Obj-C Example

//
//  JbD_Opus001_MainViewController.m
//  Pixel Coder
//
//  Created by John E Russo on 1/9/13.
//  Copyright (c) 2013-2014 John E Russo. All rights reserved.
//

#import "JbD_Opus001_MainViewController.h"
#import "JbD_Opus001_Converter.h"
#import "Constants.h"

@implementation JbD_Opus001_MainViewController
{
    JbD_Opus001_Converter *myConverter;
}

@synthesize noBaseValueAlert, noConversionValueAlert, displayString, mainTextField, insetLabel, baseValueLabel, baseButton, firstConversionView, secondConversionView, thirdConversionView, pxUOMLabel, ptUOMLabel, percentUOMLabel, emsUOMLabel, pxValueLabel, ptValueLabel, percentValueLabel, emsValueLabel;

- (void)viewDidLoad
{

    [super viewDidLoad];

    //init alert views
    noBaseValueAlert = [[UIAlertView alloc] initWithTitle:@"No Base Value" message:@"Enter a non-zero value and tap the Set Base button" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
    noConversionValueAlert = [[UIAlertView alloc] initWithTitle:@"No Conversion Value" message:@"Enter a value and tap a conversion button" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];

    //init displayString
    displayString = [NSMutableString stringWithCapacity:4];

    //init Converter
    myConverter = [[JbD_Opus001_Converter alloc] init];

    //set nav controller's view b/g color
    self.view.backgroundColor = kMyGray;

    //grab nav bar from nav controller
    UINavigationBar *mainNavBar = [self.navigationController navigationBar];

    //change nav bar b/g to black
    mainNavBar.barStyle = UIBarStyleBlack;

    //customize title text
    NSDictionary *titleTextProperties = [[NSDictionary alloc] initWithObjectsAndKeys:[UIFont fontWithName:@"Helvetica" size:18.0f], NSFontAttributeName, [UIColor whiteColor], NSForegroundColorAttributeName, nil];
    mainNavBar.titleTextAttributes = titleTextProperties;
    self.title = @"Pixel Coder";

    //build and add first conversion view
    CGRect firstConversionViewRect = CGRectMake(0.0f, 188.0f, 320.f, 73.0f);
    firstConversionView = [[UIView alloc] initWithFrame:firstConversionViewRect];
    firstConversionView.translatesAutoresizingMaskIntoConstraints = NO;
    firstConversionView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:firstConversionView];

    //build and add second conversion view
    CGRect secondConversionViewRect = CGRectMake(0.0f, 262.0f, 320.f, 76.0f);
    secondConversionView = [[UIView alloc] initWithFrame:secondConversionViewRect];
    secondConversionView.translatesAutoresizingMaskIntoConstraints = NO;
    secondConversionView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:secondConversionView];

    //build and add third conversion view
    CGRect thirdConversionViewRect = CGRectMake(0.0f, 339.0f, 320.f, 77.0f);
    thirdConversionView = [[UIView alloc] initWithFrame:thirdConversionViewRect];
    thirdConversionView.translatesAutoresizingMaskIntoConstraints = NO;
    thirdConversionView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:thirdConversionView];

    //constraints for conversion views
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(>=188)-[firstConversionView(73)]-1-[secondConversionView(76)]-1-[thirdConversionView(77)]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(firstConversionView, secondConversionView, thirdConversionView)]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[firstConversionView(320)]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(firstConversionView, secondConversionView, thirdConversionView)]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[secondConversionView(320)]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(firstConversionView, secondConversionView, thirdConversionView)]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[thirdConversionView(320)]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(firstConversionView, secondConversionView, thirdConversionView)]];


    //build and add percent UOM label
    CGRect percentUOMLabelRect = CGRectMake(260.0f, 20.0f, 30.0f, 30.0f);
    NSParagraphStyle *percentUOMLabelStyle = [NSParagraphStyle defaultParagraphStyle];
    NSDictionary *percentUOMLabelTextDictionary = [[NSDictionary alloc]initWithObjectsAndKeys:[UIFont fontWithName:@"Helvetica" size:24.0f], NSFontAttributeName,[UIColor whiteColor], NSForegroundColorAttributeName, percentUOMLabelStyle, NSParagraphStyleAttributeName, nil];
    NSAttributedString *percentUOMLabelText = [[NSAttributedString alloc] initWithString: @"%" attributes:percentUOMLabelTextDictionary];
    percentUOMLabel = [[UILabel alloc] initWithFrame:percentUOMLabelRect];
    percentUOMLabel.attributedText = percentUOMLabelText;
    percentUOMLabel.backgroundColor = [UIColor clearColor];

    //build and add ems UOM Label
    CGRect emsUOMLabelRect = CGRectMake(260.0f, 20.0f, 35.0f, 30.0f);
    NSParagraphStyle *emsUOMLabelStyle = [NSParagraphStyle defaultParagraphStyle];
    NSDictionary *emsUOMLabelTextDictionary = [[NSDictionary alloc]initWithObjectsAndKeys:[UIFont fontWithName:@"Helvetica" size:24.0f], NSFontAttributeName,[UIColor whiteColor], NSForegroundColorAttributeName, emsUOMLabelStyle, NSParagraphStyleAttributeName, nil];
    NSAttributedString *emsUOMLabelText = [[NSAttributedString alloc] initWithString: @"em" attributes:emsUOMLabelTextDictionary];
    emsUOMLabel = [[UILabel alloc] initWithFrame:emsUOMLabelRect];
    emsUOMLabel.attributedText = emsUOMLabelText;
    emsUOMLabel.backgroundColor = [UIColor clearColor];