iphone - 这会垂直翻转我的 CIImage 吗？

Question

我很沮丧。为什么这不会垂直翻转我的 CIImage？

recognizedImage = [recognizedImage imageByApplyingTransform:CGAffineTransformTranslate(CGAffineTransformMakeScale(1, -1), 0, recognizedImage.extent.size.height)];

Answer 1

不要忘记添加CoreImage.framework到您的项目中。

这对我有用：

// Load image
UIImage *u = [UIImage imageNamed:@"myimage"];
// Convert to CIImage
CIImage *c = [[CIImage alloc] initWithImage:u];
// Apply transform
c = [c imageByApplyingTransform:CGAffineTransformTranslate(CGAffineTransformMakeScale(1, -1), 0, c.extent.size.height)];

// Convert back to UIImage
CIContext *context = [CIContext contextWithOptions:nil];
u = [UIImage imageWithCGImage:[context createCGImage:c fromRect:c.extent]];

// Load the UIImage into the view
[self.imageView setImage:u];

Answer 2

你试过把它分成两部分吗？

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