iOS11备注

昨天刚升级iOS11 ，Xcode9，使用相机拍照时发现会崩溃

This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSPhotoLibraryAddUsageDescription key with a string value explaining to the user how the app uses this data.

后来发现iOS11下，苹果对相册的权限key做了调整，原来的 NSPhotoLibraryUsageDescription ，在iOS11之后，改成了NSPhotoLibraryAddUsageDescription。