ios - UIImagePickerController 不旋转和平移/缩放

Question

我正在尝试反转我的 UIImagePickerController 以便它能够填满 iPhone 5 的屏幕并且显然是反转的。这是我为 UIImagePickerController 编写的代码:

- (void)applicationDidBecomeActive
{

UIImagePickerController *imageViewPickerController = [[UIImagePickerController alloc] init];
imageViewPickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
imageViewPickerController.showsCameraControls = NO;
imageViewPickerController.cameraViewTransform = CGAffineTransformMakeRotation(DEGREES_RADIANS(180));
imageViewPickerController.cameraViewTransform = CGAffineTransformMakeTranslation(0.0, 71.0);
imageViewPickerController.cameraViewTransform = CGAffineTransformScale(imageViewPickerController.cameraViewTransform, 1.333333, 1.333333);


[self presentViewController:imageViewPickerController
                   animated:NO
                 completion:NULL];


}

如果我运行这段代码，我不会得到任何反转。如果我这样修改它:

- (void)applicationDidBecomeActive
{

UIImagePickerController *imageViewPickerController = [[UIImagePickerController alloc] init];
imageViewPickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
imageViewPickerController.showsCameraControls = NO;
    imageViewPickerController.cameraViewTransform = CGAffineTransformMakeTranslation(0.0, 71.0);
imageViewPickerController.cameraViewTransform = CGAffineTransformScale(imageViewPickerController.cameraViewTransform, 1.333333, 1.333333);
imageViewPickerController.cameraViewTransform = CGAffineTransformMakeRotation(DEGREES_RADIANS(180));


[self presentViewController:imageViewPickerController
                   animated:NO
                 completion:NULL];


}

它会反转，但只占用 320x320 的屏幕正方形，忽略我的其他转换。如果有人可以提供一些关于如何让它遵循所有这些论点的专业知识，我将不胜感激。

Answer 1

您应该尝试将您创建的所有转换连接到一个转换中，然后将其设置为 cameraViewTransform，如下所示:

CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 71.0);
CGAffineTransform scale = CGAffineTransformMakeScale(1.333333, 1.333333);
CGAffineTransform rotate = CGAffineTransformMakeRotation(DEGREES_RADIANS(180));
CGAffineTransform transform = CGAffineTransformConcat(translate, scale);
transform = CGAffineTransformConcat(transform, rotate);
imageViewPickerController.cameraViewTransform = transform;