[英]Replacement for MPMusicPlayerController iPodMusicPlayer in iOS 8
[英]MPMusicPlayerController and iOS 11.3
我有一個iOS應用程序,可以在iOS 6.0到11.2上正常運行,但是在11.3(.1)和11.4 beta上才開始失敗。 該應用程序從本地設備播放播放列表中的歌曲。 我已經為一個測試用例提取了應用程序的基本部分,但它以相同的方式失敗了。 難道我做錯了什么? 我正在使用XCode 7.3.1,並定位到iOS 6.0。 當失敗時,我會在日志中獲得唯一的消息(通過NSLog列出的歌曲除外,以下1行錯誤:libc ++ abi.dylib:終止於未捕獲的NSException類型異常。它在[musicPlayer播放中]失敗在playPlaylist例程中輸入以下命令:
#import "ViewController.h"
#import <MediaPlayer/MediaPlayer.h>
#define TESTMUSICPLAYER
MPMusicPlayerController *musicPlayer;
@interface ViewController ()
@property (strong, nonatomic) NSMutableArray *validPlayListArray;
@property (strong, nonatomic) NSString *musicPlaylist;
@property (strong, nonatomic) IBOutlet UIView *playlistsTableView;
@property (strong, nonatomic) NSMutableArray *playListArray;
@property NSInteger currentPlaylistIndex;
@property (strong, nonatomic) MPMediaQuery *musicPlaylistQuery;
@property (strong, nonatomic) NSArray *collections;
- (IBAction)stopButtonPressed:(id)sender;
@end
@implementation ViewController
@synthesize validPlayListArray;
@synthesize musicPlaylistQuery;
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [validPlayListArray count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 30.0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *musicCellIdentifier = @"MusicCell";
UITableViewCell *musicCell = [tableView dequeueReusableCellWithIdentifier:musicCellIdentifier];
if (musicCell == nil)
{
musicCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:musicCellIdentifier];
musicCell.selectionStyle = UITableViewCellSelectionStyleGray;
}
musicCell.textLabel.text = [validPlayListArray objectAtIndex:indexPath.row];
return musicCell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
_musicPlaylist = [validPlayListArray objectAtIndex:indexPath.row];
[self playMusic];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self loadThePlaylistArrays];
}
- (void)loadThePlaylistArrays
{
// Clear the valid playlist array
validPlayListArray = nil;
// Allocate our arrays
validPlayListArray = [[NSMutableArray alloc] init];
MPMediaPropertyPredicate *playlistName;
MPMediaQuery *playlistsQuery = [MPMediaQuery playlistsQuery];
_playListArray = (NSMutableArray*)[playlistsQuery collections];
// Set the currentPlaylistIndex to -1 in case there are no matches
_currentPlaylistIndex = -1;
int validCount = 0;
for (int i = 0; i < [_playListArray count]; ++i)
{
NSString *stringplaylistName = [[_playListArray objectAtIndex:i] valueForProperty:MPMediaPlaylistPropertyName];
playlistName = [MPMediaPropertyPredicate predicateWithValue:stringplaylistName forProperty:MPMediaPlaylistPropertyName];
musicPlaylistQuery = [MPMediaQuery playlistsQuery];
[musicPlaylistQuery addFilterPredicate:playlistName];
_collections = [musicPlaylistQuery items];
if ([_collections count] > 0)
{
//NSLog(@"Playlist: %@ Item count: %d", stringplaylistName, [_collections count]);
if (validCount > 0)
{
if (![stringplaylistName isEqualToString:[validPlayListArray objectAtIndex:validCount - 1]])
{
if (![stringplaylistName isEqualToString:@""])
{
[validPlayListArray addObject:stringplaylistName];
if ([_musicPlaylist isEqualToString:stringplaylistName])
{
_currentPlaylistIndex = validCount;
}
validCount ++;
}
}
}
else
{
if (![stringplaylistName isEqualToString:@""])
{
[validPlayListArray addObject:stringplaylistName];
if ([_musicPlaylist isEqualToString:stringplaylistName])
{
_currentPlaylistIndex = validCount;
}
validCount ++;
}
}
}
}
}
- (void)playMusic
{
MPMediaPropertyPredicate *playlistName;
[self initializeMusicPlayer];
playlistName = [MPMediaPropertyPredicate predicateWithValue:_musicPlaylist forProperty:MPMediaPlaylistPropertyName];
musicPlaylistQuery = [MPMediaQuery playlistsQuery];
[musicPlaylistQuery addFilterPredicate:playlistName];
_collections = [musicPlaylistQuery items];
#ifdef TESTMUSICPLAYER
for (MPMediaItem *song in _collections)
{
NSString* songTitle = [song valueForProperty:MPMediaItemPropertyTitle];
NSLog(@"%@", songTitle);
}
#endif
if ([_collections count] > 0)
{
[self playPlaylist];
}
}
- (void)initializeMusicPlayer
{
musicPlayer = [MPMusicPlayerController applicationMusicPlayer];
[musicPlayer setShuffleMode:MPMusicShuffleModeOff];
[musicPlayer setRepeatMode:MPMusicRepeatModeAll];
}
- (void)playPlaylist
{
[musicPlayer setQueueWithItemCollection:(MPMediaItemCollection *)musicPlaylistQuery];
[musicPlayer play];
}
- (IBAction)stopButtonPressed:(id)sender
{
[musicPlayer stop];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
用戶界面非常簡單-1個UITableView(playlistsTableView)和1個“停止”按鈕。
你為什么不使用
[musicPlayer setQueueWithQuery:musicPlaylistQuery];
->好吧
代替
[musicPlayer setQueueWithItemCollection:(MPMediaItemCollection *)musicPlaylistQuery];
->失敗
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