Question

我正在尝试做一个简单的基于AVAudioPlayer的应用程序，按下按钮时播放2个不同的音乐，有2个视图，第一个是主视图包含2个按钮，每个按钮设置一首名为整数的歌曲（1.mp3），2.mp3 .....等）这里是代码

#import "podHome.h"
#import "podMusic.h"
#import "ArabAppDelegate.h"


@implementation podHome

@synthesize song1;
@synthesize tabi;   
int CurrentPlay;
NSString *Currenttxt;


-(IBAction)uae{
    CurrentPlay=1;
    Currenttxt=@"uae";
    podMusic *newContro=[[podMusic alloc] init];
    [newContro setCurrentPlay1:CurrentPlay setCurrentText:Currenttxt];

    ArabAppDelegate *theDelegate = (ArabAppDelegate*)[[UIApplication sharedApplication] delegate];
    tabi = theDelegate.tabcontrolPod;
    tabi.selectedIndex = 1;
    [newContro release];
}

-(IBAction)libya{
    CurrentPlay=2;
    Currenttxt=@"uae";
    podMusic *newContro=[[podMusic alloc] init];
    [newContro setCurrentPlay1:CurrentPlay setCurrentText:Currenttxt];

    ArabAppDelegate *theDelegate = (ArabAppDelegate*)[[UIApplication sharedApplication] delegate];
    tabi = theDelegate.tabcontrolPod;
    tabi.selectedIndex = 1;
    [newContro release];
}

这两个按钮（IBActions）连接到两个按钮，当按下其中一个按钮时，它将改变到另一个视图并开始播放该歌曲

- (void)viewWillAppear:(BOOL)animated {

    if((played == 1)&&(isBacked==FALSE)){

    NSString *filePath = [[NSBundle mainBundle] pathForResource:texting 
                                                         ofType:@"txt"];

    NSString *filenameString = [NSString stringWithContentsOfFile:filePath usedEncoding:nil error:nil];
    CurrentTex.text = filenameString;
    AudioSessionInitialize(NULL, NULL, NULL, NULL);
        UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
        AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,sizeof(sessionCategory), &sessionCategory);
        AudioSessionSetActive(YES);  

        playBtnBG = [[UIImage imageNamed:@"play-pod.png"] retain];
        pauseBtnBG = [[UIImage imageNamed:@"pause-pod.png"] retain];
        [playButton setBackgroundImage:pauseBtnBG forState:UIControlStateNormal];

        [self registerForBackgroundNotifications];

        updateTimer = nil;

        duration.adjustsFontSizeToFitWidth = YES;
        currentTime.adjustsFontSizeToFitWidth = YES;
        progressBar.minimumValue = 0.0; 
        NSString *path=[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%d",CurrentPlay] ofType:@"mp3"];
        self.player=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
        [player stop];
        //self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];    
        if (self.player)
        {
            [self updateViewForPlayerInfo:player];
            [self updateViewForPlayerState:player];
            player.numberOfLoops = 0;
            player.delegate = self;
        }
        [self startPlaybackForPlayer:player];
        fileName.text= [[NSString alloc]initWithFormat:@"%@", songName];
      // [fileURL release];
//        CurrentPlay = 0;
               isBacked = TRUE;
    }

        [super viewWillAppear:animated];
}

- (void)setCurrentPlay1:(int)varP setCurrentText:(NSString *)varT{

    CurrentPlay = varP;
    texting = varT;
    played = 1;
    isBacked = FALSE;
}

但问题是，当歌曲正在播放并回到主视图并按下另一首歌曲的按钮时，它会同时开始播放第一首歌曲，我认为第一首应该停止开始另一首歌曲，我应该释放什么呢？

Answer 1

我的猜测是你有两个AVAudioPlayer实例，当你把它们都设置为播放时，它们都会这样做！

一种解决方案是告诉其他玩家在激活新玩家时停止，但随着玩家数量的增加，这很快就会变得麻烦。

相反，你最好只设置一个播放器，并根据按下的按钮更改它的歌曲。这样，两个音乐曲目就不可能同时播放。

Answer 2

在你的第一个按钮动作中写这样的。

if(player2.isPlaying)
{
[player2 stop];
}

以同样的方式在第二个按钮动作中做同样的事情。

if(player1.isPlaying)
{
[player1 stop];
}

播放第二个声音

2 个答案: