iOS - UIImageView - 如何处理 UIImage 图像方向

iOS - UIImageView - how to handle UIImage image orientation(iOS - UIImageView - 如何处理 UIImage 图像方向)

问题描述

是否可以设置 UIImageView 来处理图像方向?当我将 UIImageView 设置为具有方向 RIGHT 的图像(它是相机胶卷中的照片)时，图像向右旋转，但我想以正确的方向显示它，拍下来的样子.

Is it possible to setup UIImageView to handle image orientation? When I set the UIImageView to image with orientation RIGHT (it is photo from camera roll), the image is rotated to right, but I want to show it in proper orientation, as it was taken.

我知道我可以旋转图像数据，但可以做得更优雅吗?

I know I can rotate image data but it is possible to do it more elegant?

推荐答案

如果我理解，你想要做的就是忽略 UIImage 的方向?如果是这样，那么您可以这样做:

If I understand, what you want to do is disregard the orientation of the UIImage? If so then you could do this:

UIImage *originalImage = [... whatever ...];

UIImage *imageToDisplay =
     [UIImage imageWithCGImage:[originalImage CGImage]
              scale:[originalImage scale]
              orientation: UIImageOrientationUp];

因此，您正在创建一个新的 UIImage，其像素数据与原始数据相同(通过其 CGImage 属性引用)，但您指定的方向不旋转数据.

So you're creating a new UIImage with the same pixel data as the original (referenced via its CGImage property) but you're specifying an orientation that doesn't rotate the data.

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