UIDocumentInteractionController and UIActivityViewController both present menus for sharing images out to other networks. After hitting Instagram, you are presented with a nice modal that allows you to post to Instgram without leaving the app. My question is, how do I automatically show that modal without showing the menu?UIDocumentInteractionController and UIActivityV
阅读背景：
在UIDocumentInteractionController或UIActivityViewController中自动选择Instagram
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