哪种方法确定设备从纵向到横向模式的旋转

Question

我有这种方法，但我应该在哪里放这个方法？

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

// This method is called by NSNotificationCenter when the device is rotated. 
-(void) receivedRotate: (NSNotification*) notification 
{ 
    UIDeviceOrientation interfaceOrientation = [[UIDevice currentDevice] orientation]; 
    if(interfaceOrientation != UIDeviceOrientationUnknown) 
     [self deviceInterfaceOrientationChanged:interfaceOrientation]; 
} 

Answer 1

请参阅this thread。

Answer 2

取决于你正在尝试做什么。如果您只想更改视图的方向以匹配设备，则在您的viewController中实现willRotateToInterface和shouldAutorotateToInterfaceOrientation。这比任何事情都简单得多。在shouldAutorotateToInterfaceOrientation中，您肯定会为您愿意接受的每个方向重新编写一个YES。这里是例程的样子：

// Override to allow orientations other than the default portrait orientation. 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { 
    // Return YES for supported orientations 
    return ((interfaceOrientation == UIInterfaceOrientationLandscapeLeft) || 
      (interfaceOrientation == UIInterfaceOrientationLandscapeRight)); 
}