在 WatchKit OS2 中播放音频文件

Question

正在从 phone 发送 MP3：

NSArray *pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);  
NSString *documentsDirectory = [pathArray objectAtIndex:0];  

NSString *yourSoundPath = [documentsDirectory stringByAppendingPathComponent:@"MyMusic.mp3"];  
NSURL *url = [NSURL fileURLWithPath:yourSoundPath isDirectory:NO];  
[self.session transferFile:url metadata:nil];

我是如何尝试在手表上接收和播放文件的：

-(void)session:(WCSession *)session didReceiveFile:(WCSessionFile *)file {  
    dispatch_async(dispatch_get_main_queue(), ^{  

        NSLog(@"URL%@" , file.fileURL.filePathURL);  

        NSDictionary *options = @{  
                                  WKMediaPlayerControllerOptionsAutoplayKey : @YES  
                                  };  

        [self presentMediaPlayerControllerWithURL:file.fileURL.filePathURL options:options completion:^(BOOL didPlayToEnd, NSTimeInterval endTime, NSError * __nullable error) {  
            if (!didPlayToEnd) {  
                NSLog(@"The player did not play all the way to the end. The player only played until time - %.2f.", endTime);  
            }  

            if (error) {  
                NSLog(@"There was an error with playback: %@.", error);  
            }  
        }];  
    });  
}

此文件的 URL:

file:///var/mobile/Containers/Data/PluginKitPlugin/-------/Documents/Inbox/com.apple.watchconnectivity/------/Files/----/MyMusic.mp3

这是错误：

There was an error with playback: Error Domain=com.apple.watchkit.errors Code=4 "The requested URL was not found on this server." UserInfo={NSUnderlyingError=0x16d4fa10 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}, NSLocalizedDescription=The requested URL was not found on this server.}.

如何在 watchOS 2 中播放此文件？

Answer 1

要使手表应用能够播放音频文件，您必须将其移动到共享应用组容器。

您需要在 WatchKit 扩展程序和 WatchKit 应用程序之间启用共享应用程序组。

如果您没有将文件放在共享容器中，则预计音频播放会失败。在移动文件之前，您也不应离开回调队列，因为 WCSession 将在回调 returns.

时删除文件

这是 Apple 关于此主题的 tutorial that explains how to do it, and some information。

编辑：添加示例

一旦您为 WatchKit 应用程序和扩展程序启用了应用程序组容器，这样的事情应该会起作用：

- (void)session:(WCSession * __nonnull)session didReceiveFile:(WCSessionFile * __nonnull)file
{
    NSLog(@"received file %@, metadata: %@", file, file.metadata);

    NSFileManager *fm = [NSFileManager defaultManager];
    NSError *error = nil;
    NSURL *containerURL = [fm containerURLForSecurityApplicationGroupIdentifier:@"<YOUR APP GROUP HERE>"];
    NSString *documentsPath = [containerURL path];
    NSString *dateString = [[[NSDate date] description] stringByAppendingString:@"-"];
    NSString *fileNameWithDate = [dateString stringByAppendingString:file.fileURL.lastPathComponent];
    documentsPath = [documentsPath stringByAppendingPathComponent:fileNameWithDate];
    if ([fm moveItemAtPath:[file.fileURL.path stringByExpandingTildeInPath] toPath:documentsPath error:&error]) {
        if ([fm fileExistsAtPath:documentsPath isDirectory:nil]) {
            NSLog(@"moved file %@ to %@", file.fileURL.path, documentsPath);
            dispatch_async(dispatch_get_main_queue(), ^{
                NSDictionary *options = @{ WKMediaPlayerControllerOptionsAutoplayKey : @YES };
                [self presentMediaPlayerControllerWithURL:[NSURL fileURLWithPath:documentsPath] options:options completion:^(BOOL didPlayToEnd, NSTimeInterval endTime, NSError * __nullable playAudioError) {
                    if (!didPlayToEnd) {
                        NSLog(@"The player did not play all the way to the end. The player only played until time - %.2f.", endTime);
                    }

                    if (playAudioError) {
                        NSLog(@"There was an error with playback: %@.", playAudioError);
                    }
                }];
             });


        } else {
            NSLog(@"failed to confirm move of file %@ to %@ (%@)", file.fileURL.path, documentsPath, error);
        }
    } else {
        NSLog(@"failed to move file %@ to %@ (%@)", file.fileURL.path, documentsPath, error);
    }
}

在 WatchKit OS2 中播放音频文件

Play Audio File in WatchKit OS2

path

watchkit

nsurl

watchos-2

watchconnectivity