iOS8的屏幕旋转的问题

判断横竖屏。http://www.cocoachina.com/ask/questions/show/121301

//self.cameraView是相机view

- (NSUInteger)supportedInterfaceOrientations

{

    UIInterfaceOrientation e = [[UIApplication sharedApplication] statusBarOrientation];

    if (e == UIInterfaceOrientationLandscapeLeft) {

        if (self.cameraView) {

            self.cameraView.transform = CGAffineTransformMakeRotation((- * M_PI) / 180.0f);

        }

    }else if (e == UIInterfaceOrientationLandscapeRight) {

        if (self.cameraView) {

            self.cameraView.transform = CGAffineTransformMakeRotation(( * M_PI) / 180.0f);

        }

    }

    return (UIInterfaceOrientationMaskLandscape);

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    //m_bScreen是bool 型，判断横竖屏。

    if ([[[UIDevice currentDevice]systemVersion ]floatValue]  >= 8.0) {

        BOOL m_bScreen = NO;

        UIInterfaceOrientation e = [[UIApplication sharedApplication] statusBarOrientation];

        if (e == UIInterfaceOrientationLandscapeLeft) {

            m_bScreen = NO;

        }else if (e == UIInterfaceOrientationLandscapeRight) {

            m_bScreen = YES;

        }

        if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {

            NSNumber *num = [[NSNumber alloc] initWithInt:(m_bScreen?UIInterfaceOrientationLandscapeRight:UIInterfaceOrientationLandscapeLeft)];

            [[UIDevice currentDevice] performSelector:@selector(setOrientation:) withObject:(id)num];

            [UIViewController attemptRotationToDeviceOrientation];//这行代码是关键

        }

        SEL selector=NSSelectorFromString(@"setOrientation:");

        NSInvocation *invocation =[NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];

        [invocation setSelector:selector];

        [invocation setTarget:[UIDevice currentDevice]];

        int val =m_bScreen?UIInterfaceOrientationLandscapeRight:UIInterfaceOrientationLandscapeLeft;

        [invocation setArgument:&val atIndex:];

        [invocation invoke];

    }

}

获取相机view的方法：

#pragma mark UINavigationControllerDelegate

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{

    if ([[[UIDevice currentDevice]systemVersion ]floatValue]  >= 8.0) {

        UIView *PLCameraView=[self findView:viewController.view withName:@"PLImagePickerCameraView"];

        NSArray *svarray = [PLCameraView subviews];

        self.imagePickerController.cameraView = svarray[0];

        for (int i = ; i < svarray.count; i++)  { //i: 0 相机 1 拍照界面 2 重拍界面

            if (i == ) {

                NSArray *arr = [svarray[] subviews];

                for (int i = ; i < arr.count; i++) {

                    if (i == ) { //i: 1 前置摄像头切换

                        [[arr objectAtIndex:i] setAlpha:0.0f];

                    }

                }

            }

        }

    }else if ([[[UIDevice currentDevice]systemVersion ]floatValue]  >= 7.0) {

        UIView *PLCameraView=[self findView:viewController.view withName:@"PLCameraView"];

        NSArray *svarray = [PLCameraView subviews];

        for (int i = ; i < svarray.count; i++)  { //i: 0 相机 1 拍照界面 2 重拍界面

            if (i == ) {

                NSArray *arr = [svarray[] subviews];

                for (int i = ; i < arr.count; i++) {

                    if (i == ) { //i: 1 前置摄像头切换

                        [[arr objectAtIndex:i] setAlpha:0.0f];

                    }

                }

            }

        }

    }

}

#pragma mark get/show the UIView we want

//Find the view we want in camera structure.

-(UIView *)findView:(UIView *)aView withName:(NSString *)name{

    Class cl = [aView class];

    NSString *desc = [cl description];

    if ([name isEqualToString:desc])

        return aView;

    for (NSUInteger i = ; i < [aView.subviews count]; i++)

    {

        UIView *subView = [aView.subviews objectAtIndex:i];

        subView = [self findView:subView withName:name];

        if (subView)

            return subView;

    }

    return nil;

}