我们如何在ASP.NET mvc框架中将数据从一个视图传递到另一个视图(How we can pass data from one view to another in ASP.NET mvc framework)

 我找到了解决方案，我认为这是一个常见的问题。 所以这就是你的应用程序如何拥有自己的音量，而不是弄乱用户的铃声音量，即使你只是将声音作为系统声音播放。 
 
 你必须导入AVFoundation框架并在一个对象中保持加载，你的应用程序运行的全部时间（或视图或应用程序委托）你已初始化AVAudioPlayer，给它一个文件来播放并将其设置为“prepareToPlay”它。 .. 
 
 这是我在我的主View中所做的（用于将其他视图作为子视图加载）：在头文件中： 
 
#import <AVFoundation/AVFoundation.h>

@interface MainViewController : UIViewController {
    AVAudioPlayer *volumeOverridePlayer;
}

@property (nonatomic, retain) AVAudioPlayer *volumeOverridePlayer;
 
 在实现文件中： 
 
    @synthesize volumeOverridePlayer;

- (void)viewDidLoad
{
    [super viewDidLoad];

    volumeOverridePlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:[[NSBundle mainBundle] pathForResource:@"something" ofType:@"caf"]] error:nil];
    [volumeOverridePlayer prepareToPlay];
//...
}
 
 只需让玩家准备好播放你的文件，享受自己的音量控制，而不必通过它播放声音！ 当然，记得以dealloc发布它。 

I have found the solution to what I thought would be a common problem. So here is how your app can have its own volume, and not mess with the user's ringer volume, even if you are only playing sounds as System Sounds.
 
You have to import the AVFoundation framework and in an object that stays loaded the whole time your app runs (or view, or the app delegate) you have initialize a AVAudioPlayer, give it a file to play and set it to "prepareToPlay" it...
 
This is what i did in my main View (that is used to load other views as subviews): in the header file:
 
#import <AVFoundation/AVFoundation.h>

@interface MainViewController : UIViewController {
    AVAudioPlayer *volumeOverridePlayer;
}

@property (nonatomic, retain) AVAudioPlayer *volumeOverridePlayer;
 
In the implementation file:
 
    @synthesize volumeOverridePlayer;

- (void)viewDidLoad
{
    [super viewDidLoad];

    volumeOverridePlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:[[NSBundle mainBundle] pathForResource:@"something" ofType:@"caf"]] error:nil];
    [volumeOverridePlayer prepareToPlay];
//...
}
 
Just leave the player prepared to play your file and enjoy your own volume control without having to play the sounds through it! And of course, remember to release it in dealloc.