In my parent view controller I have this:
- (BOOL)canBecomeFirstResponder
{
return YES;
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSLog(#"BECOMING FIRST RESPONDER");
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (void) viewWillDisappear:(BOOL)animated {
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
[super viewWillDisappear:animated];
}
In any child view controller that I want to handle remote control events I do this:
- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {
if (receivedEvent.type == UIEventTypeRemoteControl) {
switch (receivedEvent.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
{
//do something
break;
}
default:
break;
}
}
}
The problem is that the events are received in one of the child classes but not the other, even though they are very similar. They are presented the same way. Neither of them override viewDidAppear so they should both become first responder when they appear and receive remote control events.
So my question is, what could be making the one view controller lose first responder status?
EDIT:
Some debugging logs show that the view controller actually is the first responder. But for some reason it's not receiving the events.
Try the following:
[self resignFirstResponder];
Related
As I understand, in order to show music player on lock screen, writing the following code is not enough.
override func viewDidAppear(animated: Bool) {
var mpic = MPNowPlayingInfoCenter.defaultCenter()
mpic.nowPlayingInfo = [
MPMediaItemPropertyTitle:"This Is a Test",
MPMediaItemPropertyArtist:"Matt Neuburg"
]
}
My app also should be able to receive remote control events
So, how to do that in Swift?
I found this from Apple Documentation, but it's for Objective-C.
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// Turn on remote control event delivery
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
// Set itself as the first responder
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated {
// Turn off remote control event delivery
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
// Resign as first responder
[self resignFirstResponder];
[super viewWillDisappear:animated];
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent {
if (receivedEvent.type == UIEventTypeRemoteControl) {
switch (receivedEvent.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
[self playOrStop: nil];
break;
case UIEventSubtypeRemoteControlPreviousTrack:
[self previousTrack: nil];
break;
case UIEventSubtypeRemoteControlNextTrack:
[self nextTrack: nil];
break;
default:
break;
}
}
}
Just found solution on GitHub
https://github.com/mattneub/Programming-iOS-Book-Examples/tree/master/bk2ch14p643ducking/ch27p912ducking
I have realized representation of my AVPlayer on iPhone lock screen via MPNowPlayingInfoCenter. But I can't found how to add ±15 seconds rewind buttons like in standard Music app.
So the question is How to add this buttons on lock screen?
I'm using AVAudioPlayer at the moment, but the remote controlling method which is - (void)remoteControlReceivedWithEvent:(UIEvent *)event must not be involved with the type of the player you're using.
Follow this:
In your view controller's viewDidLoad method add the following code:
//Make sure the system follows our playback status - to support the playback when the app enters the background mode.
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
Then add these methods:
viewDidAppear:: (if not implemented already)
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
//Once the view has loaded then we can register to begin recieving controls and we can become the first responder
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
viewWillDisappear: (if not implemented already)
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
//End recieving events
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
}
And:
//Make sure we can recieve remote control events
- (BOOL)canBecomeFirstResponder {
return YES;
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
//if it is a remote control event handle it correctly
if (event.type == UIEventTypeRemoteControl)
{
if (event.subtype == UIEventSubtypeRemoteControlPlay)
{
[self playAudio];
}
else if (event.subtype == UIEventSubtypeRemoteControlPause)
{
[self pauseAudio];
}
else if (event.subtype == UIEventSubtypeRemoteControlTogglePlayPause)
{
[self togglePlayPause];
}
else if (event.subtype == UIEventSubtypeRemoteControlBeginSeekingBackward)
{
[self rewindTheAudio]; //You must implement 15" rewinding in this method.
}
else if (event.subtype == UIEventSubtypeRemoteControlBeginSeekingForward)
{
[self fastForwardTheAudio]; //You must implement 15" fast-forwarding in this method.
}
}
}
This is working fine in my app, however if you want to be able to receive remote control events in all view controllers, then you should set it in the AppDelegate.
after I managed to play audio in background with MPMoviePlayerController and tried to make it receive remote controls. But when I click on the Play/Pause button there's no reaction and the audio keeps on playing.
Then I tried to show if there's a log-output but there's no output.
Here's my Code:
-(void)viewDidAppear:(BOOL)animated{
...
