如何将方向数据写入UIImage iOS SDK [英] How to write orientation data to the UIImage iOS SDK

问题描述

我有一个问题，我有一个UIImage从imagePicker（相机不是库），但当我写它到文件与[UIImageJPEGRepresentation writeToFile：atomically：]我丢失方向数据（所有图像都是横向），我使用一些代码与图像变换，但它需要太长的大约1,5 - 2秒每个图像，我的问题是如何不松散方向？也许我可以写它到EXIF数据？
Thx的帮助。

I have a problem i got a UIImage from imagePicker (camera not library) but when i write it to file with [UIImageJPEGRepresentation writeToFile: atomically:] i'm loosing orientation data(all images are in landscape), i used some code with image transformation, but it take too long about 1,5 - 2 sec per image, my question is how to not loose orientation ? Maybe i can write it to EXIF data ? Thx for help.

编辑：
Thx到Jonathan Cichon，现在我得到了一个图像方向与UIImagePickerControllerMediaMetadata i got（Orientation = 6），但是如何存储到jpg文件？ （再次用[UIImageJPEGRepresentation writeToFile：atomically：] proc保存文件）

Thx to Jonathan Cichon, now i got a image orientation with UIImagePickerControllerMediaMetadata i got (Orientation = 6), but how to store it to jpg file ? (again i saved file with [UIImageJPEGRepresentation writeToFile: atomically:] proc)

推荐答案

查看这篇文章了解如何存储EXIF数据的信息。如果我记得正确，你可以使用UIImagePickerControllerMediaMetadata，因为它是。至少你应该在这个字典中找到所有的necassary取向信息来创建你的EXIF数据。

Look at this post for information on how to store EXIF data. If i remember correctly you can use the UIImagePickerControllerMediaMetadata as it is. At least you should find all necassary orientation information in this dictionary to create your EXIF data.

查看关联的帖子，并替换第一行

NSData * jpeg = UIImageJPEGRepresentation(yourImage, 1);

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