AVAudioPlayer 和按钮按下

Question

嘿，我正在设计一个 iphone 应用程序，它以编程方式将按钮加载到滚动视图中并播放声音。我已经让声音按顺序播放，这很棒，但是每当我尝试按下按钮时，它不会记录按钮按下，直到序列中的最后一个声音开始播放。这是我播放 AVAudioPlayer 的主视图控制器中的代码：

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
for (menuCount = 0; menuCount < [ivrTree count]; menuCount++ ) {

    currentScript = [ivrTree objectAtIndex: menuCount];

    for (btnCount = 0; btnCount < [currentScript.menuChoices count]; btnCount = btnCount) {
        currentChoice = [currentScript.menuChoices objectAtIndex: btnCount];
        if (![thePlayer isPlaying]) {
            if (!mute) {
                [self playPromptAudiofromSRC:self src:currentChoice.audioSRC];
            }
            btnCount++;
        }
    }
}
thisMenuPlayed = true;

}
- (void)playPromptAudiofromSRC:(id)parent src:(NSString *)src {

NSURL *fileURL;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *audioPrompt = [NSString stringWithFormat:@"%@%@", [defaults stringForKey:CONFIG_IVR_HOST], src];

if ([src isEqualToString:@""] || src == nil) {
    audioPrompt = @"silence1sec";
    NSString *path = [[NSBundle mainBundle] pathForResource:audioPrompt ofType:@"wav"];
    fileURL = [NSURL fileURLWithPath:path];
} else {
    fileURL = [NSURL URLWithString:audioPrompt];
}

AudioServicesDisposeSystemSoundID (_audioPromptSound);
AudioServicesCreateSystemSoundID((CFURLRef)fileURL, &_audioPromptSound);
AudioServicesPlaySystemSound(_audioPromptSound);

//NSLog(@"Audio SRC: %@", audioPrompt);
NSData *soundData = [NSData dataWithContentsOfURL:fileURL];
NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"sound.caf"];

[soundData writeToFile:filePath atomically:YES];

AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL
                                                       fileURLWithPath:filePath] error:NULL];  
self.thePlayer = player;
[player release];
[thePlayer prepareToPlay];
[thePlayer setVolume:1.0f];
[thePlayer play];
}

我不知道为什么这只会在整个播​​放后记录按钮按下。我正在尝试实现一个静音按钮和一种在音频播放时“插入”音频的方法。提前感谢您的帮助

Answer 1

编辑：

添加委托：

在您的 .h 文件中：

@interface ViewController : UIViewController<AVAudioPlayerDelegate>{
}

在您的 .m 文件中：

thePlayer.delegate = self;
[thePlayer play];

正如我所见，您的 animationDidStop 可能存在问题，因为无论您做什么，它都会遍历所有声音。我将尝试逐行逐句解释我的目标（并且由于我看不到您的整个代码，所以会有一些猜测）。

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
// Iterate through array ivrTree elements.
for (menuCount = 0; menuCount < [ivrTree count]; menuCount++ ) {

    // Starting with currentScript = ivrTree objectAtIndex 0
    currentScript = [ivrTree objectAtIndex: menuCount];

    //Iterate through menuChoices, Starting with objectAtIndex 0
    for (btnCount = 0; btnCount < [currentScript.menuChoices count]; btnCount = btnCount) {
        //Set currentChoice to menuChoices objectAtIndex 0
            currentChoice = [currentScript.menuChoices objectAtIndex: btnCount];
        //Will try to run playPromptAudiofromSRC if thePlayer isn't playing. Will 1st run evaluate as false and therefor will play.
            if (![thePlayer isPlaying]) {
                if (!mute) {
                    [self playPromptAudiofromSRC:self src:currentChoice.audioSRC];
                }
        //Will increment btnCount to 1 when the audio has played through.
            btnCount++;
            }
        //If sound hasn't finished playing it will stay in the for loop and keep trying until first sound is done playing.
    }
//Will increment menuCount 1 and start the next for loop all over again.
}
thisMenuPlayed = true;
}

你能看出我在说什么吗？如果您启动乐器并检查正在发生的事情，我很确定您会看到活动高峰，直到所有声音都播放完后才会消退。 我认为这种方法的编写方式会锁定您的设备。希望对您有所帮助。