屏幕旋转

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本文主要介绍屏幕旋转的使用步骤, 以及一些注意事项.

一, 设备方向(UIDevice) 设备方向通过加速计获取, 如果有获取设备方向, 一定要先开启设备旋转的通知, 否则一致是 unkown 开启设备方向通知方法: if (![[UIDevice currentDevice] isGeneratingDeviceOrientationNotifications]) { [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; } 不需要监听的时候请关闭

二, 界面方向(statusBarOrientation)

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通过监听通知, 获取设备是否旋转, 然后用[UIApplication sharedApplication] statusBarOrientation获取当前设备方向

模态强制横屏的方法:

  • (BOOL)shouldAutorotate{ return NO; }
  • (UIInterfaceOrientationMask)supportedInterfaceOrientations{ return UIInterfaceOrientationMaskLandscapeLeft; }
  • (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{ return UIInterfaceOrientationLandscapeLeft; }

push强制横屏的方法:

  • (void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; [self setInterfaceOrientation:UIInterfaceOrientationLandscapeLeft];

}

  • (BOOL)shouldAutorotate{ //必须返回yes return YES; }
  • (UIInterfaceOrientationMask)supportedInterfaceOrientations{ return UIInterfaceOrientationMaskLandscapeLeft; }
  • (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{ return UIInterfaceOrientationLandscapeLeft; }

//必须实现如下方法, 可以在基类实现

  • (void)setInterfaceOrientation:(UIInterfaceOrientation)orientation { if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) { SEL selector = NSSelectorFromString(@”setOrientation:”); NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]]; [invocation setSelector:selector]; [invocation setTarget:[UIDevice currentDevice]]; [invocation setArgument:&orientation atIndex:2]; [invocation invoke];

    } }

如果跟控制是tabbar 将屏幕旋转交由选中控制器去实现 /** 是否支持自动旋转屏幕 */

  • (BOOL)shouldAutorotate{ return [self.selectedViewController shouldAutorotate]; }

/** 屏幕旋转支持的方向 */

  • (UIInterfaceOrientationMask)supportedInterfaceOrientations{ return [self.selectedViewController supportedInterfaceOrientations]; }

/** 模态出的控制器优先支持的屏幕方向

*/

  • (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{ return [self.selectedViewController preferredInterfaceOrientationForPresentation]; }

如果跟控制器是navigation, 将旋转交由栈顶控制器实现 /将屏幕旋转交由导航控制器的栈顶控制器管理

  • (BOOL)shouldAutorotate{ return [self.viewControllers.lastObject shouldAutorotate]; }
  • (UIInterfaceOrientationMask)supportedInterfaceOrientations{ return [self.viewControllers.lastObject supportedInterfaceOrientations]; }
  • (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{ return [self.viewControllers.lastObject preferredInterfaceOrientationForPresentation]; }

注意事项: 1, 屏幕旋转取消交互 2,屏幕旋转重新刷新界面, 如果是tableView, 不reloadData可能cell显示不全