Swift UIImage在剪切后旋转

我有一个类设置，允许用户从他们的库中添加图像，裁剪并保存

该代码设置为，如果检索到的图像是纵向的，则在裁剪之前会向所有图像显示纵向形状的边框以对齐，如果是横向的，则会显示景观边框

如果选择的图像是规则形状的图像，则所有图像都可以正常工作。但是，如果检索到的图像是纵向的，并且不是规则的比例（意味着更接近正方形，而实际上不是正方形），则图像在被裁剪后会旋转。系统似乎将其视为一幅风景画

这是一个收割前和收割后的示例。即使我放大并使图像覆盖整个屏幕，它也会旋转图像：

<代码>导入基础 导入UIKit 类SelectImageViewController:UIViewController、UIImagePickerControllerDelegate、UINavigationControllerDelegate、UIScrollViewDelegate{ @IBVAR imageView:UIImageView！ @IBOutlet弱var imageConstraintTop:NSLayoutConstraint！ @IBOutlet弱var ImageConstraintTright:NSLayoutConstraint！ @IBOutlet弱var imageConstraintLeft:NSLayoutConstraint！ @IBOutlet弱var imageConstraintBottom:NSLayoutConstraint！ var lastZoomScale:CGFloat=-1 var imageName:String=“” var userPhotoUUID=UUID（）.uuidString 让userDefault=UserDefaults.standard var userDatabase:userDatabase=userDatabase（） 让picker=UIImagePickerController（） @iBCROLLVIEW:UIScrollView{ 迪塞特{ scrollView.delegate=self scrollView.minimumZoomScale=1.0 scrollView.maximumZoomScale=5.0 } } @IBOutlet弱var比率选择器：UISegmentedControl！ @IBVAR CROPERAVIEWL:CROPERAVIEWL！ 变量：CGRect{ 得到{ 让因子=imageView.image！.size.width/view.frame.width 让比例=1/scrollView.zoomScale 让imageFrame=imageView.imageFrame（） 设x=（scrollView.contentOffset.x+cropAreaViewL.frame.origin.x-imageFrame.origin.x）*比例系数* 设y=（scrollView.contentOffset.y+cropAreaViewL.frame.origin.y-imageFrame.origin.y）*比例系数* let width=cropAreaViewL.frame.size.width*比例系数 let height=cropAreaViewL.frame.size.height*比例系数 返回CGRect（x:x，y:y，宽度：宽度，高度：高度） } } @IBOUTLE var cropAreaViewP:cropAreaViewP！ 变量cropAreaP:CGRect{ 得到{ 让因子=imageView.image！.size.height/view.frame.height 让比例=1/scrollView.zoomScale 让imageFrame=imageView.imageFrame（） 设x=（scrollView.contentOffset.x+cropAreaViewP.frame.origin.x-imageFrame.origin.x）*比例系数* 设y=（scrollView.contentOffset.y+cropAreaViewP.frame.origin.y-imageFrame.origin.y）*比例系数* let width=cropAreaViewP.frame.size.width*比例系数 let height=cropAreaViewP.frame.size.height*比例系数 返回CGRect（x:x，y:y，宽度：宽度，高度：高度） } } fileprivate var speciePhotos:Array=[SpeciePhotoModel]（） func随机数（范围：ClosedRange=30000…99998）->Int{ 设最小值=range.lowerBound 设max=range.upperBound 返回Int（arc4random_uniform（UInt32（1+max-min）））+min } 重写func viewDidLoad（）{ super.viewDidLoad（） navigationItem.rightBarButtonItem=UIBarButtonItem（标题：“+”，样式：。普通，目标：self，操作：#选择器（SelectImageViewController.add（：）） 设id=randomNumber（） userDefault.set（id，forKey：“photoID”） self.cropAreaViewP.ishiden=true self.croparaviewl.ishiden=true self.cropAreaViewL.layer.borderColor=（UIColor.red）.cgColor self.cropAreaViewL.layer.borderWidth=1.0 self.cropAreaViewP.layer.borderColor=（UIColor.red）.cgColor self.cropAreaViewP.layer.borderWidth=1.0 self.add.layer.cornerRadius=6.0 self.ratioSelector.layer.cornerRadius=6.0 self.tabBar控制器？.tabBar.ishiden=true self.add.ishiden=true self.ratioSelector.ishiden=true updateZoom（） } func updateConstraints（）{ 如果让image=imageView.image{ 设imageWidth=image.size.width 让imageHeight=image.size.height 让viewWidth=scrollView.bounds.size.width 让viewHeight=scrollView.bounds.size.height //如果图像小于滚动视图，则居中显示 var hPadding=（viewWidth-scrollView.zoomScale*imageWidth）/2 如果hPadding<0{hPadding=0} var vPadding=（viewHeight-scrollView.zoomScale*imageHeight）/2 如果vPadding<0{vPadding=0} imageConstraintLeft.constant=hPadding ImageConstraintTright.constant=hPadding imageConstraintTop.constant=vPadding imageConstraintBottom.constant=vPadding view.layoutIfNeeded（） } } fileprivate func updateZoom（）{ 如果让image=imageView.image{ var minZoom=min（scrollView.bounds.size.width/image.size.width， scrollView.bounds.size.height/image.size.height） 如果最小缩放>1{minZoom=1} scrollView.minimumZoomScale=0.3*最小缩放 //如果缩放未更改，则强制scrollViewDidZoom启动 如果minZoom==lastZoomScale{minZoom+=0.000001} scrollView.zoomScale=minZoom lastZoomScale=最小缩放 } } @iAction func比率选择器（\发送方：AnyObject）{ 开关比率选择器。selectedSegmentIndex { 案例0://景观 self.croperaviewp.ishiden=tr

