AKMIDIListener: ReceivedNoteOn unable to change UI Components
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I am creating an application that receives MIDI notes and plays music in the app according to the note it received. I am using AudioKit's AKMIDIListener protocol and the function receivedMIDINoteOn. It am able to recieve these events and play the notes that I want to play from my app accordingly. However, I am also trying to change UI components within the ReceivedMIDINoteOn function, but I am unable to do so. Otherwise, the receivedMIDINoteOn is handling it's events correctly, the UI simply won't change to reflect this for some reason. The UIViewController that I am changing also has the AKMIDIListener protocol, and the receivedMIDINoteOn function is also defined in that UIViewController. I have provided a code snippet below to help ID the problem. Why might the UI components not update? In the code below, the "playButton" is not being updated when it receives the MIDINoteOn function, even though I know the function runs because it plays the background music. Also, the playButton changes it's title accordingly whenever I use change the title in some other function in my code
let midi = AudioKit.midi
class firstPageViewController: UIViewController, AKMIDIListener {
@IBOutlet var MusicButtons: [UIButton]!
@IBOutlet var playButton: UIButton!
@IBOutlet var pauseButton: UIButton!
@IBOutlet var WaveForm: AudioVisualizationView!
@IBOutlet weak var firstButton: UIButton!
@IBOutlet weak var secondButton: UIButton!
@IBOutlet weak var thirdButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
isOnFirstPage = true
isOnSecondPage = false
isOnThirdPage = false
self.secondButton.setTitleColor(UIColor.blue, for: .normal)
self.thirdButton.setTitleColor(UIColor.blue, for: .normal)
midi.openInput()
midi.addListener(self)
self.init_buttons()
self.init_soundwave()
self.init_audio()
}
func receivedMIDINoteOn(noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel) {
let currNum = mapping[Int(noteNumber)]
if currNum == 64 { //Play button
self.playBackground(0)
self.playButton.setTitle("Currently Playing", for: .normal)
}
else if currNum == 67 { //Pause button
self.pauseMusic(0)
self.playButton.setTitle("Play", for: .normal)
}
else if currNum == 68 { //Switch button - first page
self.firstPageSwitch(0)
}
else if currNum == 69 { //Switch button - second page
self.secondPageSwitch(0)
}
else if currNum == 70 { //Switch button - third page
self.thirdPageSwitch(0)
}
else if currNum == 71 {
//
}
else if currNum == 65 {
//
}
else if currNum == 66 {
//
}
else {
if isOnFirstPage! {
self.playMusic(currNum: currNum!, holder: audioPlayer)
self.MusicButtons![currNum!].backgroundColor = UIColor(red: 247/255, green: 183/255, blue: 98/255, alpha: 1.0)
}
if isOnSecondPage!{
self.playMusic(currNum: currNum!, holder: secondAudioPlayer)
self.MusicButtons![currNum!].backgroundColor = UIColor(red: 247/255, green: 183/255, blue: 98/255, alpha: 1.0)
}
}
}
}
swift xcode uiviewcontroller midi audiokit
asked Nov 10 at 21:11
AvnerKhan
132
add a comment |
up vote
2
down vote
favorite
I am creating an application that receives MIDI notes and plays music in the app according to the note it received. I am using AudioKit's AKMIDIListener protocol and the function receivedMIDINoteOn. It am able to recieve these events and play the notes that I want to play from my app accordingly. However, I am also trying to change UI components within the ReceivedMIDINoteOn function, but I am unable to do so. Otherwise, the receivedMIDINoteOn is handling it's events correctly, the UI simply won't change to reflect this for some reason. The UIViewController that I am changing also has the AKMIDIListener protocol, and the receivedMIDINoteOn function is also defined in that UIViewController. I have provided a code snippet below to help ID the problem. Why might the UI components not update? In the code below, the "playButton" is not being updated when it receives the MIDINoteOn function, even though I know the function runs because it plays the background music. Also, the playButton changes it's title accordingly whenever I use change the title in some other function in my code
let midi = AudioKit.midi
class firstPageViewController: UIViewController, AKMIDIListener {
@IBOutlet var MusicButtons: [UIButton]!
