如何從xcode中的目錄文件播放音頻？

Question

我試圖設計音頻流應用程序一切正常，但我不知道如何下載音頻文件到設備並閱讀後記。

1. Download audio to document directory.
2. play it back from document directory.

添加代碼：

NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentDirectory = [path firstObject]; 
NSString *filePath = [documentDirectory stringByAppendingPathComponent:@"evet.mp3"]; 
// UIImage *cellImage = [[UIImage alloc] initWithContentsOfFile:filePath]; 
NSLog(@"%@",filePath); 
NSError *error; 
NSData *_objectData = [NSData dataWithContentsOfURL:[NSURL URLWithString:filePath]]; 
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:_objectData error:&error]; 
[audioPlayer play]; 

Answer 1

根據您發佈試試這個代碼

。

變化

NSData *_objectData = [NSData dataWithContentsOfURL:[NSURL URLWithString:filePath]]; 
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:_objectData error:&error]; 

這樣：

NSURL *fileURL = [NSURL fileURLWithPath:filePath isDirectory:NO]; 
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:&error]; 

AVAudioPlayer想要一個URL對象（必須是本地URL不是遠程Web地址，因此fileURLWithPath:）而不是數據本身。

您試圖將NSData本身提供給音頻播放器。

Answer 2

獲取您的音頻文件中的文件目錄

- (NSString *)getCacheDirectoryPathForAudio:(NSString *)filePath 
{ 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it 
    NSString *documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory 

    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp3", filePath]]; //add 

    return fullPath; 
} 

啓動播放器，文件路徑

NSString *pathToSaveAudioString = [self getCacheDirectoryPathForAudio:@「filename」]; 

    NSURL* url = [NSURL fileURLWithPath:pathToSaveAudioString]; 
    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:pathToSaveAudioString]; 
    if (fileExists) { 
     NSError* error = nil; 
     self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; 
     [self.player setDelegate:self]; 
     if(!self.player) 
     { 
      NSLog(@"Error creating player: %@", error); 
     } 
    } 
    else 
    { 
      NSLog(@「File Not Exist: %@"); 
    } 

，並使用

[self.player play]; 

使用委託方法來檢查狀態

玩

#pragma mark - AVAudioPlayerDelegate 
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag 
{ 

} 

- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error 
{ 

} 

更多詳細信息關於 http://iosdeveloperzone.com/2012/10/01/tutorial-playing-audio-with-avaudioplayer/