import Foundation
import UIKit

class SelectImageViewController: UIViewController, UIImagePickerControllerDelegate,UINavigationControllerDelegate,UIScrollViewDelegate{


    @IBOutlet weak var imageView: UIImageView!

    @IBOutlet weak var imageConstraintTop: NSLayoutConstraint!
    @IBOutlet weak var imageConstraintRight: NSLayoutConstraint!
    @IBOutlet weak var imageConstraintLeft: NSLayoutConstraint!
    @IBOutlet weak var imageConstraintBottom: NSLayoutConstraint!

    var lastZoomScale: CGFloat = -1
    var imageName: String = ""
    var userPhotoUUID = UUID().uuidString
    let userDefault = UserDefaults.standard
    var userDatabase: UserDatabase = UserDatabase()
    let picker = UIImagePickerController()


    @IBOutlet var scrollView: UIScrollView!{
        didSet{
            scrollView.delegate = self
            scrollView.minimumZoomScale = 1.0
            scrollView.maximumZoomScale = 5.0
        }
    }

    @IBOutlet weak var ratioSelector: UISegmentedControl!

    @IBOutlet var cropAreaViewL: CropAreaViewL!

    var cropAreaL:CGRect{
        get{
            let factor = imageView.image!.size.width/view.frame.width
            let scale = 1/scrollView.zoomScale
            let imageFrame = imageView.imageFrame()
            let x = (scrollView.contentOffset.x + cropAreaViewL.frame.origin.x - imageFrame.origin.x) * scale * factor
            let y = (scrollView.contentOffset.y + cropAreaViewL.frame.origin.y - imageFrame.origin.y) * scale * factor
            let width = cropAreaViewL.frame.size.width * scale * factor
            let height = cropAreaViewL.frame.size.height * scale * factor
            return CGRect(x: x, y: y, width: width, height: height)
        }
    }

    @IBOutlet var cropAreaViewP: CropAreaViewP!