@IBOutlet var playButton: UIButton!
@IBOutlet var pauseButton: UIButton!
@IBOutlet var WaveForm: AudioVisualizationView!
@IBOutlet weak var firstButton: UIButton!
@IBOutlet weak var secondButton: UIButton!
@IBOutlet weak var thirdButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
isOnFirstPage = true
isOnSecondPage = false
isOnThirdPage = false
self.secondButton.setTitleColor(UIColor.blue, for: .normal)
self.thirdButton.setTitleColor(UIColor.blue, for: .normal)
midi.openInput()
midi.addListener(self)
self.init_buttons()
self.init_soundwave()
self.init_audio()
}
func receivedMIDINoteOn(noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel) {
let currNum = mapping[Int(noteNumber)]
if currNum == 64 { //Play button
self.playBackground(0)
self.playButton.setTitle("Currently Playing", for: .normal)
}
else if currNum == 67 { //Pause button
self.pauseMusic(0)
self.playButton.setTitle("Play", for: .normal)
}
else if currNum == 68 { //Switch button - first page
self.firstPageSwitch(0)
}
else if currNum == 69 { //Switch button - second page
self.secondPageSwitch(0)
}
else if currNum == 70 { //Switch button - third page
self.thirdPageSwitch(0)
}
else if currNum == 71 {
//
}
else if currNum == 65 {
//
}
else if currNum == 66 {
//
}
else {
if isOnFirstPage! {
self.playMusic(currNum: currNum!, holder: audioPlayer)
self.MusicButtons![currNum!].backgroundColor = UIColor(red: 247/255, green: 183/255, blue: 98/255, alpha: 1.0)
}
if isOnSecondPage!{
self.playMusic(currNum: currNum!, holder: secondAudioPlayer)
self.MusicButtons![currNum!].backgroundColor = UIColor(red: 247/255, green: 183/255, blue: 98/255, alpha: 1.0)
}
}
}
}
swift xcode uiviewcontroller midi audiokit
asked Nov 10 at 21:11
AvnerKhan
132
1
Does thereceivedMIDINoteOn()method get called on the main UI thread? There was a time when MIDI was handled entirely in interrupts (in the olden days), so it wouldn't surprise me if it's handled in a background thread. Also, you could try adding a call toself.MusicButtons![currNum!]needsDisplay = trueafter the change ofbackgroundColor.
– user1118321
Nov 10 at 21:30
add a comment |
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I am creating an application that receives MIDI notes and plays music in the app according to the note it received. I am using AudioKit's AKMIDIListener protocol and the function receivedMIDINoteOn. It am able to recieve these events and play the notes that I want to play from my app accordingly. However, I am also trying to change UI components within the ReceivedMIDINoteOn function, but I am unable to do so. Otherwise, the receivedMIDINoteOn is handling it's events correctly, the UI simply won't change to reflect this for some reason. The UIViewController that I am changing also has the AKMIDIListener protocol, and the receivedMIDINoteOn function is also defined in that UIViewController. I have provided a code snippet below to help ID the problem. Why might the UI components not update? In the code below, the "playButton" is not being updated when it receives the MIDINoteOn function, even though I know the function runs because it plays the background music. Also, the playButton changes it's title accordingly whenever I use change the title in some other function in my code
let midi = AudioKit.midi
class firstPageViewController: UIViewController, AKMIDIListener {
@IBOutlet var MusicButtons: [UIButton]!
@IBOutlet var playButton: UIButton!
@IBOutlet var pauseButton: UIButton!
@IBOutlet var WaveForm: AudioVisualizationView!
@IBOutlet weak var firstButton: UIButton!
@IBOutlet weak var secondButton: UIButton!
