iPhone相机中的问题overelay图像方向

Question

UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(dragger.frame.origin.x, dragger.frame.origin.y,dragger.frame.size.width, dragger.frame.size.height)] ; 
imgView.image = dragger.image; 
overlayView = [[UIView alloc] initWithFrame:CGRectMake(dragger.frame.origin.x,dragger.frame.origin.y,dragger.frame.size.width, dragger.frame.size.height)]; 
[overlayView addSubview:imgView]; 

//open the camera 

self.picker = [[UIImagePickerController alloc] init]; 
self.picker.delegate = self; 
self.picker.sourceType = UIImagePickerControllerSourceTypeCamera; 
self.picker.cameraOverlayView=overlayView; 
[self.navigationController presentModalViewController:self.picker animated:YES]; 

在纵向模式下可以正常工作，但叠加图像在横向模式下不会改变。

我该如何做到这一点，因为我需要帮助吗？

Answer 1

您需要注册为定向变化......这样

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; 
    [[NSNotificationCenter defaultCenter] addObserver:self 
              selector:@selector(orientationChanged:) 
               name:@"UIDeviceOrientationDidChangeNotification" 
               object:nil]; 

，然后在同一类写这个功能....

- (void) orientationChanged:(NSNotification *)notification{ 
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; 

    //do stuff 

    if (orientation==UIDeviceOrientationPortrait) { 
     imagePickerController.cameraOverlayView = portraitImageView; 

    } 

    else if(orientation==UIDeviceOrientationLandscapeLeft) 
    { 

     imagePickerController.cameraOverlayView = landscapeImageView; 

    } 

}