在Appdelegate.h
我在Appdelegate.h和Appdelegate.m文件中导入了playerviewcontroller. @H_301_3@@class PlayerViewController; @property(nonatomic)float volumeDelegate;

在Appdelegate.m

@H_301_3@@synthesize volumeDelegate; - (void)volumeChanged:(NSNotification *)notification { volumeDelegate =1.0 PlayerViewController *volumeObject=[[PlayerViewController alloc]init]; [volumeObject setVolumeForAVAudioPlayer]; }

在Playerviewcontroller.h

@H_301_3@-(void)setVolumeForAVAudioPlayer;

在Playerviewcontroller.m

@H_301_3@@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); }

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