This is a similar question to this. But I still can't quite figure out what to do.
So, I have a tabbar app that functions similar to an ipod. One view controller is the "NOW PLAYING" view controller and it is the view controller at index 1. So, in that VC I have:
- (void)viewDidAppear:(BOOL)animated
{
// Turn on remote control event delivery
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
// Set itself as the first responder
[self becomeFirstResponder];
}
- (BOOL)canBecomeFirstResponder
{
return YES;
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)event
{
NSLog(#"Where is my event?");
if(event.type == UIEventTypeRemoteControl)
{
switch (event.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
NSLog(#"Pause");
break;
case UIEventSubtypeRemoteControlNextTrack:
NSLog(#"Next");
break;
case UIEventSubtypeRemoteControlPreviousTrack:
NSLog(#"Prev");
break;
default:
NSLog(#"SOMETHING WAS CLICKED");
break;
}
}
}
I don't receive any events on remote clicks either on the headphones or on the double-home button click shortcuts. I am running on an actual iPhone, not in the simulator. I am using a AVQueuePlayer (which IS playing) to manage my media.
I just shoved everything into the AppDelegate and told the AppDelegate to call to the ViewController to tell it what to do and it worked fine. Is it poor practise to put it in the AppDelegate?
Related
I have an application that plays music and want to use lockscreen control (play/pause).
With NSLog I can see that my app get's the button trigger but not theUIEventSubtypeRemoteControlTogglePlayPause.
Here's a bit of my code:
- (void)viewDidLoad {
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (BOOL)canBecomeFirstResponder {
return YES;
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent
{
NSLog(#"REMOTE RECEIVE");
if (receivedEvent.type == UIEventTypeRemoteControl)
{
NSLog(#"received remote event");
switch (receivedEvent.subtype)
{
case UIEventSubtypeRemoteControlTogglePlayPause:
NSLog(#"toggle button received");
//[self togglePlayPauseTapped: nil];
break;
default:
break;
}
}
I get "REMOTE RECEIVE" and "received remote event" from the NSLog Output but not the line inside ...TogglePlayPause.
Any ideas?
use the case
UIEventSubtypeRemoteControlPause
UIEventSubtypeRemoteControlPlay
for iOS 7
The accepted answer is not clear.
UIEventSubtypeRemoteControlPlay, UIEventSubtypeRemoteControlPause and UIEventSubtypeRemoteControlStop are called within the user interaction.
UIEventSubtypeRemoteControlTogglePlayPause is called within headset interaction.
How can I make my cocoalibspotify app for iOS respond to the built-in pause/play and next/previous controls? I see no documentation of this.
In the main view controller, the app needs to subscribe to remote control events.
- (void)viewDidLoad {
// ...
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
// ...
}
Remote control button presses will then trigger remoteControlReceivedEvent: on your view controller. The event can be handled as follows.
- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {
if (receivedEvent.type == UIEventTypeRemoteControl) {
switch (receivedEvent.subtype) {
case UIEventSubtypeRemoteControlPause:
// Handle pause
break;
case UIEventSubtypeRemoteControlPlay:
// Handle play
break;
case UIEventSubtypeRemoteControlPreviousTrack:
// Handle Previous
break;
case UIEventSubtypeRemoteControlNextTrack:
// Handle Next
break;
default:
break;
}
}
}
I'm writing an app that streams music and I'm having a ton of trouble setting the icon on the music control dock screen (when you double-click the home button and swipe to the left). All the documentation said to do something like this, but the icon never appears and I don't ever receive the event notification. All of this code is in my player view controller. _radioPlayer is an instance of an AVQueuePlayer. What am I doing wrong here?
- (void)viewWillAppear:(BOOL)animated
{
UIApplication *application = [UIApplication sharedApplication];
if([application respondsToSelector:#selector(beginReceivingRemoteControlEvents)])
[application beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (BOOL)canBecomeFirstResponder
{
return YES;
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
switch (event.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
[_radioPlayer pause];
break;
case UIEventSubtypeRemoteControlPlay:
[_radioPlayer play];
break;
case UIEventSubtypeRemoteControlPause:
[_radioPlayer pause];
break;
default:
break;
}
}
EDIT: I read through the documentation and followed the steps but it's still not working. Here are some of the possible reasons I've come up with:
A. My music isn't playing yet when viewDidAppear is called. In the documentation it states
"Your app must be the “Now Playing” app. Restated, even if your app is the first responder >and you have turned on event delivery, your app does not receive remote control events until >it begins playing audio."
I tried calling beginReceivingRemoteControlEvents: and becomeFirstResponder: after the music starts playing but this doesn't work either. Can these only be called in viewDidAppear:? Does iOS automatically detect when the music begins playing so this isn't necessary?
B. There is something weird about using an AVQueuePlayer. I'm almost positive this isn't it since the event message is handled by the view controller, not the player itself.
It may not working for you because you are calling beginReceivingRemoteControlEvents in viewWillAppear instead of viewDidAppear. Check out the documentaion -
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// Turn on remote control event delivery
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
}
I want to detect headset button click on iPhone, see Detect headset button click on iPhone SDK.
I follow as the http://developer.apple.com/library/IOS/#documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/RemoteControl/RemoteControl.html,
then I wrote code as below, but it cannot work!!
- (BOOL)canBecomeFirstResponder
{
return YES;
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent
{
if (receivedEvent.type == UIEventTypeRemoteControl) {
NSLog(#"Remote Control Event");
switch (receivedEvent.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
NSLog(#"UIEventSubtypeRemoteControlTogglePlayPause");
break;
default:
break;
}
}
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated
{
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
[super viewWillDisappear:animated];
}
My Problem is that I cannot catch remote control event. When play or pause button on headset clicked, console prints nothing! Who can help me? Thank you.
Is your Info.plist updated to indicate that you support audio?
From http://www.iphonedevsdk.com/forum/iphone-sdk-development/44433-there-way-respond-clicks-headphone-buttons.html
Add the new line, and select "Required Background Modes". In the "Item 0" that appears under/next to it, select "App plays audio".
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.