获得当前屏幕方向
self.interfaceOrientation或[[UIApplication sharedApplication] statusBarOrientation]
if(self.interfaceOrientation==UIDeviceOrientationLandscapeRight) {
XXOO
}
不旋转，保持竖屏
//iOS 5-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{return(toInterfaceOrientation==UIInterfaceOrientationPortrait);}//iOS 6-(BOOL)shouldAutorotate{returnNO;}-(NSUInteger)supportedInterfaceOrientations{returnUIInterfaceOrientationMaskPortrait;}-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{returnUIInterfaceOrientationPortrait;}
始终保持横屏
//iOS 5-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{return(toInterfaceOrientation==self.preferredInterfaceOrientationForPresentation);}//iOS 6-(BOOL)shouldAutorotate{returnYES;}-(NSUInteger)supportedInterfaceOrientations{returnUIInterfaceOrientationMaskLandscapeRight;}-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{returnUIInterfaceOrientationLandscapeRight;}
在使用UINavigationController时发现，无论怎么设置上面方法的返回，都无法控制UINavigationController的旋转，这似乎是iOS的一个bug。但无论如何，以下是stackflow上面的一个解决方法：
1@implementationUINavigationController (Rotation_IOS6)2-(BOOL)shouldAutorotate {3return[[self.viewControllers lastObject] shouldAutorotate];4}56-(NSUInteger)supportedInterfaceOrientations {7return[[self.viewControllers lastObject] supportedInterfaceOrientations];8}910-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {11return[[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];12}13@end
屏幕旋转方法调用流程
要翻转的时候，首先响应的方法：
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
return YES则支持翻转，NO则不支持。
紧接着
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
被调用。这个方法是发生在翻转开始之前。一般用来禁用某些控件或者停止某些正在进行的活动，比如停止视频播放。
再来是
-(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
这个方法发生在翻转的过程中，一般用来定制翻转后各个控件的位置、大小等。可以用另外两个方法来代替：willAnimateFirstHalfOfRotationToInterfaceOrientation:duration: 和 willAnimateSecondHalfOfRotationFromInterfaceOrientation:duration:
最后调用的是
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
这个方法发生在整个翻转完成之后。一般用来重新启用某些控件或者继续翻转之前被暂停的活动，比如继续视频播放
