Iphone 如何知道AppDelegate中的方向已更改
设备如何知道方向变化的功能是 -(无效)视图将布局子视图和 -(无效)ViewDidLayoutSubView 但是,它们只是在控制器中; 现在我想知道有没有类似的函数可以知道AppDelegate.m文件中方向的变化Iphone 如何知道AppDelegate中的方向已更改,iphone,ios,objective-c,screen-orientation,Iphone,Ios,Objective C,Screen Orientation,设备如何知道方向变化的功能是 -(无效)视图将布局子视图和 -(无效)ViewDidLayoutSubView 但是,它们只是在控制器中; 现在我想知道有没有类似的函数可以知道AppDelegate.m文件中方向的变化 - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController
- (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];
}
}
您可以在发生旋转时注册通知
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(handleDidChangeStatusBarOrientationNotification:)
name:UIApplicationDidChangeStatusBarOrientationNotification
object:nil];
然后实现在发送消息时调用的方法
- (void)handleDidChangeStatusBarOrientationNotification:(NSNotification *)notification;
{
// Do something interesting
NSLog(@"The orientation is %@", [notification.userInfo objectForKey: UIApplicationStatusBarOrientationUserInfoKey]);
}
或者,也可以查看为您提供界面方向信息的文档。如果您正在谈论界面方向,您可以查看
UIApplicationIDChangeStatusBarOrientationNotification
,如果您希望在设备方向更改时收到通知,您可以查看UIDeviceOrientationIDChangeNotification