哪种方法确定设备从纵向模式到横向模式的旋转

Question

我有这个方法，但我应该把这个方法放在哪里???

[[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

取决于你想要做什么。如果您只想更改视图的方向以匹配设备，则在viewController中实现willRotateToInterface和shouldAutorotateToInterfaceOrientation。这比任何事情都简单得多。在shouldAutorotateToInterfaceOrientation中，对于您愿意接受的每个方向，您都会得到一个YES。这是例程的样子：

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

Answer 2

请参阅this thread。