In iOS8, I used this and it worked:
NSFileManager.DefaultManager.GetUrls (NSSearchPathDirectory.LibraryDirectory, NSSearchPathDomain.User) [0].Path
I got this on the Xamarin iOS file system page. It says: "iOS 8 NOTE: portions of this document are affected by changes in iOS 8. If your application uses Environment.SpecialFolder or calculates relative paths such as" .. / Documents ", you should read this technical note from Apple. Available at the Basics of the iOS File System. "
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