APP提交审核被拒之后，给出的反馈如下：
Guideline 2.5.1 - Performance - Software Requirements
Your app uses the “prefs:root=” non-public URL scheme, which is a private entity. The use of non-public APIs is not permitted on the App Store because it can lead to a poor user experience should these APIs change.
Continuing to use or conceal non-public APIs in future submissions of this app may result in the termination of your Apple Developer account, as well as removal of all associated apps from the App Store.
Next Steps
To resolve this issue, please revise your app to provide the associated functionality using public APIs or remove the functionality using the “prefs:root” or “App-Prefs:root” URL scheme.
If there are no alternatives for providing the functionality your app requires, you can file an enhancement request.
大致的意思是说我使用了非公开的api, 这些api现在已经不允许使用，原因是这些api若发生变化，会给用户很不好的体验。
我查了一下，iOS10之后，这些代码就不允许使用了。给出了新的方法：
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString]；
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
if ([[UIApplication sharedApplication] canOpenURL:url]) {
[[UIApplication sharedApplication] openURL:url];
}
旧的方法”prefs:root=“在iOS8系统上使用，现在基本上不使用iOS8了，所以可以直接删除掉就OK了。
在工程中搜索“prefs:root=”代码行。
发现是在使用相册的时候进行了判断：
修改如下：
