1.WARNING ITMS-90737: "Missing Document Configuration. By declaring the CFBundleDocumentTypes key in your app, you've indicated that your app is able to open documents. Please set the UISupportsDocumentBrowser key to "YES" if your app uses a UIDocumentBrowserViewController. Otherwise, set the LSSupportsOpeningDocumentsInPlace key in the Info.plist to "YES" (recommended) or "NO" to specify whether the app can open files in place. All document-based apps must include one of these configurations. For more information, visit https://developer.apple.com/document-based-apps/."

这个警告是你使用了iOS系统自带的预览功能，这个需要你在项目的plist中添加Supports Document Browser为YES。