我到处寻找解决方案。写这个问题只是想再次碰碰运气。我有一个 collectionViewCell,其中我解析了包含名称和 ID 的 XML URL 数据。现在,当我点击单元格时,我想加载一个带有 AVPlayer 的 UIView。要播放该文件,我必须使用不同的 URL,但使用我在该单元格中解析的 id。这是我的 didSelectItem 函数
:
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let playerLauncher = PlayerLauncher()
playerLauncher.showPlayer()
}
这是我的 PlayerLauncher 文件:
import UIKit
import AVFoundation
class PlayerView: UIView {
var item: Item?
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = UIColor.black
let id = item?.itemId
if let url = URL(string: "http://xample.com/play.m3u?id=\(id)") {
let player = AVPlayer(url: url)
print(url)
let playerLayer = AVPlayerLayer(player: player)
self.layer.addSublayer(playerLayer)
playerLayer.frame = self.frame
player.play()
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class PlayerLauncher: NSObject {
func showPlayer() {
if let keyWindow = UIApplication.shared.keyWindow {
let view = UIView(frame: keyWindow.frame)
view.backgroundColor = UIColor.white
view.frame = CGRect(x: 0, y: keyWindow.frame.height - 50, width: view.frame.width, height: 50)
let playerFrame = CGRect(x: 0, y: 0, width: keyWindow.frame.width, height: keyWindow.frame.height)
let playerView = PlayerView(frame: playerFrame)
view.addSubview(playerView)
keyWindow.addSubview(view)
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
view.frame = keyWindow.frame
}, completion: nil)
}
}
}
我已经从我的 Item NSObject 类中设置了该项目,但在选择单元格后,UIView 加载正常,但不播放文件并显示 id = nil 。我该如何修复它?
更新:所以我稍微更改了代码,我可以打印 id。
以下是我在 didSelectItem
方法中所做的更改:
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
collectionView.deselectItem(at: indexPath, animated: true)
let playerView = PlayerView()
playerView.item = items?[indexPath.item]
let playerLauncher = PlayerLauncher()
playerLauncher.showPlayer()
}
之后我更改了 PlayerView 和 PlayerLauncher 类中的一些代码:
import UIKit
import AVFoundation
class PlayerView: UIView {
var id: String?
var item: Item? {
didSet {
id = item?.itemId
print(id)
}
}
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = UIColor.black
}
func startPlaying() {
if let url = URL(string: "http://xample.com/play.m3u?id=\(id)") {
let player = AVPlayer(url: url)
print(url)
let playerLayer = AVPlayerLayer(player: player)
self.layer.addSublayer(playerLayer)
playerLayer.frame = self.frame
player.play()
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class PlayerLauncher: NSObject {
func showPlayer() {
if let keyWindow = UIApplication.shared.keyWindow {
let view = UIView(frame: keyWindow.frame)
view.backgroundColor = UIColor.white
view.frame = CGRect(x: 0, y: keyWindow.frame.height - 50, width: view.frame.width, height: 50)
let playerFrame = CGRect(x: 0, y: 0, width: keyWindow.frame.width, height: keyWindow.frame.height)
let playerView = PlayerView(frame: playerFrame)
view.addSubview(playerView)
keyWindow.addSubview(view)
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
view.frame = keyWindow.frame
}, completion: { (completeAnimation) in
playerView.startPlaying()
})
}
}
}
现在我可以从 didSet
打印 id,但是在 startPlaying()
方法中,当我选择该项目时,它仍然显示 id = nil
。如何获取 init
或 startPlaying()
func 中 didSet
中设置的属性?
最佳答案
您可能希望在选择单元格时检索Item
信息。
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let item: Item = itemList[indexPath.item] // just for instance
let playerLauncher = PlayerLauncher()
playerLauncher.showPlayer(item)
}
因此您需要更改您的Player
,如下所示:
class PlayerLauncher: NSObject {
func showPlayer(item: Item) {
if let keyWindow = UIApplication.shared.keyWindow {
let view = UIView(frame: keyWindow.frame)
view.backgroundColor = UIColor.white
view.frame = CGRect(x: 0, y: keyWindow.frame.height - 50, width: view.frame.width, height: 50)
let playerFrame = CGRect(x: 0, y: 0, width: keyWindow.frame.width, height: keyWindow.frame.height)
let playerView = PlayerView(frame: playerFrame)
playerView.item = item // Here
view.addSubview(playerView)
keyWindow.addSubview(view)
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
view.frame = keyWindow.frame
}, completion: { _ in
playerView.startPlaying() // And here
})
}
}
}
在PlayerView
中:
class PlayerView: UIView {
var item: Item?
var player: AVPlayer?
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = UIColor.black
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func startPlaying() {
let id = item?.itemId
if let url = URL(string: "http://xample.com/play.m3u?id=\(id)") {
self.player = AVPlayer(url: url)
print(url)
let playerLayer = AVPlayerLayer(player: self.player)
self.layer.addSublayer(playerLayer)
playerLayer.frame = self.frame
self.player.play()
}
}
}
更新:
尝试一下,看看会发生什么:
func startPlaying() {
guard let id = id else { print("** id is nil"); return } // here
print("* item id = \(id)") // and here
if let url = URL(string: "http://xample.com/play.m3u?id=\(id)") {
let player = AVPlayer(url: url)
print(url)
let playerLayer = AVPlayerLayer(player: player)
self.layer.addSublayer(playerLayer)
playerLayer.frame = self.frame
player.play()
}
}
更新#2:
再次,整个代码:
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let item = items?[indexPath.item]
let playerLauncher = PlayerLauncher()
playerLauncher.showPlayer(item)
}
和:
class PlayerLauncher: NSObject {
func showPlayer(item: Item) {
if let keyWindow = UIApplication.shared.keyWindow {
let view = UIView(frame: keyWindow.frame)
view.backgroundColor = UIColor.white
view.frame = CGRect(x: 0, y: keyWindow.frame.height - 50, width: view.frame.width, height: 50)
let playerFrame = CGRect(x: 0, y: 0, width: keyWindow.frame.width, height: keyWindow.frame.height)
let playerView = PlayerView(frame: playerFrame)
playerView.item = item // Here
view.addSubview(playerView)
keyWindow.addSubview(view)
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
view.frame = keyWindow.frame
}, completion: { _ in
playerView.startPlaying() // And here
})
}
}
}
class PlayerView: UIView {
var id: String?
var item: Item? {
didSet {
id = item?.itemId
print(id)
}
}
var player: AVPlayer?
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = UIColor.black
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func startPlaying() {
guard let id = id else { print("** id is nil"); return } // here
print("* item id = \(id)") // and here
if let url = URL(string: "http://xample.com/play.m3u?id=\(id)") {
self.player = AVPlayer(url: url)
print(url)
let playerLayer = AVPlayerLayer(player: self.player)
self.layer.addSublayer(playerLayer)
playerLayer.frame = self.frame
self.player.play()
}
}
}
关于xml - 无法加载带有 UICollectionVIewCell 数据的 UIView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45943797/