blocks|key|4803854|text|显然，您可以在拍摄后立即访问图像的元数据。选择镜像后系统调用的协议方法为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4803855|-+(void)imagePickerController:(UIImagePickerController+*)picker+didFinishPickingMediaWithInfo:(NSDictionary+*)info|code-block|syntax|javascript|4803856|info参数包含一个键：UIImagePickerControllerMediaMetadata|offset|length|style|CODE|4803857|现在，如果我能想出如何从中获得exif标记或任何曝光级别信息来推断有关光照级别的基本信息，我会很高兴。:)|4803858|entityMap^0|0|0|C|10|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Apparently, you can access the metadata of an image right after it has been taken. The protocol method that is called by the system after an image has been selected is:

<pre><code>- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
</code></pre>

The NSDictionary argument, info, contains a key: <code>UIImagePickerControllerMediaMetadata</code>

Now if I can figure out how to get the exif tags or any exposure-level information from this to infer basic information about light-level I will be happy. :)

blocks|key|1958174|text|更新到带有照片框架的iOS+11|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1958175|Objective+-+C:|offset|length|style|BOLD|1958176|#import+<Photos/Photos.h>

-+(void)imagePickerController:(UIImagePickerController+*)imagePicker+didFinishPickingMediaWithInfo:(NSDictionary<NSString+*,id>+*)info+{

++++PHAsset*+asset+=+info[UIImagePickerControllerPHAsset];

++++[asset+requestContentEditingInputWithOptions:nil+completionHandler:%5E(PHContentEditingInput+*contentEditingInput,+NSDictionary+*info)+{
++++++++CIImage+*fullImage+=+[CIImage+imageWithContentsOfURL:contentEditingInput.fullSizeImageURL];

++++++++NSLog(@"%25@",+fullImage.properties.description);
++++}];

++++[imagePicker+dismissViewControllerAnimated:YES+completion:nil];
}|code-block|syntax|javascript|1958177|您还需要使用图片库的权限(NSPhotoLibraryUsageDescription)，然后可以添加以下代码来查看did加载或查看did出现|1958178|[PHPhotoLibrary+requestAuthorization:%5E(PHAuthorizationStatus+status)+{
++++switch+(status)+{
++++++++case+PHAuthorizationStatusAuthorized:
++++++++++++NSLog(@"PHAuthorizationStatusAuthorized");
++++++++++++break;
++++++++case+PHAuthorizationStatusDenied:
++++++++++++NSLog(@"PHAuthorizationStatusDenied");
++++++++++++break;
++++++++case+PHAuthorizationStatusNotDetermined:
++++++++++++NSLog(@"PHAuthorizationStatusNotDetermined");
++++++++++++break;
++++++++case+PHAuthorizationStatusRestricted:
++++++++++++NSLog(@"PHAuthorizationStatusRestricted");
++++++++++++break;
++++}
}];|1958179|entityMap^0|0|0|E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

updated to iOS 11 with photos framework

Objective - C:

<pre><code>#import &lt;Photos/Photos.h&gt;

- (void)imagePickerController:(UIImagePickerController *)imagePicker didFinishPickingMediaWithInfo:(NSDictionary&lt;NSString *,id&gt; *)info {

 PHAsset* asset = info[UIImagePickerControllerPHAsset];

 [asset requestContentEditingInputWithOptions:nil completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
 CIImage *fullImage = [CIImage imageWithContentsOfURL:contentEditingInput.fullSizeImageURL];

 NSLog(@"%@", fullImage.properties.description);
 }];

 [imagePicker dismissViewControllerAnimated:YES completion:nil];
}
</code></pre>

You also need the permission of Photo library Usage (NSPhotoLibraryUsageDescription) and then can add the following code to view did load or view did appear

<pre><code>[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
 switch (status) {
 case PHAuthorizationStatusAuthorized:
 NSLog(@"PHAuthorizationStatusAuthorized");
 break;
 case PHAuthorizationStatusDenied:
 NSLog(@"PHAuthorizationStatusDenied");
 break;
 case PHAuthorizationStatusNotDetermined:
 NSLog(@"PHAuthorizationStatusNotDetermined");
 break;
 case PHAuthorizationStatusRestricted:
 NSLog(@"PHAuthorizationStatusRestricted");
 break;
 }
}];
</code></pre>

Is it possible to access the metadata of an image captured by UIImagePickerController in iOS? I understand this can be done with AssetLibrary framework for images captured by the camera application (or otherwise present in the iPhone photo library), but can a developer access any of the metadata/exif info from within an application right after a user has taken a picture? I'm looking for any type of camera exposure-level info from an image after it has been taken. Thanks!

Access metadata (exif tags) of image taken by UIImagePickerController - iOS/iPhone

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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是否可以在iOS中访问UIImagePickerController捕获的图像的元数据？我知道这可以通过相机应用程序(或iPhone照片库中的其他方式)捕获的图像的AssetLibrary框架来完成，但是开发人员可以在用户拍摄照片后立即从应用程序中访问任何元数据/exif信息吗？我正在寻找任何类型的相机曝光水平的信息，...

问访问UIImagePickerController - iOS/iPhone拍摄的图像的元数据(exif标签)
EN

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