要求： 我们能够从主机设备连接到多个从设备。例如，如果设备 A 向设备 B 和 C 发起连接，则贡献者设备可以接受对等连接并连接到设备 A。这里 A 是主设备，B 和 C 是贡献者设备。现在如果 B 将他们的歌曲分享给 A，A 就可以播放歌曲并查看歌曲信息。与此同时，C 将处于空闲状态，但应该连接。当 B 播放完歌曲后， C 也可以将自己的歌曲分享到设备 A。
以下是我们在完成上述任务时遇到的问题： 1. B 开始向 A 分享歌曲时，C 就崩溃了。但是 A 仍然可以播放 B 共享的歌曲。
array = [[NSMutableArray alloc] initWithObjects:[self.session connectedPeers], nil];
[_session sendData:[NSKeyedArchiver archivedDataWithRootObject:[info mutableCopy]] toPeers:[array objectAtIndex:0] withMode:MCSessionSendDataUnreliable error: &error];
NSLog(@"localizedDescription %@",error);
- 为了克服这个问题，直接在这里传递没有索引的数组
toPeers:array。它正在工作，我们能够与设备 A 共享和播放歌曲，但设备 A 无法接收歌曲信息。
以下是我们正在使用的完整代码：贡献者控制器：
- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
{
[self dismissViewControllerAnimated:YES completion:nil];
someMutableArray = [mediaItemCollection items];
counter = 0;
if(someMutableArray.count>1){
BOOL isselectsongone=YES;
[[NSUserDefaults standardUserDefaults] setBool:isselectsongone forKey:@"isselectsongone"];
}
[self showSpinner];
[self someSelector:nil];
}
- (void)someSelector:(NSNotification *)notification {
if(notification && someMutableArray.count>1 && counter <someMutableArray.count-1){
NSDate *start = [NSDate date];
counter=counter+1;
[self.outputStreamer stop];
self.outputStreamer = nil;
self.outputStream = nil;
}
song=[someMutableArray objectAtIndex:counter];
NSMutableDictionary *info = [NSMutableDictionary dictionary];
info=[[NSMutableDictionary alloc] init];
info[@"title"] = [song valueForProperty:MPMediaItemPropertyTitle] ? [song valueForProperty:MPMediaItemPropertyTitle] : @"";
info[@"artist"] = [song valueForProperty:MPMediaItemPropertyArtist] ? [song valueForProperty:MPMediaItemPropertyArtist] : @"";
//NSNumber *duration=[song valueForProperty:MPMediaItemPropertyPlaybackDuration];
int fullminutes = floor([timeinterval floatValue] / 60); // fullminutes is an int
int fullseconds = trunc([duration floatValue] - fullminutes * 60); // fullseconds is an int
[NSTimer scheduledTimerWithTimeInterval:[duration doubleValue]target:self selector:@selector(getdata) userInfo:nil repeats:YES];
}
-(void)getdata {
NSMutableDictionary *info = [NSMutableDictionary dictionary];
info=[[NSMutableDictionary alloc] init];
info[@"title"] = [song valueForProperty:MPMediaItemPropertyTitle] ? [song valueForProperty:MPMediaItemPropertyTitle] : @"";
info[@"artist"] = [song valueForProperty:MPMediaItemPropertyArtist] ? [song valueForProperty:MPMediaItemPropertyArtist] : @"";
NSNumber *duration=[song valueForProperty:MPMediaItemPropertyPlaybackDuration];
int fullminutes = floor([duration floatValue] / 60); // fullminutes is an int
int fullseconds = trunc([duration floatValue] - fullminutes * 60); // fullseconds is an int
info[@"duration"] = [NSString stringWithFormat:@"%d:%d", fullminutes, fullseconds];
MPMediaItemArtwork *artwork = [song valueForProperty:MPMediaItemPropertyArtwork];
UIImage *image = [artwork imageWithSize:CGSizeMake(150, 150)];
NSData * data = UIImageJPEGRepresentation(image, 0.0);
image = [UIImage imageWithData:data];
array = [[NSMutableArray alloc] initWithObjects:[self.session connectedPeers], nil];
MCPeerID* peerID11 = self.session.myPeerID;
NSMutableArray *arr=[[NSMutableArray alloc] initWithObjects:peerID11, nil];
