iphone - 在我的Movieplayer应用程序中使用加速度计

Question

我有一个应用程序可以播放来自网络服务器的视频，但它只能横向播放。我希望我的应用使用加速度计以横向和纵向播放视频。我希望我的视频播放功能看起来像iPhone中的youtube应用。谁能帮我怎么做？谢谢

Answer 1

为此，您不需要加速度计。取而代之的是，您侦听方向更改时从UIDevice单例实例发送的通知。在“应用程序didFinishLaunching withOptions”方法中，键入以下内容:

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(deviceOrientationDidChange) name: UIDeviceOrientationDidChangeNotification object: nil];

然后创建此方法来处理方向更改:

- (void)deviceOrientationDidChange {
int orientation = (int)[[UIDevice currentDevice]orientation];
switch (orientation) {
    case UIDeviceOrientationFaceDown:
        NSLog(@"UIDeviceOrientationFaceDown" );
        // handle orientation
        break;
    case UIDeviceOrientationFaceUp:
        NSLog(@"UIDeviceOrientationFaceUp" );
        // handle orientation
        break;
    case UIDeviceOrientationLandscapeLeft:
        NSLog(@"UIDeviceOrientationLandscapeLeft" );
        // handle orientation
        break;
    case UIDeviceOrientationLandscapeRight:
        NSLog(@"UIDeviceOrientationLandscapeRight" );
        // handle orientation
        break;
    case UIDeviceOrientationPortrait:
        NSLog(@"UIDeviceOrientationPortrait" );
        // handle orientation
        break;
    case UIDeviceOrientationPortraitUpsideDown:
        NSLog(@"UIDeviceOrientationPortraitUpsideDown" );
        // handle orientation
        break;
    case UIDeviceOrientationUnknown:
        NSLog(@"UIDeviceOrientationUnknown" );
        // handle orientation
        break;

    default:
        break;
}
}