@IBOutlet weak var thirdButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
isOnFirstPage = true
isOnSecondPage = false
isOnThirdPage = false
self.secondButton.setTitleColor(UIColor.blue, for: .normal)
self.thirdButton.setTitleColor(UIColor.blue, for: .normal)
midi.openInput()
midi.addListener(self)
self.init_buttons()
self.init_soundwave()
self.init_audio()
}
func receivedMIDINoteOn(noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel) {
let currNum = mapping[Int(noteNumber)]
if currNum == 64 { //Play button
self.playBackground(0)
self.playButton.setTitle("Currently Playing", for: .normal)
}
else if currNum == 67 { //Pause button
self.pauseMusic(0)
self.playButton.setTitle("Play", for: .normal)
}
else if currNum == 68 { //Switch button - first page
self.firstPageSwitch(0)
}
else if currNum == 69 { //Switch button - second page
self.secondPageSwitch(0)
}
else if currNum == 70 { //Switch button - third page
self.thirdPageSwitch(0)
}
else if currNum == 71 {
//
}
else if currNum == 65 {
//
}
else if currNum == 66 {
//
}
else {
if isOnFirstPage! {
self.playMusic(currNum: currNum!, holder: audioPlayer)
self.MusicButtons![currNum!].backgroundColor = UIColor(red: 247/255, green: 183/255, blue: 98/255, alpha: 1.0)
}
if isOnSecondPage!{
self.playMusic(currNum: currNum!, holder: secondAudioPlayer)
self.MusicButtons![currNum!].backgroundColor = UIColor(red: 247/255, green: 183/255, blue: 98/255, alpha: 1.0)
}
}
}
}
swift xcode uiviewcontroller midi audiokit
asked Nov 10 at 21:11
AvnerKhan
132
I am creating an application that receives MIDI notes and plays music in the app according to the note it received. I am using AudioKit's AKMIDIListener protocol and the function receivedMIDINoteOn. It am able to recieve these events and play the notes that I want to play from my app accordingly. However, I am also trying to change UI components within the ReceivedMIDINoteOn function, but I am unable to do so. Otherwise, the receivedMIDINoteOn is handling it's events correctly, the UI simply won't change to reflect this for some reason. The UIViewController that I am changing also has the AKMIDIListener protocol, and the receivedMIDINoteOn function is also defined in that UIViewController. I have provided a code snippet below to help ID the problem. Why might the UI components not update? In the code below, the "playButton" is not being updated when it receives the MIDINoteOn function, even though I know the function runs because it plays the background music. Also, the playButton changes it's title accordingly whenever I use change the title in some other function in my code
let midi = AudioKit.midi
class firstPageViewController: UIViewController, AKMIDIListener {
@IBOutlet var MusicButtons: [UIButton]!
@IBOutlet var playButton: UIButton!
@IBOutlet var pauseButton: UIButton!
@IBOutlet var WaveForm: AudioVisualizationView!
@IBOutlet weak var firstButton: UIButton!
@IBOutlet weak var secondButton: UIButton!
@IBOutlet weak var thirdButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
isOnFirstPage = true
isOnSecondPage = false
isOnThirdPage = false
self.secondButton.setTitleColor(UIColor.blue, for: .normal)
self.thirdButton.setTitleColor(UIColor.blue, for: .normal)
midi.openInput()
midi.addListener(self)
self.init_buttons()
self.init_soundwave()
self.init_audio()
}
func receivedMIDINoteOn(noteNumber: MIDINoteNumber, velocity: MIDIVelocity, channel: MIDIChannel) {
let currNum = mapping[Int(noteNumber)]
if currNum == 64 { //Play button
self.playBackground(0)
self.playButton.setTitle("Currently Playing", for: .normal)
}
else if currNum == 67 { //Pause button
self.pauseMusic(0)
self.playButton.setTitle("Play", for: .normal)
}
else if currNum == 68 { //Switch button - first page
self.firstPageSwitch(0)
}
else if currNum == 69 { //Switch button - second page
self.secondPageSwitch(0)
}
else if currNum == 70 { //Switch button - third page
self.thirdPageSwitch(0)
}
else if currNum == 71 {
//
}
else if currNum == 65 {
//
}
else if currNum == 66 {
//
}
else {
if isOnFirstPage! {
self.playMusic(currNum: currNum!, holder: audioPlayer)
self.MusicButtons![currNum!].backgroundColor = UIColor(red: 247/255, green: 183/255, blue: 98/255, alpha: 1.0)
}
if isOnSecondPage!{
self.playMusic(currNum: currNum!, holder: secondAudioPlayer)
self.MusicButtons![currNum!].backgroundColor = UIColor(red: 247/255, green: 183/255, blue: 98/255, alpha: 1.0)
}
}
}
}
swift xcode uiviewcontroller midi audiokit
swift xcode uiviewcontroller midi audiokit
asked Nov 10 at 21:11
AvnerKhan
132
asked Nov 10 at 21:11
AvnerKhan
132
asked Nov 10 at 21:11
AvnerKhan
132
asked Nov 10 at 21:11
AvnerKhan
132
asked Nov 10 at 21:11
AvnerKhan
132
132
1
Does thereceivedMIDINoteOn()method get called on the main UI thread? There was a time when MIDI was handled entirely in interrupts (in the olden days), so it wouldn't surprise me if it's handled in a background thread. Also, you could try adding a call toself.MusicButtons![currNum!]needsDisplay = trueafter the change ofbackgroundColor.
