搜索多种类型与MPMediaPropertyPredicate

Question

我有以下几点：

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]; 
} 

伟大的工程，但只有搜索的曲目的标题。我希望它能返回标题，艺术家和专辑名称的结果。

Answer 1

尝试下面的代码

MPMediaQuery* query = [MPMediaQuery albumsQuery]; 

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

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

Answer 2

这个工作对我来说：

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]; 
} 

我基本上后过滤正从媒体查询的所有项目。我不认为我的解决方案比首先过滤查询更好，但绝对比单独搜索三次更好。或者多次遍历数组。