倒装CIImage水平

Question

我正在尝试将我的CIImage水平翻转到：

image = [image imageByApplyingTransform:CGAffineTransformMakeScale(1, -1)];
image = [image imageByApplyingTransform:CGAffineTransformMakeTranslation(0, sourceExtent.size.height)];

但是我总是把图像垂直翻转

Answer 1

试着这样做：

image = [image imageByApplyingTransform:CGAffineTransformMakeScale(-1, 1)];
image = [image imageByApplyingTransform:CGAffineTransformMakeTranslation(0, sourceExtent.size.height)];

Answer 2

这将正确地翻转图像水平，并保持适当的坐标。

在Obj-C：

image = [image imageByApplyingCGOrientation: kCGImagePropertyOrientationUpMirrored];

在Swift：

image = image.oriented(.upMirrored)

https://developer.apple.com/documentation/coreimage/ciimage/2919727-oriented

如果您想要的是以一种可以在UIImage中使用它的方式来定位它，那么您需要在两个轴上翻转它。

image = image.oriented(.downMirrored)

Answer 3

亚历克斯差一点就有了，但你也需要调整翻译：

image = [image imageByApplyingTransform:CGAffineTransformMakeScale(-1, 1)];
image = [image imageByApplyingTransform:CGAffineTransformMakeTranslation(sourceExtent.size.width, 0)];