【发布时间】：2019-09-10 18:05:41
【问题描述】：
我的应用程序未正确显示我的数组中的所有项目。是什么导致这种情况发生？
var songamount = ["Refresh Page"]
var songImageAmount = [MPMediaItemArtwork]()
override func viewDidLoad() {
super.viewDidLoad()
MPMediaLibrary.requestAuthorization { (status) in
let myPlaylistQuery = MPMediaQuery.playlists()
let playlists = myPlaylistQuery.collections
self.songamount.remove(at: 0)
for playlist in playlists! {
print(playlist.value(forProperty: MPMediaPlaylistPropertyName)!)
let songs = playlist.items
for song in songs {
let songTitle = song.value(forProperty: MPMediaItemPropertyTitle)
let songImage = song.artwork
self.songamount.append(songTitle as! String)
self.songImageAmount.append(songImage!)
print("\t\t", songTitle!)
}
print(self.songamount)
print("Song Amount:\(self.songamount.count)")
print("Image Amount: \(self.songImageAmount.count)")
}
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return songamount.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "LibraryCell", for: indexPath) as! LibraryCell
cell.LibraryTitle.text = songamount[indexPath.row]
//cell.LibraryImage.image = songImageAmount[indexPath.row]
print(indexPath)
return cell
}
}
这是我的代码，用于显示用户 Itunes 库中的所有歌曲，但它仅显示 tableView 中数组中的 20 个项目。
更新-我已经让它正确地列出了我所有的歌曲，但它只在列表中显示了其中的 33 首。这是更新的代码
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var TextDebug: UILabel!
var songamount = ["Please Reload View"]
var songImageAmount = [MPMediaItemArtwork]()
override func viewDidLoad() {
super.viewDidLoad()
MPMediaLibrary.requestAuthorization { (status) in
let mySongQuery = MPMediaQuery.songs()
let songs = mySongQuery.collections
self.songamount.remove(at: 0)
for song in songs! {
print(MPMediaItemPropertyTitle)
let songs = song.items
for song in songs {
let songTitle = song.value(forProperty: MPMediaItemPropertyTitle)
//let songImage = song.artwork
self.songamount.append(songTitle as! String)
//self.songImageAmount.append(songImage!)
print("\t\t", songTitle!)
}
print(self.songamount)
print("Song Amount:\(self.songamount.count)")
//print("Image Amount: \(self.songImageAmount.count)")
}
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return songamount.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "LibraryCell", for: indexPath) as! LibraryCell
cell.LibraryTitle.text = songamount[indexPath.row]
//cell.LibraryImage.image = songImageAmount[indexPath.row]
let sections: Int = tableView.numberOfSections
var rows: Int = 0
for i in 0..<sections {
rows += tableView.numberOfRows(inSection: i)
TextDebug.text = "\(rows)"
}
return cell
}
【问题讨论】：
-
songamount.count返回什么？ -
@Koen 它返回 472，由于某种原因，这实际上超过了我库中的歌曲数量。我现在正在研究这个
-
确保在完成数据模型更新后重新加载表视图（在主队列上）。
-
并且你需要在
requestAuthorization完成块中检查status的值。仅当状态为.authorized时，您才应尝试访问歌曲。 -
@rmaddy 我已经在应用程序的早期部分运行了 .authorized 代码，除非授权访问，否则无法通过该代码
标签： ios swift media-player mpmedialibrary