@class PlayerViewController; 
  @property(nonatomic)float volumeDelegate;@H_404_4@ 
 
在Appdelegate.m
 
  
 
@synthesize volumeDelegate;
 - (void)volumeChanged:(NSNotification *)notification
 {
volumeDelegate =1.0
    PlayerViewController *volumeObject=[[PlayerViewController alloc]init];
[volumeObject setVolumeForAVAudioPlayer];
}@H_404_4@ 
 
在Playerviewcontroller.h
 
  
 
-(void)setVolumeForAVAudioPlayer;@H_404_4@ 
 
在Playerviewcontroller.m
 
  
 
@interface PlayerViewController ()
{
AppDelegate *appdelegate;

 }
  -(void)viewDidLoad
  {
  appdelegate = (AppDelegate*)[[UIApplication sharedApplication] delegate];
  }

  -(void)setVolumeForAVAudioPlayer
  {
[appdelegate.sharedplayer  setVolume:appdelegate.volumeDelegate];
NSLog(@"System Volume in player view:  %f",appdelegate.volumeDelegate);
 }@H_404_4@ 
 
当我运行这个我得到volumeDelegate值为零如下.
 
 
播放器视图中的系统音量：0.000000000
 
 
我在这里做的错误是什么