状态栏旋转通知

Question

我想知道状态栏何时旋转.接收屏幕旋转通知可能会使问题与"正面朝上"和"正面朝下"等方向混淆.因此,根据状态栏的方向管理轮换是最简单,最干净的方法.当方向发生变化时,如何收到通知？

Answer 1

您需要注册UIApplicationDidChangeStatusBarOrientationNotification通知.

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(statusBarOrientationChange:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];

- (void)statusBarOrientationChange:(NSNotification *)notification {
    UIInterfaceOrientation orient = [notification.userInfo[UIApplicationStatusBarOrientationUserInfoKey] integerValue];

    // handle the interface orientation as needed
}

请注意,此方法永远不会导致"面朝上"或"面朝下"设备方向,因为这只涉及界面方向.

Answer 2

//register to receive orientation notifications somewhere:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(detectOrientation) name:UIDeviceOrientationDidChangeNotification object:nil];


    -(void)detectOrientation{

        switch ([[UIDevice currentDevice] orientation]) {

            case UIDeviceOrientationFaceDown:{
            }
            break;

            default:{
            }
            break;

        }
    }

如果不起作用，请检查方向锁定！浪费了几个小时。