blocks|key|43696|text|我要自己回答最后一个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|43697|您需要同时声明NSPhotoLibraryUsageDescription和NSPhotoLibraryAddUsageDescription，以便使其在iOS+9、10.3和11上都能工作。|offset|length|style|CODE|43698|技术上来说是不同的。我以前不声明NSPhotoLibraryUsageDescription，它在iOS+9和11上运行良好，但在iOS+10.3上失败并崩溃。|43699|这是一个非常糟糕的版本控制从苹果，而更高的版本不符合和支持旧版本的许可。|43700|entityMap^0|0|7|U|12|X|0|G|U|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|W|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|M|$]]

To answer the last question on my own:

You need to declare both <code>NSPhotoLibraryUsageDescription</code> and <code>NSPhotoLibraryAddUsageDescription</code> to get it WORKS on both iOS 9, 10.3 and 11.

Technically it's different.
I used to not declare <code>NSPhotoLibraryUsageDescription</code>, it works fine on iOS 9 and 11 but failed and crashed on iOS 10.3.

This is a really bad version controlling from Apple while higher version doesn't comply and support older version permission.

blocks|key|74623|text|从苹果官方文件中获得的简单信息|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|74624|📷|atomic|74625|​|74626|只需点击上面的图像进行缩放和读取。|74627|欲了解更多关于以下方面的信息：|74628|NSPhotoLibraryAddUsageDescription：如果您想要将照片/图像保存到您的照片库中。对于iOS11+and+%2B|unordered-list-item|style|BOLD|CODE|74629|NSPhotoLibraryUsageDescription：如果你想访问，你的照片库。对于iOS10+and+%2B|74630|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html|1|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/9731872f500c5049459b13d0849a94f4.png|imageAlt|2|https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW73|3|https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW17^0|0|F|0|0|0|1|1|0|0|0|0|13|T|1L|B|0|X|2|0|0|1L|1A|B|0|U|3|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@$A|1D|B|1E|1|1F]]|C|$]]|$1|D|3|E|5|F|7|1G|8|@]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|G|3|H|5|6|7|1K|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|1L|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1M|8|@]|9|@]|C|$]]|$1|M|3|N|5|O|7|1N|8|@$A|1O|B|1P|P|Q]|$A|1Q|B|1R|P|R]]|9|@$A|1S|B|1T|1|1U]]|C|$]]|$1|S|3|T|5|O|7|1V|8|@$A|1W|B|1X|P|Q]|$A|1Y|B|1Z|P|R]]|9|@$A|20|B|21|1|22]]|C|$]]|$1|U|3|-4|5|6|7|23|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|13|Y|14|C|$15|16|17|-4]]|18|$5|X|Y|Z|C|$10|19]]|1A|$5|X|Y|Z|C|$10|1B]]]]

<a href="https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html" rel="noreferrer">Simple get from Apple Official Document</a><a href="https://i.stack.imgur.com/1xNXi.png" rel="noreferrer"><img src="https://i.stack.imgur.com/1xNXi.png" alt=""></a>

Just click on above image for ZOOM and read it.

For more information on: 

<ul>
<li><a href="https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW73" rel="noreferrer">NSPhotoLibraryAddUsageDescription</a>: If you want to save a photo/image to your Photo Library. For <code>iOS11 and +</code></li>
<li><a href="https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW17" rel="noreferrer">NSPhotoLibraryUsageDescription</a>: If you want to access your Photo Library. For <code>iOS10 and +</code></li>
</ul>

blocks|key|1709288|text|正如我在文件中所看到的，两者之间的区别是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1709289|NSPhotoLibraryAddUsageDescription:你有权只写，不读。|unordered-list-item|1709290|NSPhotoLibraryUsageDescription:你既可以读也可以写照片。|1709291|来自苹果的NSPhotoLibraryUsageDescription文档：|1709292|“虽然这个键控制对用户照片库的读写访问，但如果应用程序只需要向库添加资产，而不需要读取任何资产，则最好使用。”|offset|length|style|BOLD|1709293|entityMap^0|0|0|0|0|1H|2|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|S|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|T|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|U|8|@$K|V|L|W|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|P|$]]

As I can see in the document, the difference between two is:

<ul>
<li>NSPhotoLibraryAddUsageDescription: You have permission to write only, no read. </li>
<li>NSPhotoLibraryUsageDescription: You can both read and write to Photos.</li>
</ul>

From Apple documentations for NSPhotoLibraryUsageDescription:

"Although this keys governs read and write access to the user’s photo library, it’s best to use NSPhotoLibraryAddUsageDescription if your app needs only to add assets to the library and does not need to read any assets."

blocks|key|1709303|text|两者都需要。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1709304|因为一旦我尝试使用UIActivityViewController将图像保存到库中，我的iphone版本是11.3，我只使用NSPhotoLibraryUsageDescription，因为我需要NSPhotoLibraryAddUsageDescription，所以它崩溃了。|offset|length|style|CODE|1709305|但ios+9.3没有崩溃。|1709306|entityMap^0|0|9|O|1Q|U|2Q|X|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|K|$]]

You gonna need both.
 Because once I tried use <code>UIActivityViewController</code> to save image to library, my iphone version is 11.3, I only use <code>NSPhotoLibraryUsageDescription</code> and it's crash because i need <code>NSPhotoLibraryAddUsageDescription</code>.
 But ios 9.3 not crash.

blocks|key|1709379|text|基于请求权限的API和iOS版本，写访问有区别，所以您需要两者。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1709380|我的应用程序已经有了NSPhotoLibraryUsageDescription，以便使用PHPhotoLibrary保存图像。|1709381|在iOS+11上，这仍然有效，但如果我的应用程序还没有获得许可，那么通过UIDocumentInteractionController中的“保存图像”共享图像会导致崩溃，并发出关于NSPhotoLibraryAddUsageDescription的警告。如果已经通过PHPhotoLibrary授予了许可，我似乎不需要NSPhotoLibraryAddUsageDescription来保存图像。|1709382|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

There is a difference for write access based on the API asking for permission as well as the iOS version, so you need both.

My app already had NSPhotoLibraryUsageDescription in order to use PHPhotoLibrary to save images. 

On iOS 11, that still works but if my app hasn't yet got permission then sharing an image via "Save Image" in a UIDocumentInteractionController causes a crash with a warning about NSPhotoLibraryAddUsageDescription. If permission has already been granted via PHPhotoLibrary I don't seem to need NSPhotoLibraryAddUsageDescription for "Save Image".

My app get crashed today while updating on Xcode9, testing on iOS11.
After adding <code>NSPhotoLibraryAddUsageDescription</code> then it works, even i already had <code>NSPhotoLibraryUsageDescription</code>.

Ive read about them, one supported since iOS6, one iOS11 but Apple didn't mention what's difference between them.
<a href="https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW73" rel="noreferrer">https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW73</a>

If i keep the new one (<code>NSPhotoLibraryAddUsageDescription</code>), will it work for iOS 8 also or i have to keep both of them?

What's difference between NSPhotoLibraryAddUsageDescription and NSPhotoLibraryUsageDescription?

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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我的应用程序今天在Xcode9上更新时崩溃，在iOS11上进行测试。在添加了NSPhotoLibraryAddUsageDescription之后，它就可以工作了，甚至我已经有了NSPhotoLibraryUsageDescription。我读过关于它们的文章，其中一篇是iOS6支持的，一部是iOS11，但苹果并没有提到它们之间的区别。如果我保留了新的(NSPhotoLibraryAddUsage

问NSPhotoLibraryAddUsageDescription和NSPhotoLibraryUsageDescription有什么区别？
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