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在 ios 应用程序上工作，我试图弄清楚即使应用程序固定在纵向模式下如何获得实际的设备方向。目前所有的方向检查都给了我肖像。这是我检查过的。

CGRect frame = [[UIScreen mainScreen] applicationFrame];
UIInterfaceOrientation orientation2 = [[UIApplication sharedApplication] statusBarOrientation];
UIInterfaceOrientation orientation = [[UIDevice currentDevice] orientation];

基本上我想知道照片的拍摄方向，但是如果相机选择器以纵向加载并且手机在此之后变成横向，则照片的结果方向是纵向。我希望能够在拍摄照片的那一刻检查实际的设备方向并进行相应的转换。关于如何解决这个问题的任何想法？

编辑：我将研究使用陀螺仪，因为这将报告情况如何。

编辑：对不起，我应该提到手机本身是固定的纵向。但是有没有办法绕过它来看看它实际上是什么

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2 回答 2

0

使用UIDevice的orientation属性

[[UIDevice currentDevice] orientation];

它返回您设备的物理方向。

参考

于 2012-12-18T12:25:04.173 回答
0

将您捕获的图像传递给此函数，它会以您捕获的方向返回图像。

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

    // No-op if the orientation is already correct
    if (myImage.imageOrientation == UIImageOrientationUp) return myImage;

    // 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 (myImage.imageOrientation) {
        case UIImageOrientationDown:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, myImage.size.width, myImage.size.height);
            transform = CGAffineTransformRotate(transform, M_PI);
            break;

        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
            transform = CGAffineTransformTranslate(transform, myImage.size.width, 0);
            transform = CGAffineTransformRotate(transform, M_PI_2);
            break;

        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, 0, myImage.size.height);
            transform = CGAffineTransformRotate(transform, -M_PI_2);
            break;
        case UIImageOrientationUp:
        case UIImageOrientationUpMirrored:
            break;
    }

    switch (myImage.imageOrientation) {
        case UIImageOrientationUpMirrored:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, myImage.size.width, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;

        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, myImage.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, myImage.size.width, myImage.size.height,
                                             CGImageGetBitsPerComponent(myImage.CGImage), 0,
                                             CGImageGetColorSpace(myImage.CGImage),
                                             CGImageGetBitmapInfo(myImage.CGImage));
    CGContextConcatCTM(ctx, transform);
    switch (myImage.imageOrientation) {
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            // Grr...
            CGContextDrawImage(ctx, CGRectMake(0,0,myImage.size.height,myImage.size.width), myImage.CGImage);
            break;

        default:
            CGContextDrawImage(ctx, CGRectMake(0,0,myImage.size.width,myImage.size.height), myImage.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;
}
于 2012-12-18T12:14:03.377 回答