Question

我有一个表视图，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，当照片是肖像模式照片时，图像会旋转90度。

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

}

以下是我didFinishPickingImage的功能：

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

我已经在SO上查看了类似的帖子，但解决方案似乎不起作用。
有什么建议吗？

由于

Answer 1

UIImage包含一个名为imageOrientation的属性。由于Apple文档中描述了此属性：

图像方向会影响图像数据的显示方式画。默认情况下，图像以“向上”方向显示。如果但是，图像具有关联的元数据（例如EXIF信息）此属性包含元数据指示的方向。

因此，此属性用于反映相机相对于地面的位置。因此，当您从手机相机拍摄图像时，它会将方向标记保存在UIImage imageOrientation属性中。
在显示是否忽略此属性时，您可能无法找到正确方向的图像。仅供参考，请参阅下图，相机如何拍摄图像然后进行编码和显示。有关详细信息，请查看此link。

在ios中修复此问题的目标C

制作类别

<强>的UIImage + fixOrientation.h

@interface UIImage (fixOrientation) - (UIImage *)fixOrientation; @end

<强>的UIImage + fixOrientation.m

@implementation UIImage (fixOrientation) - (UIImage *)fixOrientation { // No-op if the orientation is already correct if (self.imageOrientation == UIImageOrientationUp) return self; // We need to calculate the proper transformation to make the image upright. // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored. CGAffineTransform transform = CGAffineTransformIdentity; switch (self.imageOrientation) { case UIImageOrientationDown: case UIImageOrientationDownMirrored: transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height); transform = CGAffineTransformRotate(transform, M_PI); break; case UIImageOrientationLeft: case UIImageOrientationLeftMirrored: transform = CGAffineTransformTranslate(transform, self.size.width, 0); transform = CGAffineTransformRotate(transform, M_PI_2); break; case UIImageOrientationRight: case UIImageOrientationRightMirrored: transform = CGAffineTransformTranslate(transform, 0, self.size.height); transform = CGAffineTransformRotate(transform, -M_PI_2); break; case UIImageOrientationUp: case UIImageOrientationUpMirrored: break; } switch (self.imageOrientation) { case UIImageOrientationUpMirrored: case UIImageOrientationDownMirrored: transform = CGAffineTransformTranslate(transform, self.size.width, 0); transform = CGAffineTransformScale(transform, -1, 1); break; case UIImageOrientationLeftMirrored: case UIImageOrientationRightMirrored: transform = CGAffineTransformTranslate(transform, self.size.height, 0); transform = CGAffineTransformScale(transform, -1, 1); break; case UIImageOrientationUp: case UIImageOrientationDown: case UIImageOrientationLeft: case UIImageOrientationRight: break; } // Now we draw the underlying CGImage into a new context, applying the transform // calculated above. CGContextRef ctx = CGBitmapContextCreate(NULL, self.size.width, self.size.height, CGImageGetBitsPerComponent(self.CGImage), 0, CGImageGetColorSpace(self.CGImage), CGImageGetBitmapInfo(self.CGImage)); CGContextConcatCTM(ctx, transform); switch (self.imageOrientation) { case UIImageOrientationLeft: case UIImageOrientationLeftMirrored: case UIImageOrientationRight: case UIImageOrientationRightMirrored: // Grr... CGContextDrawImage(ctx, CGRectMake(0,0,self.size.height,self.size.width), self.CGImage); break; default: CGContextDrawImage(ctx, CGRectMake(0,0,self.size.width,self.size.height), self.CGImage); break; } // And now we just create a new UIImage from the drawing context CGImageRef cgimg = CGBitmapContextCreateImage(ctx); UIImage *img = [UIImage imageWithCGImage:cgimg]; CGContextRelease(ctx); CGImageRelease(cgimg); return img; } @end

<强>夫特

将扩展程序设为

extension UIImage { func fixOrientation() -> UIImage { // No-op if the orientation is already correct if ( self.imageOrientation == UIImageOrientation.Up ) { return self; } // We need to calculate the proper transformation to make the image upright. // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored. var transform: CGAffineTransform = CGAffineTransformIdentity if ( self.imageOrientation == UIImageOrientation.Down || self.imageOrientation == UIImageOrientation.DownMirrored ) { transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height) transform = CGAffineTransformRotate(transform, CGFloat(M_PI)) } if ( self.imageOrientation == UIImageOrientation.Left || self.imageOrientation == UIImageOrientation.LeftMirrored ) { transform = CGAffineTransformTranslate(transform, self.size.width, 0) transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2)) } if ( self.imageOrientation == UIImageOrientation.Right || self.imageOrientation == UIImageOrientation.RightMirrored ) { transform = CGAffineTransformTranslate(transform, 0, self.size.height); transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2)); } if ( self.imageOrientation == UIImageOrientation.UpMirrored || self.imageOrientation == UIImageOrientation.DownMirrored ) { transform = CGAffineTransformTranslate(transform, self.size.width, 0) transform = CGAffineTransformScale(transform, -1, 1) } if ( self.imageOrientation == UIImageOrientation.LeftMirrored || self.imageOrientation == UIImageOrientation.RightMirrored ) { transform = CGAffineTransformTranslate(transform, self.size.height, 0); transform = CGAffineTransformScale(transform, -1, 1); } // Now we draw the underlying CGImage into a new context, applying the transform // calculated above. let ctx: CGContextRef = CGBitmapContextCreate(nil, Int(self.size.width), Int(self.size.height), CGImageGetBitsPerComponent(self.CGImage), 0, CGImageGetColorSpace(self.CGImage), CGImageGetBitmapInfo(self.CGImage).rawValue)!; CGContextConcatCTM(ctx, transform) if ( self.imageOrientation == UIImageOrientation.Left || self.imageOrientation == UIImageOrientation.LeftMirrored || self.imageOrientation == UIImageOrientation.Right || self.imageOrientation == UIImageOrientation.RightMirrored ) { CGContextDrawImage(ctx, CGRectMake(0,0,self.size.height,self.size.width), self.CGImage) } else { CGContextDrawImage(ctx, CGRectMake(0,0,self.size.width,self.size.height), self.CGImage) } // And now we just create a new UIImage from the drawing context and return it return UIImage(CGImage: CGBitmapContextCreateImage(ctx)!) } }

Answer 2

Sunil Sharma的解决方案为我工作。这是 Swift 4

的翻译版本

import UIKit
import CoreGraphics

extension UIImage {

    func fixOrientation() -> 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 = 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)
        guard let image = context.makeImage() else { return self }
        return UIImage(cgImage: image)
    }

}

Answer 3

你可以像这篇文章一样旋转图像： https://stackoverflow.com/a/1317194/3928412

你也需要让设备旋转，你可以得到它：

 UIDevice.currentDevice().orientation

ImageView在使用imagePicker时旋转

3 个答案: