獲得CocoaLibSpotify錯誤SPPlaylist.m

Question

當我嘗試建立我的項目，我得到的線827 /PATH_TO_PROJECT/Libs/CocoaLibSpotify/Model/SPPlaylist.m:827:25: Implicit conversion of Objective-C pointer type 'AVAssetTrack *' to C pointer type 'sp_track *' (aka 'struct sp_track *') requires a bridged cast

這裏下面的錯誤是發生錯誤代碼：

805 -(void)addItems:(NSArray *)newItems atIndex:(NSUInteger)index callback:(SPErrorableOperationCallback)block { 
806  
807  SPDispatchAsync(^{ 
808   
809   if (newItems.count == 0) { 
810    dispatch_async(dispatch_get_main_queue(), ^{ 
811     if (block) block([NSError spotifyErrorWithCode:SP_ERROR_INVALID_INDATA]); 
812    }); 
813    return; 
814   } 
815   
816   sp_track **tracks = malloc(sizeof(sp_track *) * newItems.count); 
817   
818   // libSpotify iterates through the array and inserts each track at the given index, 
819   // which ends up reversing the expected order. Defeat this by constructing a backwards 
820   // array. 
821   for (int currentTrack = (int)newItems.count - 1; currentTrack >= 0; currentTrack--) { 
822    
823    sp_track *track; 
824    id item = [newItems objectAtIndex:currentTrack]; 
825    
826    if ([item isKindOfClass:[SPTrack class]]) 
827     track = [item track]; 
828    else 
829     track = [(SPTrack *)((SPPlaylistItem *)item).item track]; 
830    
831    tracks[currentTrack] = track; 
832   } 
833   sp_track *const *trackPointer = tracks; 
834   
835   if (block) 
836    [self.addCallbackStack addObject:block]; 
837   
838   sp_error errorCode = sp_playlist_add_tracks(self.playlist, trackPointer, (int)newItems.count, (int)index, self.session.session); 
839   free(tracks); 
840   tracks = NULL; 
841   
842   NSError *error = nil; 
843   if (errorCode != SP_ERROR_OK) 
844    error = [NSError spotifyErrorWithCode:errorCode]; 
845   
846   if (error && block) { 
847    [self.addCallbackStack removeObject:block]; 
848    dispatch_async(dispatch_get_main_queue(), ^{ block(error); }); 
849   } 
850  }); 
851 } 

謝謝您的幫助！

Answer 1

錯誤是不言自明的 - 你需要做一個橋接模型。

track = (__bridge sp_track *)[item track]; 

或

track = [(SPPlaylistItem *)item track];