xcode 将 UIImage 分成两半？
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Split UIImage in half?
提问by Shredder2794
How would I go about splitting a UIImage In half(down the middle) so it would make two images?
我将如何将 UIImage 分成两半（中间），以便制作两个图像？
回答by xda1001
You can try this,
你可以试试这个
UIImage *image = [UIImage imageNamed:@"yourImage.png"];
CGImageRef tmpImgRef = image.CGImage;
CGImageRef topImgRef = CGImageCreateWithImageInRect(tmpImgRef, CGRectMake(0, 0, image.size.width, image.size.height / 2.0));
UIImage *topImage = [UIImage imageWithCGImage:topImgRef];
CGImageRelease(topImgRef);
CGImageRef bottomImgRef = CGImageCreateWithImageInRect(tmpImgRef, CGRectMake(0, image.size.height / 2.0, image.size.width, image.size.height / 2.0));
UIImage *bottomImage = [UIImage imageWithCGImage:bottomImgRef];
CGImageRelease(bottomImgRef);
hope this can help you, :)
希望这可以帮到你， ：）
回答by Durul Dalkanat
- (void)splitImage:(UIImage *)image
{
CGFloat imgWidth = image.size.width/2;
CGFloat imgheight = image.size.height;
CGRect leftImgFrame = CGRectMake(0, 0, imgWidth, imgheight);
CGRect rightImgFrame = CGRectMake(imgWidth, 0, imgWidth, imgheight);
CGImageRef left = CGImageCreateWithImageInRect(image.CGImage, leftImgFrame);
CGImageRef right = CGImageCreateWithImageInRect(image.CGImage, rightImgFrame);
// These are the images we want!
UIImage *leftImage = [UIImage imageWithCGImage:left];
UIImage *rightImage = [UIImage imageWithCGImage:right];
// Don't forget to free the memory!
CGImageRelease(left);
CGImageRelease(right);
}
回答by user3069232
iOS 11, swift 4.0 updated version https://stackoverflow.com/users/893872/durul-dalkanatwhich I think to be honest is the best :)
iOS 11，swift 4.0 更新版本https://stackoverflow.com/users/893872/durul-dalkanat我认为老实说是最好的:)
This splits an image into 4 parts
这将图像分成 4 部分
func splitImage(image2D: UIImage) -> [UIImage] {
let imgWidth = image2D.size.width / 2
let imgHeight = image2D.size.height / 2
var imgImages:[UIImage] = []
let leftHigh = CGRect(x: 0, y: 0, width: imgWidth, height: imgHeight)
let rightHigh = CGRect(x: imgWidth, y: 0, width: imgHeight, height: imgHeight)
let leftLow = CGRect(x: 0, y: imgHeight, width: imgWidth, height: imgHeight)
let rightLow = CGRect(x: imgWidth, y: imgHeight, width: imgWidth, height: imgHeight)
let leftQH = image2D.cgImage?.cropping(to:leftHigh)
let rightHQ = image2D.cgImage?.cropping(to:rightHigh)
let leftQL = image2D.cgImage?.cropping(to:leftLow)
let rightQL = image2D.cgImage?.cropping(to:rightLow)
imgImages.append(UIImage(cgImage: leftQH!))
imgImages.append(UIImage(cgImage: rightHQ!))
imgImages.append(UIImage(cgImage: leftQL!))
imgImages.append(UIImage(cgImage: rightQL!))
return imgImages
}
