我试图在播放器（缓冲或加载）以及开始播放时ActivityIndicator显示ActivityIndicator停止ActivityIndicator。此外，当我停止播放器时，AVPlayer的（removeObserver或deallocObservers）。
当我播放音乐时，它会显示var selectIndex:Int = -1
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell{
let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! RadioCollectionViewCell
cell.backgroundColor = UIColor.yellowColor()
let object = objects[indexPath.row]
cell.img.image = UIImage(named: object["image"]!)
cell.btnPlay.addTarget(self, action: Selector("audioControlButtonAction:"), forControlEvents: UIControlEvents.TouchUpInside)
cell.btnPlay.tag = indexPath.row+1
return cell
}
func audioControlButtonAction(sender: UIButton){
if player != nil && player?.currentItem != nil {
deallocObservers(player!)
}
var btn:NSInteger
btn = sender.tag as NSInteger
let object = objects[btn-1]
let nurl = NSURL(string: "\(object["url"]!)")!
playerItem = AVPlayerItem(URL: nurl)
player=AVPlayer(playerItem: playerItem!)
print(selectIndex)
if selectIndex != -1 && selectIndex != sender.tag
{
let bt:UIButton = self.view.viewWithTag(selectIndex) as! UIButton
if bt.selected == true
{
bt.selected = false
deallocObservers(player!)
}
}
if sender.selected == false
{
player!.addObserver(self, forKeyPath: "status", options:NSKeyValueObservingOptions(), context: nil)
player!.addObserver(self, forKeyPath: "playbackBufferEmpty", options:NSKeyValueObservingOptions(), context: nil)
// player!.addObserver(self, forKeyPath: "playbackLikelyToKeepUp", options:NSKeyValueObservingOptions(), context: nil)
player!.addObserver(self, forKeyPath: "loadedTimeRanges", options: NSKeyValueObservingOptions(), context: nil)
player!.play()
sender.selected = true
selectIndex = sender.tag
activityView.startAnimating()
// self.view.userInteractionEnabled = false
}
else
{
deallocObservers(player!)
player?.pause()
sender.selected = false
selectIndex = -1
}
print(selectIndex)
}
func deallocObservers(player: AVPlayer) {
player.removeObserver(self, forKeyPath: "status")
player.removeObserver(self, forKeyPath: "playbackBufferEmpty")
// player.removeObserver(self, forKeyPath: "playbackLikelyToKeepUp")
player.removeObserver(self, forKeyPath: "loadedTimeRanges")
}
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>){
if object?.isEqual(player) == true && keyPath == "status" {
print("status")
if player?.status == AVPlayerStatus.ReadyToPlay{
print("AVPlayerStatus.ReadyToPlay")
activityView.stopAnimating()
// self.view.userInteractionEnabled = true
}else{
print("AVPlayerStatus.NotReadyToPlay")
activityView.startAnimating()
// self.view.userInteractionEnabled = false
}
//if keyPath == "playbackLikelyToKeepUp" {
//activityView.stopAnimating()
////self.view.userInteractionEnabled = true
//print("playbackLikelyToKeepUp")
//}
if keyPath == "playbackBufferEmpty" {
activityView.startAnimating()
self.view.userInteractionEnabled = false
let createAccountErrorAlert: UIAlertView = UIAlertView()
createAccountErrorAlert.delegate = self
createAccountErrorAlert.title = "No Internet Connection"
createAccountErrorAlert.message = "Make sure your device is connected to the internet."
createAccountErrorAlert.addButtonWithTitle("Dismiss")
createAccountErrorAlert.show()
print("playbackBufferEmpty")
}
if player?.status == AVPlayerStatus.Failed{
print("Something went wrong . player.error should contain some information")
}
}
}
，直到它准备好播放，但它会在播放前4,5秒停止播放ActivityIndicator。问题是，当我停止AVPlayer或点击另一个播放按钮时，它会在删除AVPlayer观察者时出错。
任何人都可以告诉我我的代码中的错误在哪里以及如何解决它感谢。
-1
1
status
AVPlayerStatus.ReadyToPlay
1
2016-07-24 21:51:00.585 Radio[777:23560] *** Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <Radio.RadioCollectionViewController 0x7fbe39d47f70> for the key path "status" from <AVPlayer 0x7fbe39e67410> because it is not registered as an observer.'
