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Use MusicBrainz in iOS(三)查询专辑的完整信息
本文讨论下通过专辑名获取专辑的完整信息。包含歌曲列表。艺术家列表,发行时间和地区等。
因为是通过专辑名搜索专辑信息。所以搜索出来的结果可能较多,比如一个“Violin Concertos”就可能包括多个搜索结果,而本文仅仅是显示专辑的完整信息,并不进行进一步的匹配工作,因此以第一个搜索结果为例。
代码例如以下:
#import "AlbumViewController.h" #import "MB.h" #import "ResultViewController.h" #define UnknownString @"未知" #define UnknownInteger 0 @interface AlbumViewController () @property (strong, nonatomic) ResultViewController *resultController; @property (copy, nonatomic) RequestFailureBlock failureBlock; @end @implementation AlbumViewController @synthesize resultController = _resultController; - (void)viewDidLoad { [super viewDidLoad]; self.resultController = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ResultViewController"]; self.failureBlock = ^(MBRequest *request, NSError *error, NSData *data) { NSString *message = [NSString stringWithFormat:@"错误:%@", [error localizedDescription]]; UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"警告" message:message delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [alertView show]; }; } - (void)alertWithMessage:(NSString *)message { UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"警告" message:message delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [alertView show]; } - (IBAction)search:(id)sender { MBConnection *conn = [MBConnection connection]; RequestSuccessBlock successBlock = ^(MBRequest *request, MBMetadata *metadata) { MBList *list = metadata.ReleaseList; MBRelease *release = [list elementAtIndex:0]; // 专辑的mbid _resultController.mbid = (release.Id) ? release.Id : UnknownString; if (!release.Id) { [self alertWithMessage:@"搜索失败"]; return; } // 专辑名 _resultController.title = (release.Title) ? release.Title : UnknownString; // 专辑状态 _resultController.status = (release.Status) ? release.Status : UnknownString; // 专辑音质 _resultController.quality = (release.Quality) ? release.Quality : UnknownString; MBTextRepresentation *textRepresentation = release.TextRepresentation; // 专辑语言 _resultController.language = (textRepresentation.Language) ? textRepresentation.Language : UnknownString; // 专辑剧本语言 _resultController.script = (textRepresentation.Script) ? textRepresentation.Script : UnknownString; MBArtistCredit *artistCredit = release.ArtistCredit; NSUInteger nameCount = (artistCredit.elementCount) ? artistCredit.elementCount : UnknownInteger; // 专辑艺术家列表 _resultController.artists = [NSMutableArray array]; for (int i = 0; i < nameCount; i++) { MBNameCredit *nameCredit = [artistCredit elementAtIndex:i]; [_resultController.artists addObject:nameCredit.Artist.Name]; } MBReleaseGroup *group = release.ReleaseGroup; NSLog(@"发行组织类型 = %@", group.Type); NSLog(@"发行组织名称 = %@", group.Title); // 专辑发行日期 _resultController.date = (release.Date) ? release.Date : UnknownString; // 专辑发行国家 _resultController.country = (release.Country) ? release.Country : UnknownString; NSLog(@"专辑条形码 = %@", release.Barcode); NSLog(@"Asin 标准识别码,来自卓越亚马逊 = %@", release.Asin); MBList *mediumList = release.MediumList; MBMedium *medium = [mediumList elementAtIndex:1]; // 专辑发行形式 _resultController.format = medium.Format; NSLog(@"专辑中的音乐个数 = %d", medium.TrackList.Count.integerValue); // 用一个列表显示出专辑的具体信息 [self showAllData:release.Id]; }; MBRequest *req = [MBRequest searchForEntity:MBEntityRelease query:@"Violin Concertos" // query:@"不想放手" limit:[NSNumber numberWithInteger:10] offset:[NSNumber numberWithInteger:0]]; [conn enqueueRequest:req onSuccess:successBlock onFailure:self.failureBlock]; } - (void)showAllData:(NSString *)mbid { MBConnection *conn = [MBConnection connection]; MBRequest *req = [MBRequest lookupWithEntity:MBEntityRelease mbid:mbid incParameters:(MBIncParameterRecordings | MBIncParameterRecordingRels)]; void (^successBlock)(MBRequest *, MBMetadata *) = ^(MBRequest *request, MBMetadata *metadata) { MBRelease *release = metadata.Release; if (release) { _resultController.tracks = [NSMutableArray array]; MBList *mediumList = release.MediumList; MBMedium *medium = [mediumList elementAtIndex:0]; MBList *trackList = medium.TrackList; for (MBTrack *track in trackList) { [_resultController.tracks addObject:track.Recording.Title]; } [self.navigationController pushViewController:_resultController animated:YES]; NSLog(@"Success"); } else { [self alertWithMessage:@"搜索失败"]; } }; [conn enqueueRequest:req onSuccess:successBlock onFailure:self.failureBlock]; } @end
其实,这和Use MusicBrainz in iOS(二)中的搜索方法是一样的。仅仅是搜索的类型是MBEntityRelease。在搜索并获取到列表中的第一个结果后,我们选取其mbid进行进一步的查询,由于仅仅有通过mbid的查询才干查找到该专辑中包括什么歌曲等信息。
在查询成功后。用一个表格来载入这些数据。ResultViewController类代码例如以下:
#import <UIKit/UIKit.h> @interface ResultViewController : UITableViewController @property (strong, nonatomic) NSMutableArray *tracks; @property (strong, nonatomic) NSMutableArray *artists; @property (copy, nonatomic) NSString *title; @property (copy, nonatomic) NSString *mbid; @property (copy, nonatomic) NSString *date; @property (copy, nonatomic) NSString *country; @property (copy, nonatomic) NSString *format; @property (copy, nonatomic) NSString *language; @property (copy, nonatomic) NSString *script; @property (copy, nonatomic) NSString *quality; @property (copy, nonatomic) NSString *status; @end
#import "ResultViewController.h" @interface ResultViewController () @end @implementation ResultViewController - (void)viewDidLoad { [super viewDidLoad]; } - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; self.navigationItem.title = self.title; } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 4; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { switch (section) { case 0: return [self.tracks count]; case 1: return [self.artists count]; case 2: return 5; case 3: return 2; default: return 0; } } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { switch (section) { case 0: return @"音乐列表"; case 1: return @"艺术家"; case 2: return @"基本信息"; case 3: return @"附加信息"; default: return @""; } } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellIdentifier" forIndexPath:indexPath]; if (indexPath.section == 0) { cell.textLabel.text = self.tracks[indexPath.row]; } else if (indexPath.section == 1) { cell.textLabel.text = self.artists[indexPath.row]; } else if (indexPath.section == 2) { NSString *text; switch (indexPath.row) { case 0: text = [NSString stringWithFormat:@"发行日期:%@", self.date]; break; case 1: text = [NSString stringWithFormat:@"发行地区:%@", self.country]; break; case 2: text = [NSString stringWithFormat:@"发行形式:%@", self.format]; break; case 3: text = [NSString stringWithFormat:@"语言:%@", self.language]; break; case 4: text = [NSString stringWithFormat:@"Script:%@", self.script]; break; default: break; } cell.textLabel.text = text; } else if (indexPath.section == 3) { NSString *text; switch (indexPath.row) { case 0: text = [NSString stringWithFormat:@"品质:%@", self.quality]; break; case 1: text = [NSString stringWithFormat:@"状态:%@", self.status]; break; default: break; } cell.textLabel.text = text; } return cell; } @end
执行结果例如以下:
程序可能会继续改动,看看明天有什么进一步的需求提出来吧。
Use MusicBrainz in iOS(三)查询专辑的完整信息
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