如何在设备定向的事件（而不是界面方向）上订阅自我？ [英] How to subscribe self on the event of Device Orientation(not interface orientation)?

问题描述

在我的应用程序中我想调用一些方法在CCScene myscene在设备旋转（方向更改）的情况下。我禁用自动旋转（因为我希望它不会发生）。

问题是：我想根据我的设备方向改变场景中的重力。
我的代码：

   - （void）onEnter 
 {
 [super onEnter] 
 [[NSNotificationCenter defaultCenter] addObserver：self selector：@selector（notification_OrientationWillChange :) name：UIApplicationWillChangeStatusBarOrientationNotification object：nil]; 
 [[NSNotificationCenter defaultCenter] addObserver：self selector：@selector（notification_OrientationDidChange :) name：UIApplicationDidChangeStatusBarOrientationNotification object：nil]; 
} 
  - （void）onExit 
 {
 // [[NSNotificationCenter defaultCenter] removeObserver：self name：UIApplicationWillChangeStatusBarOrientationNotification object：nil]; 
 // [[NSNotificationCenter defaultCenter] removeObserver：self name：UIApplicationDidChangeStatusBarOrientationNotification object：nil]; 
} 
  - （void）notification_OrientationWillChange：（NSNotification *）n 
 {
 orientation =（UIInterfaceOrientation）[[n.userInfo objectForKey：UIApplicationStatusBarOrientationUserInfoKey] intValue]; 
} 
  - （void）notification_OrientationDidChange：（NSNotification *）n 
 {
 if（orientation == UIInterfaceOrientationLandscapeLeft）{
 b2Vec2 gravity（0，-10）; 
 world-> SetGravity（gravity）; 
} 
 if（orientation == UIInterfaceOrientationLandscapeRight）{
 b2Vec2 gravity（0，10）; 
 world-> SetGravity（gravity）; 
} 
} 
  

但在这种情况下， （如果禁用，设备实际上不改变它的状态栏方向）
你能帮助我吗？

解决方案

  [[NSNotificationCenter defaultCenter] addObserver：self 
 selector：@selector（orientationChanged :) 
 name：@UIDeviceOrientationDidChangeNotification
 ：零]; 
 
 
 
  - （void）orientationChanged：（NSNotification *）notification {
 UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; 
 
 // do stuff 
 NSLog（@Orientation changed）; 
} 
  

您必须检查设备方向而不是状态栏。

typedef枚举{
UIDeviceOrientationUnknown，
UIDeviceOrientationPortrait，//垂直设备，底部的主页按钮
UIDeviceOrientationPortraitUpsideDown， //设备垂直放置，顶部的主页按钮
UIDeviceOrientationLandscapeLeft，//面向水平，主页按钮在右侧
UIDeviceOrientationLandscapeRight，//设备水平放置，左边的主页按钮
UIDeviceOrientationFaceUp ，//面向设备的平面，面向上
UIDeviceOrientationFaceDown //面向设备的平面，面朝下
} UIDeviceOrientation;


in my app i want to call some method in CCScene myscene in the case of device rotation(orientation change).I disabled the autorotation(because i want it not to happen).

The issue is: i want to change gravity in the scene depending on my device orientation. My code :

-(void) onEnter
{
    [super onEnter];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notification_OrientationWillChange:) name:UIApplicationWillChangeStatusBarOrientationNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notification_OrientationDidChange:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
}
-(void) onExit
{
    //[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillChangeStatusBarOrientationNotification object:nil];
    //[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
}
-(void)notification_OrientationWillChange:(NSNotification*)n
{
    orientation = (UIInterfaceOrientation)[[n.userInfo objectForKey:UIApplicationStatusBarOrientationUserInfoKey] intValue];
}
-(void)notification_OrientationDidChange:(NSNotification*)n
{
    if (orientation == UIInterfaceOrientationLandscapeLeft) {
        b2Vec2 gravity( 0, -10);
        world->SetGravity(gravity);
    }
    if (orientation == UIInterfaceOrientationLandscapeRight) {
        b2Vec2 gravity( 0, 10);
        world->SetGravity(gravity);
    }
}

But in this case i can get notifications only in the case of autorotation enabled.(if it disabled, device is actually don't change it status bar orientation) Can you help me?

解决方案

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(orientationChanged:)
                                             name:@"UIDeviceOrientationDidChangeNotification" 
                                           object:nil];



- (void)orientationChanged:(NSNotification *)notification{  
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

    //do stuff
    NSLog(@"Orientation changed");          
}

You must check for Device orientation not status bar.

typedef enum {
        UIDeviceOrientationUnknown,
        UIDeviceOrientationPortrait,            // Device oriented vertically, home button on the bottom
        UIDeviceOrientationPortraitUpsideDown,  // Device oriented vertically, home button on the top
        UIDeviceOrientationLandscapeLeft,       // Device oriented horizontally, home button on the right
        UIDeviceOrientationLandscapeRight,      // Device oriented horizontally, home button on the left
        UIDeviceOrientationFaceUp,              // Device oriented flat, face up
        UIDeviceOrientationFaceDown             // Device oriented flat, face down
    } UIDeviceOrientation;

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