UIImagePickerController的cameraViewTransform忽略了iOS 10 beta上的“缩放”和“翻译” [英] UIImagePickerController's cameraViewTransform is ignoring 'scaling' and 'translation' on iOS 10 beta

问题描述

我一直在使用下面的代码来扩展我的UIImagePickerController的实时预览以填充整个屏幕。到目前为止，这完美地运作在几天之前，我在iPhone 5上安装了iOS 10 beta 7，它不再扩展。我可以在UIImagePickerController的视图底部看到黑色补丁。似乎 cameraViewTransform 忽略 CGAffineTransformMakeScale 和 CGAffineTransformMakeTranslation 调用。

I have been using below code to scale my UIImagePickerController's live preview to fill the entire screen. This worked perfectly till now. Before few days, I installed iOS 10 beta 7 on an iPhone 5 and it doesn't scale anymore. I can see black patch at the bottom of UIImagePickerController's view. Seems like cameraViewTransform is ignoring the CGAffineTransformMakeScale and CGAffineTransformMakeTranslation calls.

这就是我启动相机控制器的方法。我已将allowsEditing和showsCameraControls设置为否，以便提供我自己的自定义叠加视图。

objImagePickerController =[[UIImagePickerController alloc] init];

objImagePickerController.delegate = self;
objImagePickerController.sourceType =UIImagePickerControllerSourceTypeCamera;
objImagePickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
objImagePickerController.allowsEditing = NO;
objImagePickerController.showsCameraControls= NO;

这是我用来缩放相机实时预览的内容。

CGSize screenSize = [[UIScreen mainScreen] bounds].size;
float screenHeight= MAX(screenSize.height, screenSize.width);
float screenWidth= MIN(screenSize.height, screenSize.width);

float cameraAspectRatio = 4.0 / 3.0;
float imageWidth = floorf(screenWidth * cameraAspectRatio);
float scale = ceilf((screenHeight / imageWidth) * 10.0) / 10.0;

objImagePickerController.cameraViewTransform= CGAffineTransformMakeScale(scale, scale);

这是我将相机视图添加为子视图而不是传统的模态显示方法的方法，符合我自己的要求。

 [[[UIApplication sharedApplication] keyWindow]addSubview:objImagePickerController.view];

在iOS 10 beta 8上运行的iPhone 5s截图

在iOS 8.2上运行的iPhone 5s的屏幕截图

从上面的截图中可以看出， cameraViewTransform 不尊重iOS 10测试版中的 CGAffineTransformMakeScale 。

As noticeable from the above screenshots, the cameraViewTransform doesn't respect the CGAffineTransformMakeScale in iOS 10 beta.

其他人是否面临这个问题？这是iOS 10 beta OS中出现的一种非常奇怪的行为。我无法找到解决方法。请指教。

Did anybody else face this issue? This is a really weird behavior appearing in iOS 10 beta OS. I am unable to find a workaround for this. Please advise.

注意:: objImagePickerController是UIImagePickerController的一个实例。

NOTE:: objImagePickerController is an instance of UIImagePickerController.

推荐答案

奇怪的是，它只允许我们在演示文稿完成后转换它。

Strangely it only allows us to transform it after the presentation was completed.

示例：

self.presentViewController(
        self.imagePicker,
        animated: true,
        completion: {
            let screenSize = UIScreen.mainScreen().bounds.size
            let ratio: CGFloat = 4.0 / 3.0
            let cameraHeight: CGFloat = screenSize.width * ratio
            let scale: CGFloat = screenSize.height / cameraHeight

            self.imagePicker.cameraViewTransform = CGAffineTransformMakeTranslation(0, (screenSize.height - cameraHeight) / 2.0)
            self.imagePicker.cameraViewTransform = CGAffineTransformScale(self.imagePicker.cameraViewTransform, scale, scale)
        }
    )

此代码将转换摄像机视图以匹配屏幕大小。

This code will transform the camera view to match the screen size.

请注意，这是一种解决方法。它有效，但用户会看到它在演示时调整大小。

Note that this is a workaround. It works, but the user will see it resizing upon presentation.

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