How to add Done button to the keyboard

well keyboard appears when u will enter text in app.
in iOS we can enter input text using UITextField or by using UITextView.

.h File

#import 

@interface ViewController : UIViewController <uitextfielddelegate,uitextviewdelegate>

@property (strong, nonatomic) IBOutlet UITextField *textField;

@property (strong, nonatomic) IBOutlet UITextView *textView;
@end

.m File

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self.textField setReturnKeyType:UIReturnKeyDone];
    [self.textView setReturnKeyType:UIReturnKeyDone];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

** Dont forgot to add delegate of text field and text view

[self.textField setReturnKeyType:UIReturnKeyDone];
   [self.textView setReturnKeyType:UIReturnKeyDone];