Ios 如何避免错误的方向显示图片，然后使用UIImagePickerController？

我正在使用UIImagePickerController在Objective C应用程序中拍照。然后用相机拍照或从gallery加载此图片，我在

UIImageView

中显示此图片。这是我的问题，图片显示旋转90º，如果这是在纵向定向设备

如果我获取了要在

UIImageView

中显示的

UIImage

的方向，则始终获取

UIImageOrientationUp

，因此我无法手动旋转该方向

 if (photo.imageOrientation == UIImageOrientationUp) {
    NSLog(@"UP"); //Always get this line. If Uiimage is portrait or landscape
}else if (photo.imageOrientation == UIImageOrientationRight) {
    NSLog(@"Right");
}

我正在尝试使用以下函数：

 - (UIImage *)fixrotation:(UIImage *)image{
...
}

但是图片没有旋转。因为我总是得到

UIImageOrientationUp

如何解决此问题并在my

UIImageView

中始终以纵向位置显示我的图片

我的didFinishPickingMediaWithInfo是：

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

image = [info valueForKey:UIImagePickerControllerOriginalImage];

 //I use this image to show in next View
SecondView * controller = [SecondView new];
controller.imageView.image = image;
[self performSegueWithIdentifier:@"segue2" sender:self];
[picker.self dismissModalViewControllerAnimated:YES];

    } 

然后在第三个视图中，在其他序列之间将其分配给UIImageView： //photo是从segue获取的变量 UIImage*imageToDisplay=photo.fixOrientation

self.imageV.image = imageToDisplay;
self.imageV.contentMode = UIViewContentModeScaleAspectFill;

谢谢。

为此使用类别

UIImage+fixOrientation.h

@interface UIImage (fixOrientation)

- (UIImage *)fixOrientation;

@end

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

---

我也面临着这个问题。 此代码必须解决以下问题：

UIImage *initialImage = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
NSData *data = UIImagePNGRepresentation(initialImage);

UIImage *tempImage = [UIImage imageWithData:data];
UIImage *fixedOrientationImage = [UIImage imageWithCGImage:tempImage.CGImage
                                       scale:initialImage.scale
                             orientation:initialImage.imageOrientation];

---

我使用了你的类，但这不适用于fixorientation。我导入：#导入“UIImage+fixOrientation.h”，然后调用函数到我的photo变量->UIImage*imageToDisplay=photo.fixOrientation；但这不起作用。。我是否做了一些不好的事情？？我正在使用NSLog进行调试，如果（self.imageOrientation==UIImageOrientationUp）{尽管图片是在纵向位置拍摄的：（尝试添加shouldAutoRotate（）方法（返回否）在您的ViewControlleri中，如果我在纵向中打开选取器，就像元数据一样，获取此信息，然后在拍摄时显示此获取位置。能否显示您的UIImagePickerDelegateMethod didFinishPickingMediaWithInfo以及您在UIImageView中设置图像的位置？谢谢，您的图像将显示在SecondV上的UIImageView上View viewController？在故事板上，您可以检查第二个视图的方向是否设置为横向（在该VC的属性面板内）。如果设置为横向，则这就是为什么它将显示在横向（从主VC旋转90*.不，是正确的，所有视图都是纵向的。但我看到了一些尝试，如果我在DIDFINish中使用fixOrientation，单击它会显示图片具有UIImageOrientationRight。但是如果我应用-（UIImage*）fixOrientation，它在下一个视图中保持不旋转。