    var cropAreaP:CGRect{
        get{
            let factor = imageView.image!.size.height/view.frame.height
            let scale = 1/scrollView.zoomScale
            let imageFrame = imageView.imageFrame()
            let x = (scrollView.contentOffset.x + cropAreaViewP.frame.origin.x - imageFrame.origin.x) * scale * factor
            let y = (scrollView.contentOffset.y + cropAreaViewP.frame.origin.y - imageFrame.origin.y) * scale * factor
            let width = cropAreaViewP.frame.size.width * scale * factor
            let height = cropAreaViewP.frame.size.height * scale * factor
            return CGRect(x: x, y: y, width: width, height: height)
        }
    }


    fileprivate var speciePhotos: Array<SpeciePhotoModel> = [SpeciePhotoModel]()


    func randomNumber(range: ClosedRange<Int> = 30000...99998) -> Int {
        let min = range.lowerBound
        let max = range.upperBound
        return Int(arc4random_uniform(UInt32(1 + max - min))) + min
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "+", style: .plain, target: self, action: #selector(SelectImageViewController.add(_:)))

        let id = randomNumber()
        userDefault.set(id, forKey: "photoID")

        self.cropAreaViewP.isHidden = true
        self.cropAreaViewL.isHidden = true
        self.cropAreaViewL.layer.borderColor = (UIColor.red).cgColor
        self.cropAreaViewL.layer.borderWidth = 1.0
        self.cropAreaViewP.layer.borderColor = (UIColor.red).cgColor
        self.cropAreaViewP.layer.borderWidth = 1.0
        self.add.layer.cornerRadius = 6.0
        self.ratioSelector.layer.cornerRadius = 6.0
        self.tabBarController?.tabBar.isHidden = true
        self.add.isHidden = true
        self.ratioSelector.isHidden = true

        updateZoom()

    }


    func updateConstraints() {
        if let image = imageView.image {
            let imageWidth = image.size.width
            let imageHeight = image.size.height

            let viewWidth = scrollView.bounds.size.width
            let viewHeight = scrollView.bounds.size.height

            // center image if it is smaller than the scroll view
            var hPadding = (viewWidth - scrollView.zoomScale * imageWidth) / 2
            if hPadding < 0 { hPadding = 0 }

            var vPadding = (viewHeight - scrollView.zoomScale * imageHeight) / 2
            if vPadding < 0 { vPadding = 0 }

            imageConstraintLeft.constant = hPadding
            imageConstraintRight.constant = hPadding

            imageConstraintTop.constant = vPadding
            imageConstraintBottom.constant = vPadding

            view.layoutIfNeeded()
        }
    }

    fileprivate func updateZoom() {
        if let image = imageView.image {
            var minZoom = min(scrollView.bounds.size.width / image.size.width,
                              scrollView.bounds.size.height / image.size.height)

            if minZoom > 1 { minZoom = 1 }

            scrollView.minimumZoomScale = 0.3 * minZoom

            // Force scrollViewDidZoom fire if zoom did not change
            if minZoom == lastZoomScale { minZoom += 0.000001 }

            scrollView.zoomScale = minZoom
            lastZoomScale = minZoom
        }
    }


    @IBAction func ratioSelector(_ sender: AnyObject) {

        switch ratioSelector.selectedSegmentIndex
        {
        case 0:// Landscape

            self.cropAreaViewP.isHidden = true
            self.cropAreaViewL.isHidden = false

        case 1: // Portrait

            self.cropAreaViewL.isHidden = true
            self.cropAreaViewP.isHidden = false

        default:
            break; 
        } 
    }


    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        dismiss(animated: true, completion: nil)
    }

    @IBOutlet weak var add : UIButton!


