Question

我遇到了AVAudioPlayer类的奇怪问题。每当我尝试访问其中一个属性时，它们都为空。

// Get the file path to the song to play.
 NSString *filePath = [[[NSBundle mainBundle] pathForResource:pSound.fileName 
               ofType:pSound.fileType] retain];

 // Convert the file path to a URL.
 NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];

 NSError* err;
 //Initialize the AVAudioPlayer
 self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:&err];

    if( err ){
  NSLog(@"Initializing failed with reason: %@", [err localizedDescription]);
 }
 else{
  [self.audioPlayer setDelegate:self];
  [self.audioPlayer prepareToPlay];
  self.playCount = self.playCount + 1;
        NSLog(@"%@", [self.audioPlayer isPlaying]); //this displays null; also if I call it at a later time
 };

 [filePath release];
 [fileURL release];

任何想法？

编辑：奇怪的是，当我保存isPlaying到bool并打印bool我得到一个值...

Answer 1

NSLog(@"%@", [self.audioPlayer isPlaying]);

％@ - 表示您要打印[yourObject toString]的结果所以如果你想检查[self.audioPlayer isPlaying]返回的bool值 - 你应该使用％d。

P.S。不要忘记打电话[audioPlayer play]; ;）

Answer 2

您可以使用（audioPlay.playing）代替[audioPlayer isPlaying]

if (audioPlayer.playing) {
        [audioPlayer stop];
} else {
        [audioPlayer play];
}

AVAudioPlayer isPlaying始终返回null

2 个答案: