iOS 图像处理－剪裁图像

来源：互联网发布：arm-linux-gcc下载编辑：程序博客网时间：2024/05/14 12:25

解决问题：按照某一长宽比例，剪裁图片的上部和下部，保留中间的内容。当然也可以自定义需要剪裁留下的区域

前提：需要添加Framework：CoreGraphics.framework

代码：

- (UIImage*) crop:(UIImage*)theImage{    // Get size of current image    CGSize size = [theImage size];        // Create rectangle that represents a cropped image    CGFloat desiredRatio = 1.2;        CGFloat croppedWidth = 0.0;    CGFloat croppedHeight = 0.0;    CGRect rect;        if (size.height/size.width >= desiredRatio) {        croppedWidth = size.width;        croppedHeight = size.width * desiredRatio;        CGFloat difference = (size.height-croppedHeight)/2;        rect = CGRectMake(0.0, difference ,croppedWidth, croppedHeight);    }    else{        return theImage;    }        // Create bitmap image from original image data,    // using rectangle to specify desired crop area    CGImageRef imageRef = CGImageCreateWithImageInRect([theImage CGImage], rect);    UIImage *croppedImage = [UIImage imageWithCGImage:imageRef];    CGImageRelease(imageRef);    return croppedImage;}

参考：网上资源，链接已丢失

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