    @IBAction func add(_ sender: UIButton) {

        imageView.image = nil

        let picker = UIImagePickerController()
        picker.delegate = self
        picker.sourceType = .photoLibrary
        picker.allowsEditing = false
        self.present(picker, animated: true, completion: nil)

        self.ratioSelector.isHidden = false
        self.add.isHidden = false

        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Crop", style: .plain, target: self, action: #selector(SelectImageViewController.crop(_:)))

    }

    @IBAction func change(_ sender: UIButton) {

        imageView.image = nil

        let picker = UIImagePickerController()
        picker.delegate = self
        picker.sourceType = .photoLibrary
        picker.allowsEditing = false
        self.present(picker, animated: true, completion: nil)

        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Crop", style: .plain, target: self, action: #selector(SelectImageViewController.crop(_:)))

    }


    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

        let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage

        if chosenImage.size.height > chosenImage.size.width
        {
            self.cropAreaViewL.isHidden = true
            self.cropAreaViewP.isHidden = false
            self.ratioSelector.selectedSegmentIndex = 1
            imageView.image = chosenImage
        }
        else
        {
            self.cropAreaViewP.isHidden = true
            self.cropAreaViewL.isHidden = false
            self.ratioSelector.selectedSegmentIndex = 0
            imageView.image = chosenImage
        }
        self.dismiss(animated: true, completion: nil)
    }


    @IBAction func crop(_ sender: UIButton) {

        if cropAreaViewP.isHidden == true {
            self.cropAreaViewL.layer.borderColor = (UIColor.clear).cgColor
            let croppedCGImage = imageView.image?.cgImage?.cropping(to: cropAreaL)
            let croppedImage = UIImage(cgImage: croppedCGImage!)
            imageView.image = croppedImage
            scrollView.zoomScale = 1
        } else {
            self.cropAreaViewP.layer.borderColor = (UIColor.clear).cgColor
            let croppedCGImage = imageView.image?.cgImage?.cropping(to: cropAreaP)
            let croppedImage = UIImage(cgImage: croppedCGImage!)
            imageView.image = croppedImage
            scrollView.zoomScale = 1
        }

        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Next", style: .plain, target: self, action: #selector(SelectImageViewController.saveButtonAction(_:)))


    }
}

extension UIImageView{
    func imageFrame()->CGRect{
        let imageViewSize = self.frame.size
        guard let imageSize = self.image?.size else{return CGRect.zero}
        let imageRatio = imageSize.width / imageSize.height
        let imageViewRatio = imageViewSize.width / imageViewSize.height

        if imageRatio < imageViewRatio { // Portrait
            let scaleFactor = imageViewSize.height / imageSize.height
            let width = imageSize.width * scaleFactor
            let topLeftX = (imageViewSize.width - width) * 0.5
            return CGRect(x: topLeftX, y: 0, width: width, height: imageViewSize.height)
        }else{  // Landscape
            let scaleFactor = imageViewSize.width / imageSize.width
            let height = imageSize.height * scaleFactor
            let topLeftY = (imageViewSize.height - height) * 0.5
            return CGRect(x: 0, y: topLeftY, width: imageViewSize.width, height: height)
        }
    }
}


class CropAreaViewL: UIView {

    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        return false
    }
}

class CropAreaViewP: UIView {

    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        return false
    }

}

let vPadding = max((viewHeight - scrollView.zoomScale * imageHeight) / 2, 0)

extension UIImage {

    var isPortrait:  Bool    { return size.height > size.width }
    var isLandscape: Bool    { return size.width > size.height }
    var breadth:     CGFloat { return min(size.width, size.height) }
    var breadthSize: CGSize  { return CGSize(width: breadth, height: breadth) }
    var squared: UIImage? {
        guard let cgImage = cgImage?.cropping(to:
            CGRect(origin: CGPoint(x: isLandscape ? floor((size.width-size.height)/2) : 0, y: isPortrait  ? floor((size.height-size.width)/2) : 0),
                   size: breadthSize)) else { return nil }
        return UIImage(cgImage: cgImage)
    }
}

let profilePicture = UIImage(data: try! Data(contentsOf: URL(string:"https://i.stack.imgur.com/Xs4RX.jpg")!))!
if let squared = profilePicture.squared {
    squared

}