一直遇到这个问题,今天最终找到了解决方法.

在我们的项目中常常遇到横竖屏切换,而又有某个特定的界面必须是特定的显示方式(横屏或竖屏).这就须要例如以下的处理了.

强制转成横屏:if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {SEL selector = NSSelectorFromString(@"setOrientation:");NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];[invocation setSelector:selector];[invocation setTarget:[UIDevice currentDevice]];int val = UIInterfaceOrientationLandscapeRight;[invocation setArgument:&val atIndex:2];[invocation invoke];
}

方法二： 通过推断状态栏来设置视图的transform属性。

- (void)deviceOrientationDidChange: (NSNotification *)notification
{UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];CGFloat startRotation = [[self valueForKeyPath:@"layer.transform.rotation.z"] floatValue];CGAffineTransform rotation;switch (interfaceOrientation) {case UIInterfaceOrientationLandscapeLeft:rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 270.0 / 180.0);break;case UIInterfaceOrientationLandscapeRight:rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 90.0 / 180.0);break;case UIInterfaceOrientationPortraitUpsideDown:rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 180.0 / 180.0);break;default:rotation = CGAffineTransformMakeRotation(-startRotation + 0.0);break;}view.transform = rotation;
}

说明一下：假设实现了下边的两个方法。你的应用程序在初始化的时候有多少个controller就会走多少次下边两个方法。showldAutorotate这种方法是再你即将旋转屏幕的时候，就会再次调用，仅仅要在这里推断好YES或者NO就好了。

在你须要的时候通过shouldAutorot这个变量打开，不须要的时候关闭就能够了。有什么不明确的，能够增加上边的QQ群。里边问我。

-(BOOL)shouldAutorotate    //是否支持旋转。假设为NO，则下边的方法就不会调用，假设为YES，才会调用
{if (!shouldAutorot) {return NO;}else{return YES;}
}-(NSUInteger)supportedInterfaceOrientations
{return UIInterfaceOrientationMaskAllButUpsideDown;
}