Adjust view to show fields when keyboard appears

ShowTextFieldViewController.m

#pragma mark - UITextField Delegates

-(void)textFieldDidBeginEditing:(UITextField *)textField
{
    self.activeTextField = textField;
}


#pragma mark - Keyboard Notification Methods

-(void)keyboardWillShow:(NSNotification*) notification
{
    
    /*
     This will check if the currently active field will be hidden 
     by the keyboard when it appears. If it will be, view's frame
     will be adjusted upwards so that the active field will be visible.
    */
    
    NSDictionary *info = [notification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    
    CGFloat keyboardHeight = kbSize.height;
    
    NSLog(@"%f", kbSize.height);
    
    CGRect selfViewFrame = self.view.frame;
    selfViewFrame.size.height -= keyboardHeight;
    
    CGPoint activeFieldOrigin = self.activeTextField.frame.origin;
    activeFieldOrigin.y += self.activeTextField.frame.size.height + 10;
    
    if(!CGRectContainsPoint(selfViewFrame, activeFieldOrigin)){
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
        
        CGRect selfViewRect = self.view.frame;
        selfViewRect.origin.y -= keyboardHeight - (selfViewRect.size.height - activeFieldOrigin.y);
        
        self.view.frame = selfViewRect;
        
        [UIView commitAnimations];
    }
    
}

-(void)keyboardWillHide:(NSNotification*)notification
{
    
    //Returns the main view's frame back into it's original position.
    
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];
    
    CGRect selfViewRect = self.view.frame;
    selfViewRect.origin.x = 0;
    selfViewRect.origin.y = 0;
    
    self.view.frame = selfViewRect;
    
    [UIView commitAnimations];
}