Visual nested tree-like control for iOS [closed]

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I am designing an iPad App that needs a control that allows the user to create a tree-like nested structure visually similar to a class diagram designer or a ERD diagram designer.

Before I re-invent the wheel, has anyone come across any paid or open source controls that enable this type of functionality?

This is the basic use case: The user taps and creates an entity. The user taps the entity and selects an entity type and a sub entity is created with a link line between the sub entity and the super entity.

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The following is what I found:

https://github.com/LaTtEX/MyTreeViewPrototype

https://github.com/epreston/PSTreeGraph

https://github.com/adamhoracek/KOTree

https://github.com/seletz/CocoaTreeViewExample

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https://github.com/epreston/PSTreeGraph/