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AVAudioPlayer 通过播放音频发现AVAudioPlayer的duration属性会变，当快播放到最后的时候duration属性才是准确的，如下图：
image.png
所以解决办法就是将AVAudioPlayer的currentTime设置到靠近最后位置，然后duration属性就是正常了
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:filePath error:&error];
if (error) {
NSLog(@"创建录音播放对象发生错误，错误信息是：%@",error.localizedDescription);
}else {
self.audioPlayer.delegate = self;
self.audioPlayer.meteringEnabled = YES;
self.audioPlayer.numberOfLoops = 0;
[self.audioPlayer prepareToPlay];
// 获取准确的时长
NSLog(@"1.-----%f",self.audioPlayer.duration);
_audioPlayer.currentTime = self.audioPlayer.duration;
NSLog(@"2.-----%f",self.audioPlayer.duration);
_audioPlayer.currentTime = 0;
NSLog(@"3.-----%f",self.audioPlayer.duration);
}
