想在swift中使用.amr音频格式文件创建一个应用程序

Question

您好我想创建一个音频播放器应用程序，其中包含大约250首歌曲。应用必须离线工作。所以，我试图使用.aac和.mp3格式的音频，但应用程序的大小增加到300Mb附近。

现在我想要使用.amr格式，但模拟器不适用于.amr格式。需要建议。

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    playList = [
        URL(fileURLWithPath:Bundle.main.path(forResource: "vpn01", ofType: "aac")!),
        URL(fileURLWithPath:Bundle.main.path(forResource: "vpn02", ofType: "aac")!),
        URL(fileURLWithPath:Bundle.main.path(forResource: "vpn01", ofType: "aac")!),
        URL(fileURLWithPath:Bundle.main.path(forResource: "vpn04", ofType: "aac")!),
        URL(fileURLWithPath:Bundle.main.path(forResource: "vpn05", ofType: "aac")!),
        URL(fileURLWithPath:Bundle.main.path(forResource: "vpn06", ofType: "aac")!),
        URL(fileURLWithPath:Bundle.main.path(forResource: "vpn07", ofType: "aac")!)]

Answer 1

Check the following points:

不再支持AMR（对于≥iOS4.3，请参阅Apple iOS SDK文档中支持的音频格式）。您想使用AVPlayer（音频和视频）还是只想要音频？仅用于音频AVAudioPlayer。以下代码段显示了如何处理它。如果你想使用AVAudioPlayer，你的自我实例是否实现了AVAudioPlayerDelegate协议？您的自我实例是否实现了AVAudioPlayerDelegate协议？你有没有正确添加和链接AVAudioFoundation框架（#import）？

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"audio" ofType:@"m4a"]];

    NSError *error = noErr;
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    if (error)
    {
        NSLog(@"Error in audioPlayer: %@", [error localizedDescription]);
    }
    else 
    {
        self.audioPlayer.delegate = self;
        [self.audioPlayer prepareToPlay];
    }
}

- (void)playAudio
{
    [self.audioPlayer play];
}