1

我UIImagePickerController用来从照片库中挑选图像。我使用横向和纵向来编辑图像。当我选择图像时，它会显示正确的纵向方向，但在横向模式下它会倒置显示。我参考了一些代码。但它仍然无法正常工作。我参考了这个链接iphone：从相机捕获的图像改变方向

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;

}
4

2 回答 2

1

经过一番研究，如果您将音量按钮朝上（自然方式，imo）拍照，则横向图像将显示为上下颠倒。这是因为相机的传感器不知道您的手机是横向还是横向。它建立在“垂直”方向是音量按钮向下的假设之上。

于 2015-09-18T16:12:39.157 回答
0

Try this.

In your class,

@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];
}

Hopefully, this will help you.

Thanks.

于 2013-07-29T09:20:17.880 回答