I'm really not sure what you're looking for, since your question isn't very clear, but I'm taking a shot in the dark.

I think you're looking for a way to output your custom field type as EE template tags, as you say:

{playlist}
    {videos}
    {titles}
{/playlist}


To do something like this, you probably need to parse those variables using the template class. Use these references to refresh your knowledge of EE custom add-ons:

https://ellislab.com/expressionengine/user-guide/development/fieldtypes.html#development-reference

https://ellislab.com/expressionengine/user-guide/development/usage/template.html#parsing-variables

Pair variables on Custom Field Type
Not long ago I started learning Objective-C with an interest of developing apps. I have just started my first app and I have no clue how to make my app retina. I made the design in photoshop and exported it as a png @ 2,048 x 1,536 but however the size of my storyboard is only 1,024 x 768. I have read somewhere on the internet that you need two story boards but I am not sure how to link everything together. I would really appreciate it if someone could help me.
