[英]Swift Printing out genres in personal medial library
我正在嘗試打印出我個人圖書館中的流派列表。 我遇到了一個大問題,我無法獲得這些類型的實際名稱。
我的代碼是:
// Initialization:
let query = MPMediaQuery()
let result = query.items
print("count: \(result?.count)") //This returns the amount of items in my library
現在這里是問題所在:
query.groupingType = MPMediaGrouping.genre
var genreArray = query.collections
print(genreArray)
當我去打印它時,它給了我一個MPConcreteMediaItemCollection
項目的列表, MPConcreteMediaItemCollection
包含以下十六進制:
<MPConcreteMediaItemCollection: 0x1c00cbf30>, <MPConcreteMediaItemCollection: 0x1c00cbfa0>, <MPConcreteMediaItemCollection: 0x1c00cc010>, <MPConcreteMediaItemCollection: 0x1c00cc080>, <MPConcreteMediaItemCollection: 0x1c00cc0f0>, <MPConcreteMediaItemCollection: 0x1c00cc160>, <MPConcreteMediaItemCollection: 0x1c00cc1d0>, <MPConcreteMediaItemCollection: 0x1c00cc240>, <MPConcreteMediaItemCollection: 0x1c00cc2b0>, <MPConcreteMediaItemCollection: 0x1c00cc320>, <MPConcreteMediaItemCollection: 0x1c00cc390>, <MPConcreteMediaItemCollection: 0x1c00cc400>, <MPConcreteMediaItemCollection: 0x1c00cc470>, <MPConcreteMediaItemCollection: 0x1c00cc4e0>, <MPConcreteMediaItemCollection: 0x1c00cc550>, <MPConcreteMediaItemCollection: 0x1c00cc5c0>, <MPConcreteMediaItemCollection: 0x1c00cc630>, <MPConcreteMediaItemCollection: 0x1c00cc6a0>, <MPConcreteMediaItemCollection: 0x1c00cc710>, <MPConcreteMediaItemCollection: 0x1c00cc780>, <MPConcreteMediaItemCollection: 0x1c00cc7f0>, <MPConcreteMediaItemCollection: 0x1c00cc860>, <MPConcreteMediaItemCollection: 0x1c00cc8d0>, <MPConcreteMediaItemCollection: 0x1c00cc940>, <MPConcreteMediaItemCollection: 0x1c00cc9b0>, <MPConcreteMediaItemCollection: 0x1c00cca20>, <MPConcreteMediaItemCollection: 0x1c00cca90>, <MPConcreteMediaItemCollection: 0x1c00ccb00>, <MPConcreteMediaItemCollection: 0x1c00ccb70>, <MPConcreteMediaItemCollection: 0x1c00ccbe0>, <MPConcreteMediaItemCollection: 0x1c00ccc50>, <MPConcreteMediaItemCollection: 0x1c00cccc0>, <MPConcreteMediaItemCollection: 0x1c00ccd30>, <MPConcreteMediaItemCollection: 0x1c00ccda0>, <MPConcreteMediaItemCollection: 0x1c00cce10>, <MPConcreteMediaItemCollection: 0x1c00cce80>, <MPConcreteMediaItemCollection: 0x1c00ccef0>, <MPConcreteMediaItemCollection: 0x1c00ccf60>, <MPConcreteMediaItemCollection: 0x1c00ccfd0>, <MPConcreteMediaItemCollection: 0x1c00cd040>, <MPConcreteMediaItemCollection: 0x1c00cd0b0>])
我如何讓這些值等同於實際的流派名稱?
這是MPMediaItemCollection
的文檔,它是存儲在query.collections
的對象。
每個MPMediaItemCollection
都有一個items
屬性,它是一個MPMediaItem
數組。 每個MPMedaItem
都有一個genre
屬性,這就是您要查找的內容。
如果您查詢的謂詞是按流派分類的,那么您可以說:
for collection in query.collections {
let genre = collection.representativeItem?.genre
// ...
}
否則,您將不得不遍歷每個項目:
for collection in query.collections {
for item in collection.items {
let genre = item.genre
// ...
}
}
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