强制iphone界面马上旋转

在现在的ios sdk中，我们一般通过UIApplication的setStatusBarOrientation:来进行View的强制旋转（当然，还要配合- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation），但是，setStatusBarOrientation并不一定马上会执行shouldAutorotateToInterfaceOrientation进行界面旋转，这时，有个小技巧可以让界面马上旋转过来，那就是调用一下 UINavigationController的presentModalViewController:animated:

.........{
    //为了马上旋转过来
    UINavigationController* nav = [[GurgleAppDelegate getAppDelegate] navigationController];
    UIViewController *controller = [[UIViewController alloc] init];
    UINavigationController *parentController = [[UINavigationController alloc] initWithRootViewController:controller];
    [nav presentModalViewController:parentController animated:NO];
    [controller dismissModalViewControllerAnimated:NO];
    [parentController release];
    [controller release];

}

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

}