– user1118321
Nov 10 at 21:30
add a comment |
1
Does thereceivedMIDINoteOn()method get called on the main UI thread? There was a time when MIDI was handled entirely in interrupts (in the olden days), so it wouldn't surprise me if it's handled in a background thread. Also, you could try adding a call toself.MusicButtons![currNum!]needsDisplay = trueafter the change ofbackgroundColor.
– user1118321
Nov 10 at 21:30
1
1
Does the
receivedMIDINoteOn() method get called on the main UI thread? There was a time when MIDI was handled entirely in interrupts (in the olden days), so it wouldn't surprise me if it's handled in a background thread. Also, you could try adding a call to self.MusicButtons![currNum!]needsDisplay = true after the change of backgroundColor.– user1118321
Nov 10 at 21:30
Does the
receivedMIDINoteOn() method get called on the main UI thread? There was a time when MIDI was handled entirely in interrupts (in the olden days), so it wouldn't surprise me if it's handled in a background thread. Also, you could try adding a call to self.MusicButtons![currNum!]needsDisplay = true after the change of backgroundColor.– user1118321
Nov 10 at 21:30
add a comment |
1 Answer
1
active
oldest
votes
up vote
2
down vote
accepted
The commenter is correct, you need wrap your UI calls in a
DispatchQueue.main.async {
// ... code here
}
And also perhaps will have to put an self.playButton.setNeedsDisplay() at the end.
answered Nov 10 at 22:20
Aurelius Prochazka
2,7231529
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
The commenter is correct, you need wrap your UI calls in a
DispatchQueue.main.async {
// ... code here
}
And also perhaps will have to put an self.playButton.setNeedsDisplay() at the end.
answered Nov 10 at 22:20
Aurelius Prochazka
2,7231529
add a comment |
up vote
2
down vote
accepted
The commenter is correct, you need wrap your UI calls in a
DispatchQueue.main.async {
// ... code here
}
And also perhaps will have to put an self.playButton.setNeedsDisplay() at the end.
answered Nov 10 at 22:20
Aurelius Prochazka
2,7231529
add a comment |
up vote
2
down vote
accepted
up vote
2
down vote
accepted
The commenter is correct, you need wrap your UI calls in a
DispatchQueue.main.async {
// ... code here
}
And also perhaps will have to put an self.playButton.setNeedsDisplay() at the end.
answered Nov 10 at 22:20
Aurelius Prochazka
2,7231529
The commenter is correct, you need wrap your UI calls in a
DispatchQueue.main.async {
// ... code here
}
And also perhaps will have to put an self.playButton.setNeedsDisplay() at the end.
answered Nov 10 at 22:20
Aurelius Prochazka
2,7231529
answered Nov 10 at 22:20
Aurelius Prochazka
2,7231529
answered Nov 10 at 22:20
Aurelius Prochazka
2,7231529
answered Nov 10 at 22:20
Aurelius Prochazka
2,7231529
2,7231529
add a comment |
add a comment |
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1
Does the
receivedMIDINoteOn()method get called on the main UI thread? There was a time when MIDI was handled entirely in interrupts (in the olden days), so it wouldn't surprise me if it's handled in a background thread. Also, you could try adding a call toself.MusicButtons![currNum!]needsDisplay = trueafter the change ofbackgroundColor.– user1118321
Nov 10 at 21:30