Keyboard Return Key Handling:-

If you would like to implement keyboard Return Key as Next/Done button, then you can use IQKeyboardReturnKeyHandler.(#38, #63)

1. Create an instance variable of IQKeyboardReturnKeyHandler and instantiate it in viewDidLoad with ViewController object like this:-

@implementation ViewController
{
IQKeyboardReturnKeyHandler *returnKeyHandler;
}

• (void)viewDidLoad
  {
  [super viewDidLoad];

  returnKeyHandler = [[IQKeyboardReturnKeyHandler alloc] initWithViewController:self];
  }
  It assign all the responderView delegates to self, and change keybord Return Key to Next key.

2. set instance variable to nil in dealloc method.

-(void)dealloc
{
returnKeyHandler = nil;
}

If you just would like to get a callback when toolbar done button is pressed then you can check IQUIView+IQKeyboardToolbar.h, there is a method -(void)setCustomDoneTarget:(nullable id)target action:(nullable SEL)action;. This will not override default behaviour of done button and still dismiss keyboard, but you'll get a callback.

If you would like to get full control over done button then you can add your own UIToolbar to textField. In this case IQKeyboardManager will not override your toolbar and you'll take care of all the responsibility of your toolbar with your methods.

@Deepinder-Lakhi I used your code. it works in iOS 9 but not working in iOS 10.
"textFieldDidEndEditing" is not being invoked in IQKeyboardReturnKeyHandler.m in iOS 10.

Try to check text field when keyboard wants hide:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

@hackiftekhar
I need to get action of Done button.
There is no setCustomDoneTarget() in v5.0.8. Can you please specify which function is there to achieve action of Done button?
BTW, I am using Swift 4 and iOS 11

It's now moved to textField.keyboardToolbar.doneBarButton.setTarget(target:action:) please use this.

This is not working for me

textField.keyboardToolbar.doneBarButton.setTarget(self, action: #selector(action))

The action never gets called, and it I check po relationshipField.keyboardToolbar.doneBarButton.target after that line, I get a nil response

Interesting... if the textField has a delegate assigned, the target doesn't work If I removed the delegate, then it works fine. Is this expected? I still need the delegate for other functionality, so it sounds like a bug...

It is not expected. Please share demo project.