带有用户照片的相机叠加层未按编辑后保存

Question

我使用带有剪切的透明图像，供用户插入/拍摄自己的图像。由于某种原因，在使用 UIImagePickerControllerEditedImage 并裁剪用户拍摄的照片时，图像不会按编辑后的状态保存；例如，参见照片。

我的问题是图像没有准确保存照片的编辑方式。 （即：裁剪/调整大小）。

设置 UIImagePicker

-(void)choosePhotoDialog:(id)sender
{        
    OverlayView * overlay = [[OverlayView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH_IPHONE, SCREEN_HEIGTH_IPHONE) andPhoto:[dict objectForKey:@"imageUrl"]];
    [overlay setUserInteractionEnabled: NO];

    UIImagePickerController * picker = [[UIImagePickerController alloc] init];
    [picker setSourceType: UIImagePickerControllerSourceTypeCamera];
    [picker setDelegate: self];
    [picker setAllowsImageEditing: YES];
    [picker setShowsCameraControls: YES];
    [picker setNavigationBarHidden: YES];
    [picker setWantsFullScreenLayout: YES];
    [picker setCameraOverlayView: overlay];
    [self presentModalViewController:picker animated:YES];  
    [picker release];
}

编辑图像后：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    SDWebImageManager * manager = [SDWebImageManager sharedManager];
    UIImage * cachedImage  = [manager imageWithURL: [NSURL URLWithString: @"http://www.someurl.com/test.png"]];
    UIImage * userOriginal = [info valueForKey:UIImagePickerControllerEditedImage];

    /*  combining the overlay and the user-photo  */
    UIGraphicsBeginImageContext( CGSizeMake(640,960) );

        /*  for some reason I have to push the user-photo
            down 60 pixels for it to show correctly as it
            was edited.
         */
        [userOriginal drawAtPoint:CGPointMake(0,60)];
        [cachedImage drawAtPoint:CGPointMake(0,0)];

        UIImage * draft = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    UIImageWriteToSavedPhotosAlbum( draft, self, @selector(image:didFinishSavingWithError:contextInfo:), nil );       
}

同样，编辑“裁剪”部分中存在白色空格，如下所示：

Answer 1

我相信这是因为编辑后的照片不包括被半透明框架覆盖层遮挡的部分，该覆盖层显示为标准 iOS 图像编辑器的一部分。 （您发现必须偏移的 60 像素是此叠加层上半部分的 60 像素。）

您可以从 info 字典中提取并展开 UIImagePickerControllerCropRect 键，然后自己在 UIImagePickerControllerOriginalImage 上再次进行编辑，以获得您想要的结果图像。