Create Custom UIPickerView Controller

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This Custom Picker can easily integrated with your current project.Here,I just use a UITable View and some custom delegates method  for this.
Here, I give some limited design of each cell and some custom animation.It can be modified so easily.
here i just give some picture of this and Link for the

Delegate & Protocols: Creating Custom Delegate Methods in Objective C

What is Delegate :

A Delegate is an object that usually reacts to some event in another object and can affect how another object behaves.Delegates are used to delegate tasks of objects to their owner.A good reason for this is it makes it easier to use composition instead of inheritance.Delegates are a reference to an object that confirm to a specified protocol.So,you can guarantee it will implement the required methods.

One of the best examples (if we're talking iPhone) is theUITableViewDelegate, which is called to do certain things when certain table-related events occur.