FirstTabKBViewController.m

//
//  FirstTabKBViewController.m
//  OCVeryTemp
//
//  Created by Don Mag on 2/19/18.
//

#import "FirstTabKBViewController.h"

@interface FirstTabKBViewController ()

@end

@implementation FirstTabKBViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
	
}

- (void)viewWillAppear:(BOOL)animated {
	[super viewWillAppear:animated];
	
	// Listen for keyboard appearances and disappearances
	[[NSNotificationCenter defaultCenter] addObserver:self
		selector:@selector(keyboardDidShow:)
		name:UIKeyboardDidShowNotification
		object:nil];
	
	[[NSNotificationCenter defaultCenter] addObserver:self
		selector:@selector(keyboardDidHide:)
		name:UIKeyboardDidHideNotification
		object:nil];

}

- (void)viewWillDisappear:(BOOL)animated {
	NSLog(@"FIRST view will dis");
	[super viewWillDisappear:animated];

	[[NSNotificationCenter defaultCenter] removeObserver:self
		name:UIKeyboardDidHideNotification
		object:nil];
	
	[[NSNotificationCenter defaultCenter] removeObserver:self
		name:UIKeyboardDidShowNotification
		object:nil];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	[[self view] endEditing:TRUE];
}

- (void)keyboardDidShow: (NSNotification *) notif{
	// Do something here
	NSLog(@"FIRST kb did show");
}

- (void)keyboardDidHide: (NSNotification *) notif{
	// Do something here
	NSLog(@"FIRST kb did hide");
}

@end

SecondTabKBViewController.m

//
//  SecondTabKBViewController.m
//  OCVeryTemp
//
//  Created by Don Mag on 2/19/18.
//

#import "SecondTabKBViewController.h"

@interface SecondTabKBViewController ()

@end

@implementation SecondTabKBViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)viewWillAppear:(BOOL)animated {
	[super viewWillAppear:animated];
	
	// Listen for keyboard appearances and disappearances
	[[NSNotificationCenter defaultCenter] addObserver:self
		selector:@selector(keyboardDidShow:)
		name:UIKeyboardDidShowNotification
		object:nil];
	
	[[NSNotificationCenter defaultCenter] addObserver:self
		selector:@selector(keyboardDidHide:)
		name:UIKeyboardDidHideNotification
		object:nil];
	
}

- (void)viewWillDisappear:(BOOL)animated {
	NSLog(@"SECOND view will dis");
	[super viewWillDisappear:animated];
	
	[[NSNotificationCenter defaultCenter] removeObserver:self
		name:UIKeyboardDidHideNotification
		object:nil];
	
	[[NSNotificationCenter defaultCenter] removeObserver:self
		name:UIKeyboardDidShowNotification
		object:nil];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	[[self view] endEditing:TRUE];
}

- (void)keyboardDidShow: (NSNotification *) notif{
	// Do something here
	NSLog(@"SECOND kb did show");
}

- (void)keyboardDidHide: (NSNotification *) notif{
	// Do something here
	NSLog(@"SECOND kb did hide");
}

@end