Rubymotion vs Objective-C

register_user_screen.rb

class RegisterUserScreen < PM::Screen
  include ScreenElements

  title "Provide Your Info"

  def on_load
    register_keyboard_events

    tap = UITapGestureRecognizer.alloc.initWithTarget(self, action: :keyboard_did_hide)
    self.view.addGestureRecognizer(tap)

  end

  def on_disappear
    unregister_keyboard_events
  end

  def will_appear
    view.styleId = "mainWindow"
    add button class: 'next'
    add UILabel.new, {
      text:    "Register",
      resize:  [:left, :right, :top, :bottom, :width, :height],
      styleId: 'title'
    }

    add UILabel.new, {
      text:    "Enter your info",
      resize:  [:left, :right, :top, :bottom, :width, :height],
      styleId: 'sub-title'
    }

    @first_name = add UITextField.new,
                     placeholder: 'First Name',
                     styleId:     'first_name'

    @last_name = add UITextField.new,
                     placeholder: 'Last Name',
                     styleId:     'last_name'


    @phone_number = add UITextField.new,
                        placeholder:  '(555) 123-1234',
                        keyboardType: UIKeyboardTypeNumberPad,
                        styleId:      'phone_number'

  end

  def register_keyboard_events
    NSNotificationCenter.defaultCenter.addObserver(self,selector: :keyboard_did_show, name: :UIKeyboardDidShowNotification, object: nil)
    NSNotificationCenter.defaultCenter.addObserver(self,selector: :keyboard_did_hide, name: :UIKeyboardDidHideNotification, object: nil)
  end

  def unregister_keyboard_events
    NSNotificationCenter.defaultCenter.removeObserver(self)
  end


  def keyboard_did_show
    up_position = CGRectMake(0,-80,320,460)
    UIView.animateWithDuration(0.2,animations: lambda { self.view.setFrame(up_position) },completion: lambda {|finished| })
  end

  def keyboard_did_hide
    @first_name.resignFirstResponder
    @last_name.resignFirstResponder
    @phone_number.resignFirstResponder
    original_position = CGRectMake(0,0,320,460)
    UIView.animateWithDuration(0.2,animations: lambda { self.view.setFrame(original_position) },completion: lambda {|finished| })

  end

end

TSFPersonalInfoViewController.m

//
//  TSFPersonalInfoViewController.m
//  Trail Safe
//
//  Created by Franklin Webber on 6/1/13.
//  Copyright (c) 2013 Trail Safe. All rights reserved.
//

#import "TSFPersonalInfoViewController.h"
#import "TSFUser.h"
#import "TSFServiceProvider.h"

@interface TSFPersonalInfoViewController ()

@end

@implementation TSFPersonalInfoViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                   initWithTarget:self
                                   action:@selector(dismissKeyboardAnimated)];
    
    [self.view addGestureRecognizer:tap];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self registerKeyboardEvents];
}

- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    [self unregisterKeyboardEvents];
}

#pragma mark - Keyboard Events

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    return NO;
}

- (void)keyboardDidShow:(NSNotification *)notification {
    __block UIView *mainView = self.view;
    
    [UIView animateWithDuration:0.2 animations:^{
        [mainView setFrame:CGRectMake(0,-130,320,460)];
    }];
    
}

-(void)keyboardDidHide:(NSNotification *)notification {
    [self dismissKeyboardAnimated];
}

- (void)dismissKeyboardAnimated {
    [[self phoneField] resignFirstResponder];
    [[self nameField] resignFirstResponder];
    
    __block UIView *mainView = self.view;
    
    [UIView animateWithDuration:0.2 animations:^{
        [mainView setFrame:CGRectMake(0,0,320,460)];
    }];
}

- (void)registerKeyboardEvents {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
}

- (void)unregisterKeyboardEvents {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

@end