WTYFirstResponder is a convenient UIResponder category(objective-c)/extension(swift) with which you can get the current first responder with just one line of code.
For objective-c
#import "UIResponder+WTYFirstResponder.h"
id firstResponder = [UIResponder wty_firstResponder];
For swift
firstResponder = UIResponder.wty_firstResponder()Then you got the first responder.
Just copy the UIResponder+WTYFirstResponder.h/.m to your objective-c project or UIResponder+WTYFirstResponder.swift to your swift project, then you are good to go.
WTYFirstResponder is released under the MIT license. See LICENSE.