xcode swift如何拆分图像？ [英] xcode swift how do I split an image?

问题描述

我正在使用Swift 2.0，我想将图像分成多个部分。我知道这是一个重复，但他们的语法很老，我无法更新。

I am working with Swift 2.0 and I would like to split an image into multiple pieces. I know this is a repeat, but they syntax is old and I am having trouble update.

推荐答案

更新： Xcode 8.2.1•Swift 3.0.2

您可以添加此扩展程序以拆分图片：

You can add this extension to split your images:

extension UIImage {
    var topHalf: UIImage? {
        guard let cgImage = cgImage, let image = cgImage.cropping(to: CGRect(origin: .zero, size: CGSize(width: size.width, height: size.height/2))) else { return nil }
        return UIImage(cgImage: image, scale: 1, orientation: imageOrientation)
    }
    var bottomHalf: UIImage? {
        guard let cgImage = cgImage, let image = cgImage.cropping(to: CGRect(origin: CGPoint(x: 0,  y: CGFloat(Int(size.height)-Int(size.height/2))), size: CGSize(width: size.width, height: CGFloat(Int(size.height) - Int(size.height/2))))) else { return nil }
        return UIImage(cgImage: image)
    }
    var leftHalf: UIImage? {
        guard let cgImage = cgImage, let image = cgImage.cropping(to: CGRect(origin: .zero, size: CGSize(width: size.width/2, height: size.height))) else { return nil }
        return UIImage(cgImage: image)
    }
    var rightHalf: UIImage? {
        guard let cgImage = cgImage, let image = cgImage.cropping(to: CGRect(origin: CGPoint(x: CGFloat(Int(size.width)-Int((size.width/2))), y: 0), size: CGSize(width: CGFloat(Int(size.width)-Int((size.width/2))), height: size.height)))
            else { return nil }
        return UIImage(cgImage: image)
    }
}

用法：

if let imageURL = URL(string: "https://i.stack.imgur.com/Xs4RX.jpg"),
    let data = try? Data(contentsOf: imageURL),
    let image = UIImage(data: data) {

    let topHalf = image.topHalf
    let bottomHalf = image.bottomHalf

    let topLeft = topHalf?.leftHalf
    let topRight = topHalf?.rightHalf
    let bottomLeft = bottomHalf?.leftHalf
    let bottomRight = bottomHalf?.rightHalf
}

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