我有以下加载视频并循环播放的代码。但是，当按下主页并返回到应用程序时，视频会卡住并且不会再次播放。我觉得答案在 AppDelegate 函数中，但似乎无法让它们工作。
import UIKit
import AVKit
import AVFoundation
class ViewController: UIViewController, UIApplicationDelegate {
var videoPlayer: AVPlayer!
var playerLayer: AVPlayerLayer?
override func viewDidLoad() {
super.viewDidLoad()
let path = NSBundle.mainBundle().pathForResource("video", ofType:"mp4")
let url = NSURL(fileURLWithPath: path!)
let playerItem = AVPlayerItem(URL: url)
self.videoPlayer = AVPlayer(playerItem: playerItem)
self.playerLayer = AVPlayerLayer(player: self.videoPlayer)
self.playerLayer!.frame = self.view.frame
self.videoPlayer!.play()
self.view.layer.addSublayer(self.playerLayer!)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("playerDidReachEnd:"), name: AVPlayerItemDidPlayToEndTimeNotification, object:nil)
}
func playerDidReachEnd(notification: NSNotification) {
self.videoPlayer.seekToTime(kCMTimeZero)
self.videoPlayer.play()
}
func applicationWillResignActive(application: UIApplication) {
videoPlayer.pause()
}
func applicationDidBecomeActive(application: UIApplication) {
videoPlayer.play()
}
func applicationDidEnterBackground(application: UIApplication) {
videoPlayer.pause()
}
func applicationWillEnterForeground(application: UIApplication) {
videoPlayer.play()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
这是我用来修复它的方法。
import UIKit
import AVKit
import AVFoundation
class ViewController: UIViewController, UIApplicationDelegate {
var videoPlayer: AVPlayer!
var playerLayer: AVPlayerLayer?
override func viewDidLoad() {
super.viewDidLoad()
let path = NSBundle.mainBundle().pathForResource("video", ofType:"mp4")
let url = NSURL(fileURLWithPath: path!)
let playerItem = AVPlayerItem(URL: url)
self.videoPlayer = AVPlayer(playerItem: playerItem)
self.playerLayer = AVPlayerLayer(player: self.videoPlayer)
self.playerLayer!.frame = self.view.frame
self.videoPlayer!.play()
self.view.layer.addSublayer(self.playerLayer!)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("continueVideo:"), name: "continueVideo", object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("playerDidReachEnd:"), name: AVPlayerItemDidPlayToEndTimeNotification, object:nil)
}
func playerDidReachEnd(notification: NSNotification) {
self.videoPlayer.seekToTime(kCMTimeZero)
self.videoPlayer.play()
}
func continueVideo(notification: NSNotification) {
self.videoPlayer.play()
}
func applicationWillResignActive(application: UIApplication) {
videoPlayer.pause()
}
func applicationDidBecomeActive(application: UIApplication) {
videoPlayer.play()
}
func applicationDidEnterBackground(application: UIApplication) {
videoPlayer.pause()
}
func applicationWillEnterForeground(application: UIApplication) {
videoPlayer.play()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
和应用委托(delegate)部分
import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
return true
}
func applicationWillResignActive(application: UIApplication) {
}
func applicationDidEnterBackground(application: UIApplication) {
}
func applicationWillEnterForeground(application: UIApplication) {
NSNotificationCenter.defaultCenter().postNotificationName ("continueVideo", object:nil)
}
func applicationDidBecomeActive(application: UIApplication) {
}
func applicationWillTerminate(application: UIApplication) {
}
}
最佳答案
这是一个简单的修复，您需要创建一个 NSNotification 并从您的 AppDelegate 调用它:
func applicationWillEnterForeground(application: UIApplication) {
NSNotificationCenter.defaultCenter().postNotificationName("continueVideo", object: nil)
}
SWIFT3 更新
func applicationWillEnterForeground(_ application: UIApplication) {
// NOTE: Notification.Name raw value should be global
NotificationCenter.default.post(name: Notification.Name(rawValue: "com.yourappname.continueVideo"), object:self)
}
然后以正常方式接收该通知:
NSNotificationCenter.defaultCenter().addObserver(self, selector: "<funcName>:", name: "continueVideo", object: nil)
SWIFT3 更新
NotificationCenter.default.addObserver(self, selector: #selector(<funcName>), name: Notification.Name(rawValue: "com.yourappname.continueVideo"), object: nil)
关于xcode - AVPlayer 一旦移动到背景就卡住，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33667226/