NSLog(@"%@",arr);
if (image)
self.songArtWorkImageView.image = image;
else
self.songArtWorkImageView.image = nil;
self.songTitleLbl.text = [NSString stringWithFormat:@"%@ \n[Artist : %@]", info[@"title"], info[@"artist"]];
NSError *error;
[_session sendData:[NSKeyedArchiver archivedDataWithRootObject:[info mutableCopy]] toPeers:[array objectAtIndex:0] withMode:MCSessionSendDataUnreliable error: &error];
NSLog(@"localizedDescription %@",error);
@try {
if(_session && _session.connectedPeers && [_session.connectedPeers count] > 0) {
NSLog(@"%@",[song valueForProperty:MPMediaItemPropertyAssetURL]);
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:[song valueForProperty:MPMediaItemPropertyAssetURL] options:nil];
[self convertAsset: asset complition:^(BOOL Success, NSString *filePath) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
if(Success) {
if(image) {
[self saveImage: image withComplition:^(BOOL status, NSString *imageName, NSURL *imageURL) {
if(status) {
@try {
[_session sendResourceAtURL:imageURL withName:imageName toPeer:[_session.connectedPeers objectAtIndex:0]withCompletionHandler:^(NSError *error) {
if (error) {
NSLog(@"Failed to send picture to %@", error.localizedDescription);
return;
}
//Clean up the temp file
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager removeItemAtURL:imageURL error:nil];
}];
}
@catch (NSException *exception) {
}
}
}];
}
@try {
[self hideSpinner];
if(!self.outputStream) {
NSArray * connnectedPeers = [_session connectedPeers];
if([connnectedPeers count] != 0) {
[self outputStreamForPeer:[_session.connectedPeers objectAtIndex:0]];
}
}
}
@catch (NSException *exception) {
}
if(self.outputStream) {
self.outputStreamer = [[TDAudioOutputStreamer alloc] initWithOutputStream:self.outputStream];
//
[self.outputStreamer initStream:filePath];
NSLog(@"%@",filePath);
if(self.outputStreamer) {
[self.outputStreamer start];
}
else{
NSLog(@"Error: output streamer not found");
}
}
else{
//self.outputStream=[[NSOutputStream alloc] init];
self.outputStreamer = [[TDAudioOutputStreamer alloc] initWithOutputStream:self.outputStream];
[self.outputStreamer initStream:filePath];
NSLog(@"%@",filePath);
if(self.outputStreamer) {
[self.outputStreamer start];
}
}
}
else {
[UIView showMessageWithTitle:@"Error!" message:@"Error occured!" showInterval:1.5];
}
});
}];
// }
}
}
@catch (NSException *exception) {
NSLog(@"Expection: %@", [exception debugDescription]);
}
//}
}
主机视图控制器：
- (void)session:(MCSession *)session didReceiveData:(NSData *)data fromPeer:(MCPeerID *)peerID
{
NSLog(@"%@",peerID);
NSLog(@"sessions%@",session);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
@try {
// NSData *myData = [NSKeyedArchiver archivedDataWithRootObject:data];
info = [NSKeyedUnarchiver unarchiveObjectWithData:data];
self.songTitleLbl.text = [NSString stringWithFormat:@"%@ \n[Duration: %@] [Artist : %@] ", info[@"title"], info[@"duration"], info[@"artist"]];
NSLog(@"eeret%@",self.songTitleLbl.text);
self.songArtWorkImageView.image = nil;
[self showSpinner];
}
@catch (NSException *exception) {
self.songTitleLbl.text = @"Some error occured...\nPlease try again";
self.songArtWorkImageView.image = nil;
}
});
}
如果我在这里遗漏了什么或实现上述要求的更好方法，请告诉我们。任何帮助都非常感谢。