I've got an NSData object, that I am placing inside a dictionary. I am then writing the dictionary to the documents directory. Then I'm immediately making the URL to the file available to the uiactivityviewcontroller so that it is included for attachment in the Mail app.I've got an NSData object, that I am placing in
阅读背景：
无法在NSDictionary中检索已写入文件的NSData。
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