Question

好吧所以我在我的应用程序中设置了我的监听器，所以当我点击外部音量按钮时它正在读取。我的问题是，似乎我被困在这上面，我的应用程序中有两个按钮，标识为：

- (IBAction)sendMessage:(id)sender;
- (IBAction)cancelMessage:(id)sender;

当我点击iPad上的Up ^物理按钮时，我希望它与

链接

- (IBAction)sendMessage:(id)sender;

使用向下物理按钮，需要链接， - （IBAction）cancelMessage：（id）发件人;

这是我坚持的代码：

#import "FirstViewController.h"
#import "AppDelegate.h"
#import "AudioToolbox/AudioServices.h"
#import <MediaPlayer/MediaPlayer.h>



@interface FirstViewController ()


@property (nonatomic, strong) AppDelegate *appDelegate;

-(void)sendMyMessage;
-(void)didReceiveDataWithNotification:(NSNotification *)notification;

@end

@implementation FirstViewController

// ADDED THIS SECTION------------------------------------------------------------

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

// ADDED THIS SECTION------------------------------------------------------------


int Count=0;

- (void)viewDidLoad
{
 // ADDED THIS SECTION------------------------------------------------------------


    UISwitch *switcher = [[UISwitch alloc] init];
    switcher.center = self.view.center;
    [switcher addTarget: self action: @selector(volumeListener_onOff:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:switcher];

 // ADDED THIS SECTION------------------------------------------------------------



    [super viewDidLoad];



    // Do any additional setup after loading the view, typically from a nib.

    _appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    _txtMessage.delegate = self;

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(didReceiveDataWithNotification:)
                                                 name:@"MCDidReceiveDataNotification"
                                               object:nil];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}



 // ADDED THIS SECTION------------------------------------------------------------
 // ADDED THIS SECTION------------------------------------------------------------

- (void) volumeListener_onOff:(id)sender
{
    UISwitch *onOff = (UISwitch *) sender;

    if(onOff.on){
        volumeListener = [[VolumeListener alloc] init];
        [[self.view viewWithTag:54870149] removeFromSuperview];
        [self.view addSubview: [volumeListener dummyVolume]];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(volumeChanged:) name:@"AVSystemController_SystemVolumeDidChangeNotification" object:nil];
    }
    else{
        [[NSNotificationCenter defaultCenter] removeObserver:self name:@"AVSystemController_SystemVolumeDidChangeNotification" object:nil];
        [[self.view viewWithTag:54870149] removeFromSuperview];
    }
}


 // ADDED THIS SECTION------------------------------------------------------------
 // ADDED THIS SECTION------------------------------------------------------------


- (void)volumeChanged:(NSNotification *)notification{
    if(volumeListener.runningVolumeNotification==FALSE){
        dispatch_async(dispatch_get_main_queue(), ^{
            volumeListener.runningVolumeNotification = TRUE;
            MPMusicPlayerController *musicPlayer = [MPMusicPlayerController iPodMusicPlayer];
            [musicPlayer setVolume:volumeListener.systemVolume];

            // do what you want to accomplish here
            [self.view setAlpha:0.0f];
            [UIView beginAnimations:@"flash screen" context:nil];
            [UIView setAnimationDuration:0.1f];
            [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
            [self.view setAlpha:1.0f];
            [UIView commitAnimations];

            dispatch_async(dispatch_get_global_queue(0, 0), ^{
                volumeListener.runningVolumeNotification = FALSE;
            });
        });
    }
}

// ADDED THIS SECTION------------------------------------------------------------
// ADDED THIS SECTION------------------------------------------------------------

#pragma mark - UITextField Delegate method implementation

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    [self sendMyMessage];
    return YES;
}


#pragma mark - IBAction method implementation

- (IBAction)sendMessage:(id)sender {
    [self sendMyMessage ];
}

- (IBAction)cancelMessage:(id)sender {
    [self sendMyadditionMessage ];
}


#pragma mark - Private method implementation

// THIS IS THE SECTION FOR ADDITION ----------------------------------------------------------
// ---------------------------------------------------------------------------------------------
// ---------------------------------------------------------------------------------------------

-(void)sendMyMessage{


    NSData *dataToSend = [_txtMessage.text dataUsingEncoding:NSUTF8StringEncoding];
    NSArray *allPeers = _appDelegate.mcManager.session.connectedPeers;
    NSError *error;

    [_appDelegate.mcManager.session sendData:dataToSend
                                     toPeers:allPeers
                                    withMode:MCSessionSendDataReliable
                                       error:&error];

    if (error) {
        NSLog(@"%@", [error localizedDescription]);
    }

    [_tvChat setText:[_tvChat.text stringByAppendingString:[NSString stringWithFormat:@"\n%@\n\n", _txtMessage.text]]];
    [_txtMessage setText:@""];

    // THIS IS WHAT STARTS THE COUNT FOR THE TEXT
    NSString *numValue = [[NSString alloc] initWithFormat:@"%d", Count--];
    _txtMessage.text = numValue;
    // END CODE FOR COUNT

}


// START SECTION FOR ADDITION ---------------------------------------------------------------
// ---------------------------------------------------------------------------------------------
// ---------------------------------------------------------------------------------------------

-(void)sendMyadditionMessage{
    NSData *dataToSend = [_txtMessage.text dataUsingEncoding:NSUTF8StringEncoding];
    NSArray *allPeers = _appDelegate.mcManager.session.connectedPeers;
    NSError *error;

    [_appDelegate.mcManager.session sendData:dataToSend
                                     toPeers:allPeers
                                    withMode:MCSessionSendDataReliable
                                       error:&error];

    if (error) {
        NSLog(@"%@", [error localizedDescription]);
    }

    [_tvChat setText:[_tvChat.text stringByAppendingString:[NSString stringWithFormat:@"\n%@\n\n", _txtMessage.text]]];
    [_txtMessage setText:@""];

    // THIS IS WHAT STARTS THE COUNT FOR THE TEXT
    NSString *numValue = [[NSString alloc] initWithFormat:@"%d", Count++];
    _txtMessage.text = numValue;
    // END CODE FOR COUNT


    if(Count == 3) {
        return [self vibrate];
    };
}


// END SECTION FOR ADDITION ---------------------------------------------------------------
// ---------------------------------------------------------------------------------------------
// ---------------------------------------------------------------------------------------------

-(void)vibrate
{
    NSLog(@"I'm vibrating");
    AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
}


-(void)didReceiveDataWithNotification:(NSNotification *)notification{
    MCPeerID *peerID = [[notification userInfo] objectForKey:@"peerID"];
    NSString *peerDisplayName = peerID.displayName;

    NSData *receivedData = [[notification userInfo] objectForKey:@"data"];
    NSString *receivedText = [[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];

    [_tvChat performSelectorOnMainThread:@selector(setText:) withObject:[_tvChat.text stringByAppendingString:[NSString stringWithFormat:@"%@ wrote:\n%@\n\n", peerDisplayName, receivedText]] waitUntilDone:NO];
}

@end

Answer 1

我可以提出建议吗？使用RBVolumeButtons，这是一个开源类，可让您轻松窃取音量按钮。我在我的应用程序中使用它，它完美无缺。如果您对如何使用它有任何疑问，请与我们联系。

iOS音量按钮控制器应用按钮

1 个答案: