IOS疯狂基础之屏幕旋转控制，获得当前方向

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
{
return NO;
}
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskPortrait;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return UIInterfaceOrientationPortrait;
}

始终保持横屏

//iOS 5
- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
return (toInterfaceOrientation == self.preferredInterfaceOrientationForPresentation);
}
//iOS 6
- (BOOL) shouldAutorotate
{
return YES;
}
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskLandscapeRight;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return UIInterfaceOrientationLandscapeRight;
}

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 @implementation UINavigationController (Rotation_IOS6)
2 -(BOOL)shouldAutorotate {
3     return [[self.viewControllers lastObject] shouldAutorotate];
4 }
5
6 -(NSUInteger)supportedInterfaceOrientations {
7     return [[self.viewControllers lastObject] supportedInterfaceOrientations];
8 }
9
10 - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
11     return [[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