Question

我正在使用UIImagePickerController从照片库中挑选图片。我使用风景和肖像来编辑图像。当我选择图像时，它将显示正确的纵向方向，但在横向模式下，它会颠倒显示。我提到了一些代码。但它还没有奏效。我引用了这个链接iphone : image captured from camera changes orientation

代码：

-(void)pick:(id)sender{


            imagePicker=[[UIImagePickerController alloc]init];

            imagePicker.delegate = self;

            imagePicker.allowsEditing =NO;

            imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

            // imagePicker.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum;


            //  [self presentModalViewController:imagePicker animated:YES];

            [self presentViewController:imagePicker animated:YES completion:nil];

}

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


 newImage = [[UIImageView alloc] initWithImage:[info objectForKey:UIImagePickerControllerOriginalImage]];




     [newImage setFrame:CGRectMake(0, 0, 320, 568)];

    [newImage setUserInteractionEnabled:YES];

[self.view addSubview:newImage];

    [picker dismissViewControllerAnimated:YES completion:nil];

UIDeviceOrientation curDeviceOrientation = [[UIDevice currentDevice] orientation];

    switch (curDeviceOrientation) {
        case UIDeviceOrientationPortrait:

            NSLog(@"port");
             newImage.image = [ newImage.image imageRotatedByDegrees:0];
            break;
        case UIDeviceOrientationPortraitUpsideDown:
             newImage.image = [ newImage.image imageRotatedByDegrees:180];
            break;
        case UIDeviceOrientationLandscapeLeft:

             NSLog(@"Left");
             newImage.image = [ newImage.image imageRotatedByDegrees:0];
            break;
        case UIDeviceOrientationLandscapeRight:
             newImage.image = [ newImage.image imageRotatedByDegrees:90];
            break;
        case UIDeviceOrientationFaceUp:
        case UIDeviceOrientationFaceDown:
        default:
            break; // leave the layer in its last known orientation
    }

}

- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees
{
    // calculate the size of the rotated view's containing box for our drawing space
    UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.size.width, self.size.height)];

    CGAffineTransform t = CGAffineTransformMakeRotation(DegreesToRadians(degrees));
    rotatedViewBox.transform = t;
    CGSize rotatedSize = rotatedViewBox.frame.size;

    // Create the bitmap context
    UIGraphicsBeginImageContext(rotatedSize);
    CGContextRef bitmap = UIGraphicsGetCurrentContext();

    // Move the origin to the middle of the image so we will rotate and scale around the center.
    CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);

    //   // Rotate the image context
    CGContextRotateCTM(bitmap, DegreesToRadians(degrees));

    // Now, draw the rotated/scaled image into the context
    CGContextScaleCTM(bitmap, 1.0, -1.0);
    CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2, self.size.width, self.size.height), [self CGImage]);

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;

}

Answer 1

在做了一些研究之后，如果您拍摄的音量按钮指向上方（自然方式，imo），风景图像将显示为颠倒。这是因为相机的传感器不知道您是将手机放在横向左侧还是横向右侧。它建立在假设“直立”方向是指体积按钮指向下方的方向上。

Answer 2

试试这个。

在你的班上，

@interface NonRotatingUIImagePickerController : UIImagePickerController

@end

@implementation NonRotatingUIImagePickerController

-(BOOL)shouldAutorotate
{
    return NO;
}

@implementation YOUR_CLASS

UIImagePickerController *imgPicker;

- (void)viewDidLoad
{
    imgPicker = [[NonRotatingUIImagePickerController alloc] init];
}

-(IBAction)clickForPhoto:(id)sender
{
    imgPicker.delegate = self;

    imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:imgPicker animated:YES completion:nil];
}

希望这对你有帮助。

感谢。

拍摄图像后图像颠倒

2 个答案: