UITextFieldKeyboardIssues.h

#import <UIKit/UIKit.h>

@interface UITextFieldKeyboardIssues : UIViewController <UITextFieldDelegate>
{
    CGRect screenRect;
    
    CGFloat X;
    CGFloat Y;
    CGFloat WIDTH;
    CGFloat HEIGHT;
}

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


@end

UITextFieldKeyboardIssues.m

#import "UITextFieldKeyboardIssues.h"

@interface UITextFieldKeyboardIssues ()

@end

@implementation UITextFieldKeyboardIssues

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.textField.delegate = self;
    
    screenRect = [[UIScreen mainScreen] bounds];
    WIDTH = screenRect.size.width;
    HEIGHT = screenRect.size.height;
    X = 0;
    if(HEIGHT == 460)
        Y = -180;
    else
        Y = -210;
}

- (void) textFieldDidBeginEditing:(UITextField *)textField {
    
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDuration:0.5];
    [UIView setAnimationBeginsFromCurrentState:YES];
    
    self.view.frame = CGRectMake(X, Y, WIDTH, HEIGHT);
    [UIView commitAnimations];
    
}

- (void) textFieldDidEndEditing:(UITextField *)textField {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDuration:0.5];
    [UIView setAnimationBeginsFromCurrentState:YES];
    self.view.frame = CGRectMake(X, 0, WIDTH, HEIGHT);
    [UIView commitAnimations];
}


@end