使用imagePicker时ImageView旋转 [英] ImageView rotating when using imagePicker

问题描述

我有一个表格视图，并且在单元格中有一个图像和2个标签.我正在使用imagePicker从相机胶卷中选择一张照片，并将该照片放入单元格图像中.但是，当照片是人像模式照片时，图像将旋转90度.

I have a table view and in the cell, there is an image and 2 labels. I am using imagePicker to choose a photo from my camera roll and putting that photo into the cell image. However, when the photo is a portrait mode photo, the image is rotated 90 degrees.

在下面的代码中，发布是一个连接到表视图单元格中的imageview的插座，我初始化了UIImagePickerController.

In the code below, posting is an outlet that connects to the imageview in the table view cell and I initialized a UIImagePickerController.

class MakePostVC: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

@IBOutlet weak var postImg: UIImageView!
@IBOutlet weak var postTitle: UITextField!
@IBOutlet weak var postDescrip: UITextField!

var imgPicker: UIImagePickerController!

override func viewDidLoad() {
    super.viewDidLoad()

    postImg.layer.cornerRadius = 30
    postImg.clipsToBounds = true

    imgPicker = UIImagePickerController()
    imgPicker.delegate = self

}

这是我对didFinishPickingImage的功能:

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
    imgPicker.dismissViewControllerAnimated(true, completion: nil)
    postImg.image = image
}

我在SO上看过类似的帖子，但是解决方案似乎不起作用.
有什么建议吗?

I've looked at similar posts here on SO but the solutions don't seem to work.
Any suggestions?

谢谢

推荐答案

已更新至Swift 5.3，iOS 14

Sunil Sharma的解决方案为我工作.这是 Swift 5

extension UIImage {
    var fixedOrientation: UIImage {
        guard imageOrientation != .up else { return self }
        
        var transform: CGAffineTransform = .identity
        switch imageOrientation {
        case .down, .downMirrored:
            transform = transform
                .translatedBy(x: size.width, y: size.height).rotated(by: .pi)
        case .left, .leftMirrored:
            transform = transform
                .translatedBy(x: size.width, y: 0).rotated(by: .pi)
        case .right, .rightMirrored:
            transform = transform
                .translatedBy(x: 0, y: size.height).rotated(by: -.pi/2)
        case .upMirrored:
            transform = transform
                .translatedBy(x: size.width, y: 0).scaledBy(x: -1, y: 1)
        default:
            break
        }
        
        guard
            let cgImage = cgImage,
            let colorSpace = cgImage.colorSpace,
            let context = CGContext(
                data: nil, width: Int(size.width), height: Int(size.height),
                bitsPerComponent: cgImage.bitsPerComponent, bytesPerRow: 0,
                space: colorSpace, bitmapInfo: cgImage.bitmapInfo.rawValue
            )
        else { return self }
        context.concatenate(transform)
        
        var rect: CGRect
        switch imageOrientation {
        case .left, .leftMirrored, .right, .rightMirrored:
            rect = CGRect(x: 0, y: 0, width: size.height, height: size.width)
        default:
            rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
        }
        
        context.draw(cgImage, in: rect)
        return context.makeImage().map { UIImage(cgImage: $0) } ?? self
    }
}

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