搜索多種類型與MPMediaPropertyPredicate

Question

我有以下幾點：

MPMediaPropertyPredicate *titlePredicate = [MPMediaPropertyPredicate predicateWithValue:textString 
                      forProperty:MPMediaItemPropertyTitle 
                     comparisonType:MPMediaPredicateComparisonContains]; 

NSSet *predicateSet = [NSSet setWithObject:titlePredicate]; 
MPMediaQuery *searchQuery = [[MPMediaQuery alloc] initWithFilterPredicates:predicateSet]; 
NSArray *itemsFromTextQuery = [searchQuery items]; 

for (MPMediaItem *song in itemsFromTextQuery) 
{ 
    [arrayOfSongItems addObject:song]; 
} 

偉大的工程，但只有搜索的曲目的標題。我希望它能返回標題，藝術家和專輯名稱的結果。

Answer 1

嘗試下面的代碼

MPMediaQuery* query = [MPMediaQuery albumsQuery]; 

[query addFilterPredicate:[MPMediaPropertyPredicate predicateWithValue:self.strArtist forProperty:MPMediaItemPropertyArtist]] 

[query addFilterPredicate:[MPMediaPropertyPredicate predicateWithValue:self.strTitle forProperty:MPMediaItemPropertyAlbumTitle]]; 

Answer 2

這個工作對我來說：

MPMediaQuery *searchQuery = [[MPMediaQuery alloc] init]; 
NSPredicate *test = [NSPredicate predicateWithFormat:@"title contains[cd] %@ OR albumTitle contains[cd] %@ OR artist contains[cd] %@", searchString, searchString, searchString]; 
NSArray *filteredArray = [[searchQuery items] filteredArrayUsingPredicate:test]; 

//NSLog(@"%@", [filteredArray valueForKeyPath:@"title"]); 

for (MPMediaItem *song in filteredArray) 
{ 
    [arrayOfSongItems addObject:song]; 
} 

我基本上後過濾正從媒體查詢的所有項目。我不認爲我的解決方案比首先過濾查詢更好，但絕對比單獨搜索三次更好。或者多次遍歷數組。