Enabling Xcode like Auto-Complete in Eclipse…

1. Open Preferences in Eclipse. ( Command Key + , ) 

2. Type “Content Assist” into search box.

3. For each Editor that you wish to have code completion:

• Ensure “Enable auto activation” is checked.
• Put all characters into “Auto activation triggers for *” e.g.  .abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_0123456789
• Set “Auto activation delay” to 500 (or whatever works for you).

Thanks to Matt