ios开发 上传图片颠倒问题

曾遇到这样的一个问题,  自己上传到服务器的图片, 在请求回来莫名奇妙的就会颠倒了

解决办法只需要, 在图片上传之前, 做一下处理就可以了

//图片处理,此方法解决了, (手机竖屏拍照,图片会横倒的问题)

- (UIImage *)fixOrientation:(UIImage *)aImage {

    if (aImage.imageOrientation ==UIImageOrientationUp)

        return aImage;

    CGAffineTransform transform =CGAffineTransformIdentity;

    

    switch (aImage.imageOrientation) {

        case UIImageOrientationDown:

        case UIImageOrientationDownMirrored:

            transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);

            transform = CGAffineTransformRotate(transform,M_PI);

            break;

            

        case UIImageOrientationLeft:

        case UIImageOrientationLeftMirrored:

            transform = CGAffineTransformTranslate(transform, aImage.size.width,0);

            transform = CGAffineTransformRotate(transform,M_PI_2);

            break;

            

        case UIImageOrientationRight:

        case UIImageOrientationRightMirrored:

            transform = CGAffineTransformTranslate(transform,0, aImage.size.height);

            transform = CGAffineTransformRotate(transform, -M_PI_2);

            break;

        default:

            break;

    }

    

    switch (aImage.imageOrientation) {

        case UIImageOrientationUpMirrored:

        case UIImageOrientationDownMirrored:

            transform = CGAffineTransformTranslate(transform, aImage.size.width,0);

            transform = CGAffineTransformScale(transform, -1,1);

            break;

            

        case UIImageOrientationLeftMirrored:

        case UIImageOrientationRightMirrored:

            transform = CGAffineTransformTranslate(transform, aImage.size.height,0);

            transform = CGAffineTransformScale(transform, -1,1);

            break;

        default:

            break;

    }

    CGContextRef ctx =CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,

                                             CGImageGetBitsPerComponent(aImage.CGImage),0,

                                             CGImageGetColorSpace(aImage.CGImage),

                                             CGImageGetBitmapInfo(aImage.CGImage));

    CGContextConcatCTM(ctx, transform);

    switch (aImage.imageOrientation) {

        case UIImageOrientationLeft:

        case UIImageOrientationLeftMirrored:

        case UIImageOrientationRight:

        case UIImageOrientationRightMirrored:

            // Grr...

            CGContextDrawImage(ctx,CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);

            break;

            

        default:

            CGContextDrawImage(ctx,CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);

            break;

    }

    

    // And now we just create a new UIImage from the drawing context

    CGImageRef cgimg =CGBitmapContextCreateImage(ctx);

    UIImage *img = [UIImageimageWithCGImage:cgimg];

    CGContextRelease(ctx);

    CGImageRelease(cgimg);

    return img;

}