Question

I current have an app that uses ALAsssetsLibrary to fetch the photos. I have placed the photo to an image view and I am able to upload to the server. When I tested on the real device after taking some photos, I found out the photos that supposed to be taken in Portrait become a landscape.

因此,我呼吁发挥不同的作用,使农业研究小组能够这样做:

UIImage *image = [UIImage imageWithCGImage:[representation fullResolutionImage] scale:1.0 orientation:(UIImageOrientation)[representation orientation]];

我第一次尝试了:

UIImage *image = [UIImage imageWithCGImage:[representation fullResolutionImage]]

我认为,光照照照照照照照照照照照照照照照照照照照照照照照照照照照照照照,可以给我正确方向。但是,这并没有给我正确的解决办法。

我是否误解了产生正确照片取向所必需的任何东西?

Answer 1

The correct orientation handling depends on the iOS version you are using. On iOS4 and iOS 5 the thumbnail is already correctly rotated, so you can initialize your UIImage without specifying any rotation parameters. However for the fullScreenImage, the behavior is different for each iOS version. On iOS 5 the image is already rotated on iOS 4 not.

因此,在座各位应当使用:

ALAssetRepresentation *defaultRep = [asset defaultRepresentation];
UIImage *_image = [UIImage imageWithCGImage:[defaultRep fullScreenImage] 
                                                     scale:[defaultRep scale] orientation:(UIImageOrientation)[defaultRep orientation]];

关于OS5,以下法典应当正确操作:

ALAssetRepresentation *defaultRep = [asset defaultRepresentation];
UIImage *_image = [UIImage imageWithCGImage:[defaultRep fullScreenImage] scale:[defaultRep scale] orientation:0];

Cheers,

Hendrik

Answer 2

引言:

 UIImage* img = [UIImage imageWithCGImage:asset.thumbnail];
 img = [UIImage imageWithCGImage:img.CGImage scale:1.0 orientation:UIImageOrientationUp];

这可能有助于你。

Answer 3

我的经验限于5.x,但我可以告诉你,th子和全屏幕图像是正确的。它在垂直射出时, horizontal平分。我的解决办法是利用我从这里获得的一类ui:

它提供了一种像以下那样的冰轮旋转法:

        UIImage *tmp = [UIImage imageWithCGImage:startingFullResolutionImage];
        startingFullResolutionImage = [[tmp imageRotatedByDegrees:-90.0f] CGImage];

Answer 4

full Resolution 图像,我谨提出如下解决办法:

ALAssetRepresentation *rep = [asset defaultRepresentation];

// First, write orientation to UIImage, i.e., EXIF message.
UIImage *image = [UIImage imageWithCGImage:[rep fullResolutionImage] scale:rep.scale orientation:(UIImageOrientation)rep.orientation];
// Second, fix orientation, and drop out EXIF
if (image.imageOrientation != UIImageOrientationUp) {
   UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
   [image drawInRect:(CGRect){0, 0, image.size}];
   UIImage *normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();
   image = normalizedImage;
}
// Third, compression
NSData *imageData = UIImageJPEGRepresentation(image, 1.0);

<代码>imageData是你想要的,只是将其上载到你的照片服务器。

这样,如果你认为EXIF是有用的,你可以按照你的愿望,将其补充到<>代谢/代码>。

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