在相机视图中保存带有叠加层的图像

Question

我使用以下代码在相机视图上添加了一个叠加层，

- (IBAction)takephoto:(id)sender {

    mediaPicker = [[UIImagePickerController alloc] init];
    mediaPicker.delegate=self;
    mediaPicker.allowsEditing = YES;
    mediaPicker.sourceType = UIImagePickerControllerSourceTypeCamera;

    // overlay on top of camera lens view
    UIImageView *cameraOverlayView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Overlay2.png"]];
    cameraOverlayView.alpha = 0.0f;
    mediaPicker.cameraOverlayView = cameraOverlayView;

    // animate the fade in after the shutter opens
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDelay:2.2f];
    cameraOverlayView.alpha = 1.0f;
    [UIView commitAnimations];

    [self presentViewController:mediaPicker animated:YES completion:Nil];

}

如何保存带有叠加图像的捕获图像？ 也就是说，我需要将捕获的图像和覆盖图保存为单个图像。

Answer 1

我做过这样的事情，你所做的是采用一个UIView作为容器视图，现在向它添加两个 I mage 视图，就像我在下面的代码中所做的那样。 创建容器视图并添加两个 ImageView，使其在您的故事板中如下所示

现在只需使用此代码

UIGraphicsBeginImageContextWithOptions(
    containerView.bounds.size, 
    view.opaque,
    0.0
);

[containerView.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;

您将获得的这个 img 是两个 ImageView 的组合图像

Answer 2

        imgPicker = [[UIImagePickerController alloc] init];
    imgPicker.allowsEditing = NO;
    imgPicker.delegate   = self;
    imgPicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    imgPicker.showsCameraControls=NO;
    imgPicker.extendedLayoutIncludesOpaqueBars = YES;
    imgPicker.edgesForExtendedLayout = YES;
    imgPicker.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;
    imgPicker.cameraCaptureMode=UIImagePickerControllerQualityTypeHigh;

    imgPicker.cameraViewTransform = CGAffineTransformScale(imgPicker.cameraViewTransform, CAMERA_TRANSFORMWidth , CAMERA_TRANSFORM);


    UIView* overlayView = [[UIView alloc] initWithFrame:imgPicker.view.frame];
    CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 25.0);
    imgPicker.cameraViewTransform = CGAffineTransformScale(translate, CAMERA_TRANSFORM, CAMERA_TRANSFORM);
    imgPicker.cameraOverlayView = overlayView;



    UIImageView *stripImageVW=[[UIImageView alloc]initWithFrame:CGRectMake(0,self.view.frame.size.height-70,self.view.frame.size.width,70)];

    [stripImageVW setImage:[UIImage imageNamed:@"Black_StripView"]];
    [overlayView addSubview:stripImageVW];