iOS中获取音频文件的时长

// 音频文件路径
NSString *path = manager.recorder.url.path;
NSURL *assetUrl = [NSURL fileURLWithPath:path];
// 封装成多媒体资源对象
AVURLAsset* audioAsset =[AVURLAsset URLAssetWithURL:assetUrl options:nil];
CMTime audioDuration = audioAsset.duration;
float audioDurationSeconds = CMTimeGetSeconds(audioDuration);