didFinishPickingMediaWithInfo 方向问题答案

【问题标题】：didFinishPickingMediaWithInfo orientation issuedidFinishPickingMediaWithInfo 方向问题
【发布时间】：2013-05-07 07:46:09
【问题描述】：

我正在尝试在imagePickerController:didFinishPickingMediaWithInfo 中管理图像旋转，但经过多次尝试，我没有找到任何解决方案。我的最后一次尝试是：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

        // load the storyboard by name
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:[ApplicationSupport getStoryBoardName] bundle:nil];
        UploadViewController *uploadView = [storyboard instantiateViewControllerWithIdentifier:@"ViewUploadFile"];

        UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
        NSDictionary *metadataImage = [info valueForKey:UIImagePickerControllerMediaMetadata];

        uploadView.imageToUpload = image;

        if([[metadataImage objectForKey:@"Orientation"] intValue] == 3) {
            UIImage *imageRotated = [UIImage imageWithCGImage:[image CGImage] scale:[image scale] orientation:UIImageOrientationDown];
            uploadView.dataToUpload = UIImagePNGRepresentation(imageRotated);
        } else {
            uploadView.dataToUpload = UIImagePNGRepresentation(image);
        }

        // ETC...
    }

我不能也不想使用JPEGRepresentation。当 iPad 处于特定位置时，我需要将照片旋转 180°。

有什么想法吗？

【问题讨论】：

您是否尝试过使用 UIImageOrientationLeft 或 UIImageOrientationRight 而不是 Dowm。它会旋转吗？
经过几次尝试，我明白我不想改变方向“标志”。我需要“物理”旋转我的图像。所以我尝试了这个：UIGraphicsBeginImageContext(image.size); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextRotateCTM(context, (90 * M_PI / 180)); [image drawAtPoint:CGPointMake(0, 0)]; UIImage *imageRotated = UIGraphicsGetImageFromCurrentImageContext(); uploadView.dataToUpload = UIImagePNGRepresentation(imageRotated); 但它返回给我空白图像......

标签： ios objective-c xcode ipad uiimage

【解决方案1】：

看看这个：http://www.catamount.com/blog/1015/uiimage-extensions-for-cutting-scaling-and-rotating-uiimages/

只要打电话

UIImage *rotatedImage = [originalImage imageRotatedByDegrees:180.0];

Source

【讨论】：

伙计，这简直太棒了，效果很好！感谢您的链接。

【解决方案2】：

UploadView.DataToUpload = [UIImage imageWithCGImage:[image CGImage] scale:1.0orientation : UIImageOrientationDown];

用于 180 度旋转。

【讨论】：