我需要在appDidBecomeActive:(UIApplication *)应用程序中获取界面方向
[application statusBarOrientation];
但是如果应用程序从关闭开始(即没有从后台恢复),这将始终返回纵向,当从后台恢复时它可以正常工作。
此外,我尝试使用UIDevice方向以及状态栏方向,但UIDevice方向可能不是界面方向。
那么有没有办法在app delegate appDidBecomeActive中获得界面定位?
谢谢!
答案 0 :(得分:1)
您需要做的是在启动视图控制器中处理此问题。您可以使用组合interfaceOrientation,shouldAutorotateToInterfaceOrientation,didAutorotateToInterfaceOrientation等。
基本上,创建一个视图控制器,您将拥有它作为根视图控制器。在那里,确定shouldAutorotateToInterfaceOrientation中的方向变化(它将始终是viewDidLoad中的纵向或横向,具体取决于你的xib,所以不要在那里进行)。使用NSTimer或其他任何方式显示图像。在计时器之后,显示您的常规应用程序屏幕。
在您拥有视图控制器之前无法显示图像,因此必须等到视图控制器为您提供interfaceOrientation更改。您应该专注于第一个视图控制器,而不是应用程序委托。
<强> AppDelegate.h 强>
#import <UIKit/UIKit.h>
@class SplashViewController;
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (retain, nonatomic) IBOutlet UIWindow *window;
@property (retain, nonatomic) SplashViewController *splashController;
-(void)showSplash;
@end
<强> AppDelegate.m 强>
#import "AppDelegate.h"
#import "SplashViewController.h"
@implementation AppDelegate
@synthesize window = _window, splashController = _splashController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self showSplash];
[self.window makeKeyAndVisible];
[self performSelector:@selector(registerBackground) withObject:nil afterDelay:5.0];
return YES;
}
-(void)showSplash
{
SplashViewController *splash = [[SplashViewController alloc] initWithNibName:@"SplashViewController" bundle:nil];
[self.window addSubview:splash.view];
self.splashController = splash;
[splash release];
//have to add a delay, otherwise it will be called on initial launch.
[NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(removeSplash:) userInfo:nil repeats:NO];
}
-(void)registerBackground
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(returnFromBackground:)
name:UIApplicationDidBecomeActiveNotification
object:nil];
}
-(void)returnFromBackground:(NSNotification *)notification
{
[self showSplash];
}
-(void)removeSplash:(NSTimer *)timer
{
[self.splashController.view removeFromSuperview];
self.splashController = nil;
}
- (void)dealloc
{
[_window release];
[_splashController release];
[super dealloc];
}