AutoNullable

Auto add nullable for objective-c header file.

Embed Xcode source editor extension.

If your project is mixing Swift and Objective-C, this tool will be very useful.
It can auto add nullable for Objective-C header file, it supports:
- the properties of class
- the return value of method 
- the block parameters

# How to enable the extension
1. Enable the extension:
- Choose Apple menu > System Preferences, then click Extensions
- Select the checkbox in the Extensions > Xcode Source Editor > AutoNullable
2. Restart Xcode if opened.
＃ How to use the extension
In the Xcode Menu Bar, select "Editor > AutoNullable"