如何快速裁剪图​​像 [英] How to crop an image in swift

问题描述

我想从相机中裁剪图像.相机预览中应该有一个矩形边框，结果将是裁剪后的图像，如下例所示:

I want to crop an image from camera. There should be a rectangle border in the camera preview and the result will be the cropped image, like this example:

推荐答案

组合苹果的开发人员文档，其中 Pranavan Sp 弃用了答案，您将得到:/p>

Combining Apple's developer documentation with the deprecated answer by Pranavan Sp to skip the bells and whistles, you would get:

extension UIImage {

    func cropToRect(rect: CGRect!) -> UIImage? {

        let scaledRect = CGRect(x: rect.origin.x * self.scale, y: rect.origin.y * self.scale, width: rect.size.width * self.scale, height: rect.size.height * self.scale);


        guard let imageRef: CGImage = self.cgImage?.cropping(to:scaledRect)
        else {
            return nil
        }

        let croppedImage: UIImage = UIImage(cgImage: imageRef, scale: self.scale, orientation: self.imageOrientation)
        return croppedImage
    }
}

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