Undefined symbols for architecture i386: "_OBJC_CLASS_$_MFMailComposeViewController"

Question

I train in the creation of programs for the iPhone using MFMailComposeViewController. However, an error occurs when compiling:

Undefined symbols for architecture i386:
   "_OBJC_CLASS_ $ _MFMailComposeViewController", Referenced from:
       objc-class-ref in ViewController.o
ld: symbol (s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use-v to see invocation)

Please help, what is it? And how to fix it?

Thanks in advance!

Answer 1

You must add the MessageUI.framework framework to you project.

Here's how you do it:

• Select the project in the project navigator sidebar.
• Click on the "Build Phases" tab.
• Expand the "Link Binary With Libraries" section.
• Click the '+' button.
• Choose 'MessageUI.framework' from the list. (You can use the search box to find it).

Answer 2

You likely do not have the necessary imports:

MessageUI.framework

How you add them can be found here importing framework