设备如何知道方向变化的功能是
-(void)viewWillLayoutSubviews 和
-(void)viewDidLayoutSubviews
但是，它们只是在控制器中；
现在我想知道是否有类似的函数可以知道文件 AppDelegate.m 中方向的变化
- (void)navigationController:(UINavigationController *)navigationController
willShowViewController:(UIViewController *)viewController
animated:(BOOL)animated {
UINavigationBar *morenavbar = navigationController.navigationBar;
UINavigationItem *morenavitem = morenavbar.topItem;
//We don't need Edit button in More screen.
morenavitem.rightBarButtonItem = nil;
morenavitem.title = nil;
UIImage *backgroundImage = [UIImage imageNamed:@"nav.png"];
[morenavbar setBackgroundImage:backgroundImage
forBarMetrics:UIBarMetricsDefault];
UIDeviceOrientation currentDeviceOrientation =
[[UIDevice currentDevice] orientation];
UIInterfaceOrientation currentInterfaceOrientation =
[[UIApplication sharedApplication] statusBarOrientation];
if (UIDeviceOrientationIsLandscape(currentDeviceOrientation)||
UIDeviceOrientationIsLandscape(currentInterfaceOrientation)){
UIImage *backgroundImageLandscape = [UIImage imageNamed:@"navbar_landscape.png"];
[morenavbar setBackgroundImage:backgroundImageLandscape forBarMetrics:UIBarMetricsDefault];
}
}
您可以注册轮换发生时的通知
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(handleDidChangeStatusBarOrientationNotification:)
name:UIApplicationDidChangeStatusBarOrientationNotification
object:nil];
然后实现消息发送时调用的方法
- (void)handleDidChangeStatusBarOrientationNotification:(NSNotification *)notification;
{
// Do something interesting
NSLog(@"The orientation is %@", [notification.userInfo objectForKey: UIApplicationStatusBarOrientationUserInfoKey]);
}
或者查看文档UIApplicationDidChangeStatusBarOrientationNotification这将为您提供
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