问题描述
在我的iPhone应用程序中，我一直使用以下功能来horizontally mirror图片.
In my iPhone app, I've always used the following function to horizontally mirror an image.
-(UIImage*)mirrorImage:(UIImage*)img
{
CIImage *coreImage = [CIImage imageWithCGImage:img.CGImage];
coreImage = [coreImage imageByApplyingTransform:CGAffineTransformMakeScale(-1, 1)];
img = [UIImage imageWithCIImage:coreImage scale:img.scale orientation:UIImageOrientationUp];
return img;
}
尽管在iOS 10.0.1中，此功能仍然可以正常运行，但是当我尝试使用此功能中的UIImage时，会出现以下警告，并且图像似乎不存在. /p>
With iOS 10.0.1 though, this function still runs with no errors, but when I try to use the UIImage from this function, the following warning appears, and the image just doesn't seem to be there.
Failed to render 921600 pixels because a CIKernel's ROI function did not allow tiling.
当我尝试使用 UIImage(在此代码的第二行)时，此错误实际上出现在输出"窗口中:
This error actually appears in the Output window when I attempt to use the UIImage (in the second line in this code) :
UIImage* flippedImage = [self mirrorImage:originalImage];
UIImageView* photo = [[UIImageView alloc] initWithImage:flippedImage];
在调用mirrorImage之后，flippedImage变量确实包含一个值，它不是nil，但是当我尝试使用该图像时，会收到该错误消息.
After calling mirrorImage, the flippedImage variable does contain a value, it's not nil, but when I try to use the image, I get that error message.
如果我不调用 mirrorImage函数，那么代码可以正常工作:
If I were to not call the mirrorImage function, then the code works fine:
UIImageView* photo = [[UIImageView alloc] initWithImage:originalImage];
使用iOS 10是否有一些新问题会阻止我的mirrorImage函数正常工作?
Is there some new quirk with iOS 10 which would prevent my mirrorImage function from working ?
只需在mirrorImage函数中添加，我尝试在转换之前和之后测试图像的大小(因为错误抱怨必须tile图像)，并且大小是相同的. /p>
Just to add, in the mirrorImage function, I tried testing the size of the image before and after the transformation (as the error is complaining about having to tile the image), and the size is identical.
推荐答案
我通过转换CIImage-> CGImage-> UIImage
I fixed it by converting CIImage -> CGImage -> UIImage
let ciImage: CIImage = "myCIImageFile"
let cgImage: CGImage = {
let context = CIContext(options: nil)
return context.createCGImage(ciImage, from: ciImage.extent)!
}()
let uiImage = UIImage(cgImage: cgImage)
这篇关于iOS 10:CIKernel的ROI功能不允许平铺的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！