*** First throw call stack:
(
0 CoreFoundation 0x00000001019b2e65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000103b51deb objc_exception_throw + 48
2 CoreFoundation 0x00000001019b2d9d +[NSException raise:format:] + 205
3 Foundation 0x0000000101fc4d51 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] + 504
4 Foundation 0x0000000101fc4abd -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] + 84
5 Radio 0x00000001014a935d _TFC5Radio29RadioCollectionViewController16deallocObserversfS0_FCSo8AVPlayerT_ + 141
6 Radio 0x00000001014a8fbe _TFC5Radio29RadioCollectionViewController24audioControlButtonActionfS0_FCSo8UIButtonT_ + 5326
7 Radio 0x00000001014a92ba _TToFC5Radio29RadioCollectionViewController24audioControlButtonActionfS0_FCSo8UIButtonT_ + 58
8 UIKit 0x0000000102630194 -[UIApplication sendAction:to:from:forEvent:] + 92
9 UIKit 0x000000010279f6fc -[UIControl sendAction:to:forEvent:] + 67
10 UIKit 0x000000010279f9c8 -[UIControl _sendActionsForEvents:withEvent:] + 311
11 UIKit 0x000000010279eaf8 -[UIControl touchesEnded:withEvent:] + 601
12 UIKit 0x000000010269f49b -[UIWindow _sendTouchesForEvent:] + 835
13 UIKit 0x00000001026a01d0 -[UIWindow sendEvent:] + 865
14 UIKit 0x000000010264eb66 -[UIApplication sendEvent:] + 263
15 UIKit 0x0000000102628d97 _UIApplicationHandleEventQueue + 6844
16 CoreFoundation 0x00000001018dea31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
17 CoreFoundation 0x00000001018d495c __CFRunLoopDoSources0 + 556
18 CoreFoundation 0x00000001018d3e13 __CFRunLoopRun + 867
19 CoreFoundation 0x00000001018d3828 CFRunLoopRunSpecific + 488
20 GraphicsServices 0x0000000106247ad2 GSEventRunModal + 161
21 UIKit 0x000000010262e610 UIApplicationMain + 171
22 Radio 0x00000001014afd5d main + 109
23 libdyld.dylib 0x000000010468892d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
输出
status observer我找到了从此链接中删除@try { [player removeObserver:self forKeyPath:@"status"]; } @catch (NSException *exception) { } @finally { } –
的解决方案，但我不知道如何在swift中转换它。
解决方案
Private Sub txtFilter_AfterUpdate()
Dim strFilter As String
Dim strWildcard As String
If Len(Trim(Me.txtfilter.Value & vbNullString)) > 0 Then
strWildcard = " Like '*" & Replace(Me.txtfilter.Value, "'", "''") & "*'"
strFilter = "orderstatus" & strWildcard & " And ordersales" & strWildcard
Me.Filter = strFilter
Me.FilterOn = True
Else
Me.FilterOn = False
End If
End Sub
答案 0 :(得分：1)
问题在于＆＃34; deallocObservers＆＃34;方法被调用两次而不在这两个调用之间添加任何观察者。我想曾经在这里：
if player != nil && player?.currentItem != nil {
deallocObservers(player!)
}
第二次调用此方法时，播放器变量和当前项目不会为空。第二次调用deallocObservers可能就在这里：
if bt.selected == true
{
bt.selected = false
deallocObservers(player!)
}
我会在deallocObservers方法中放置一个断点，以查看调用此方法的次数以及调用它的方式（查看堆栈跟踪）。
答案 1 :(得分：1)
的快速版本
目标C
@try { [player removeObserver:self forKeyPath:@"status"]; } @catch (NSException *exception) { } @finally { }
<强>夫特
do {
try player.removeObserver(self, forKeyPath: "status")
}
catch {
print("error")
}
defer{
print("finally statement here")
}
答案 2 :(得分：0)
我添加了对这些条件的检查。
var check = true
func audioControlButtonAction(sender: UIButton){
if check == false {
deallocObservers(player!)
}
if sender.selected == false{
check = false
}
else{
check = true
}
}