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
NSLog(#"remoteControlReceivedWithEvent: %#", event);
if (event.type==UIEventTypeRemoteControl) {
if (event.subtype==UIEventSubtypeRemoteControlPlay) {
NSLog(#"Play");
} else if (event.subtype==UIEventSubtypeRemoteControlPause) {
NSLog(#"Pause");
} else if (event.subtype==UIEventSubtypeRemoteControlTogglePlayPause) {
NSLog(#"Play Pause");
}
}
}
Thanks for your effort in advanced.
It looks like your view controller isn't in the responder chain.
That might be due to [self resignFirstResponder] in viewWillDisappear and/or another ViewController is in the front.
To make sure you receive these events you can implement a UIApplication subclass which will be able to receive the events always. So it doesn't matter which ViewController is visible.
The UIApplication is always in the end of the responder chain.
Create a subclass for UIApplication (MyUIApplication) and implements the following UIResponder methods:
- (void)remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {
...
}
- (BOOL)canBecomeFirstResponder {
return YES;
}
In main.m use the following to initiate the app (replace MyUIApplication and AppDelegate with your classes names):
#autoreleasepool {
return UIApplicationMain(argc, argv, NSStringFromClass([MyUIApplication class]), NSStringFromClass([AppDelegate class]));
}
So let me clarify first off with showing what code i have implemented
-(BOOL)canBecomeFirstResponder
{
return YES;
}
- (void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self becomeFirstResponder];
}
- (void) viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated
{
[self resignFirstResponder];
[super viewWillDisappear:animated];
}
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if (motion == UIEventSubtypeMotionShake)
{
NSLog(#"FUUU");
}
}
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if (motion == UIEventSubtypeMotionShake)
{
NSLog(#"FUUU");
}
}
this is all in a UIViewController class
and in - (void) applicationDidFinishLaunching:(UIApplication*)application i have set
[application setApplicationSupportsShakeToEdit:YES];
Yet it does nothing, not nary single motion detected. I'm not sure what else to do. This seems to have worked for many other people, so i am baffled as to why i am different...Could it be because it's through a UINavigationController? or because i load the main application via a plist and my main looks like so
retVal = UIApplicationMain(argc, argv, nil, nil);
I am quite thoroughly stumped.
In order to detect shake gesture you need to subclass the UIView and implement the following methods (Do not implement these methods on UIViewController):
(BOOL)canBecomeFirstResponder
(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
Then add the subclassed view to UIViewController and make it first responder by calling -becomeFirstResponder on it.
You don't need to set [application setApplicationSupportsShakeToEdit:YES]; because this is the default value and iOS use this only for Shake to Undo/Redo.
If you want to capture the motion in your view controller you need to set this property to NO [application setApplicationSupportsShakeToEdit:NO]; and handle it by yourself.
As described in Event Handling Programming Guide.
Hope this helps.
PS: Just in case, you call the wrong super in your viewDidAppear method. This should be :
- (void) viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self becomeFirstResponder];
}
Thank you all for your responses but i ended up using a different method i accessed the accelerometer in the app delegate and then send a nsnotifcation via the nsnotification center to the current ui navigation controller displayed
- (void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
[[NSNotificationCenter defaultCenter] postNotificationName:notificationName object:nil userInfo:nil];
}
In the view controller for my audio player I've added this:
- (void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (void) viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
}
- (BOOL)canBecomeFirstResponder {
return YES;
}
This switches the icon in the player controls from the iPod icon to my own app, it also puts the little playback icon in the status bar.
Next I added this to my view controller to handle the remote events:
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
NSLog(#"REMOTE EVENT!");
switch (event.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
[streamer pause];
break;
case UIEventSubtypeRemoteControlPlay:
[streamer start];
break;
case UIEventSubtypeRemoteControlPause:
[streamer pause];
break;
case UIEventSubtypeRemoteControlStop:
[streamer stop];
break;
default:
break;
}
}
However, this is never called. I tried bringing up the playback controls while the app was running, I tried going back to my home screen and tapping some playback controls, and I tried my earbuds' controls. All had no luck.
Does anyone have any pointers as to where I can be going wrong?
Thanks.
You have implemented the wrong method: instead of - (void) viewWillAppear:(BOOL)animated it should have been - (void)viewDidAppear:(BOOL)animated.
I ran into this problem before and discovered that in my problem it was because my view was a subview and the parent was catching the remote events. I would start in the AppDelegate and implement the method and see if anything is being sent to the AppDelegate and then trace it down from there. Chances are there is a view or viewController that is catching the event and not passing it along.
Have you made sure to set your audio session? Use AVAudioSession and set the category to AVAudioSessionCategoryPlayback before becoming first responder.