
if let artwork = audioInfo[MPMediaItemPropertyArtwork] as? MPMediaItemArtwork
{
var image: UIImage? = artwork.imageWithSize(artwork.bounds.size)
if image == nil {
image = artwork.imageWithSize(artwork.bounds.size);
}
if image != nil{
println("image loaded")
}
}
}
}