Chris' Blog.

My occasional thoughts on iOS development, developers careers, trying to make an income from the App Store, and updates on life in general.

Enum-Driven View Controllers

Have you ever seen the term 'MVVM' (Model-View-ViewModel) and been intimidated by yet another acronym in our industry that you don't understand? In this article, I'll explain how you are very likely already doing MVVM, and you'll see how to tidy it up into a neat little state machine.

What you're probably doing

You're probably doing something like this in your view controllers. Nothing wrong with it, it's a good place to start:

class ProductListViewController: UIViewController {
    var isLoaded: Bool = false
    var isLoading: Bool = false
    var products: [Product]?
    var error: NSError?

See those four instance variables? Those are your ViewModel - see, you're doing MVVM already, without realising it - no big deal.

So here's a few stabs at a working definition of a ViewModel: It's the variables that drive what is being viewed. Or the model for what's happening in your views. As opposed to your real model, which has eg Products, Customers, Orders, etc.

Your VC is probably a state machine

A 'state machine' is one of those computer-science concepts that goes pretty deep. But for our purposes, all I mean is that your view controller has a limited set of possible states it can be in.

Here's a good analogy: It's very much like the gear selector in your car, you only have limited options: F, N, R, D (or 1..5+R if you love driving a manual!).

So what are the kind of states you're likely to see in a view controller:

  • Loading
  • Empty (loaded but there's no data, eg inbox zero!)
  • Loaded
  • Error
  • Not logged in (eg cannot load)

So lets bring the ViewModel and state machine concepts together into one nice package.

Enums to the rescue

Now if the above sounds like an Enum, you're right! So lets tidy up our original bunch of variables into an enum and a single state variable - emphasis on single:

class ProductListViewController: UIViewController {
    enum State {
        case Loading
        case Empty
        case Loaded([Product])
        case Error(NSError)
    var state = State.Loading

One advantage here is that there is zero ambiguity about which state you're in. In the earlier example, it is possible for isLoaded and isLoading to both be true if you make a coding mistake, which is a confusing situation. But with an enum that is simply impossible.

Make the Enum drive the views

Next, I recommend using a didSet handler on the variable to update your UI. Eg:

var state = State.Loading {
    didSet {
        ... update views ...

Now it's a simple matter of simply setting the value of the state variable whenever you want your UI to change. Eg your data fetching code will look as simple as the following:

func loadProducts() {
    state = .Loading
    ProductManager.sharedManager.requestProducts(success: { products in
        if products.count > 0 {
            self.state = .Loaded(products)
        } else {
            self.state = .Empty
    }, failure: { error in
        self.state = .Error(error)

To make the above example make more sense, here's some example code for the product manager:

struct Product {
    // ...

class ProductManager {
    static let sharedManager = ProductManager()
    func requestProducts(
            success success: [Product] -> (),
            failure: NSError -> ()) {
        // ...

Table example

And for the sake of a half-fleshed-out example, here's something I commonly do: I have a view controller with a table view. For the loaded state, normal data rows show. For error state, one entire-screen-height cell shows with an error message. For empty state, one big cell with a helpful message shows. And for loading state, we have one big cell with an activity indicator. It all comes together beautifully as we'll go over now:

When setting the state, all that is required to update is to call the table's reloadData method:

var state = State.Loading {
    didSet {

The table data source then looks like below. It is responsible for showing one special cell for the loading/empty/error states, as well as the typical product cells:

extension ProductsViewController: UITableViewDataSource {

    func tableView(tableView: UITableView,
            numberOfRowsInSection section: Int) -> Int {
        switch state {
        case .Loading, .Empty, .Error:
            return 1
        case .Loaded(let items):
            return items.count

    func tableView(tableView: UITableView,
            cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        switch state {
        case .Loading:
            return tableView.dequeueReusableCellWithIdentifier(LoadingCell.cellId, forIndexPath: indexPath)
        case .Error(let error):
            let cell = tableView.dequeueReusableCellWithIdentifier(CaptionCell.cellId, forIndexPath: indexPath) as! CaptionCell
            cell.caption.text = error.localizedDescription
            return cell
        case .Empty:
            let cell = tableView.dequeueReusableCellWithIdentifier(CaptionCell.cellId, forIndexPath: indexPath) as! CaptionCell
            cell.caption.text = "There are no products to view today, sorry!"
            return cell
        case .Loaded(let products):
            let product = products[indexPath.row]
            let cell = tableView.dequeueReusableCellWithIdentifier(ProductCell.cellId, forIndexPath: indexPath) as! ProductCell
            cell.textLabel?.text =
            cell.detailTextLabel?.text = product.description
            return cell


And the table view delegate is responsible for making those special cells fill the whole screen:

extension ProductViewController: UITableViewDelegate {

    func tableView(tableView: UITableView,
            heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        switch state {
        case .Loading, .Empty, .Error:
            return tableView.bounds.height
        case .Loaded:
            return tableView.rowHeight


And that's pretty much it for this post! Read on if you're curious about advanced enums.

Nested enums

A friend asked me to write about this one: An interesting technique you can use is nested enums. Now it can be a bit over-the-top, so use it judiciously, but here goes:

Say your state machine, when drawn out on paper, consists of maybe two 'top-level' states, but if you drill down there are more subtle states that are possible. Basically a hierarchy of states, like so:

Logged in
Logged out

You may want to consider nesting your enums like so:

enum UserState {
    case LoggedIn(LoggedInState)
    case LoggedOut(LoggedOutState)

enum LoggedInState {
    case Playing
    case Paused
    case Stopped

enum LoggedOutState {
    case Unregistered
    case Registered

var x = UserState.LoggedIn(.Playing)
var y = UserState.LoggedIn(.Stopped)
var z = UserState.LoggedOut(.Unregistered)

I'll leave this as an exercise to the reader.

Hope this has been helpful!

Status bar colours

Did you know that UIApplication.setStatusBar[Style|Hidden] has been deprecated in iOS9? We all know that Apple are ruthless in deprecating old API's, so it's time that we got on board with the new(ish) viewcontroller-based status bar style API's. Here's everything you need to know:


It's now deprecated to have UIViewControllerBasedStatusBarAppearance=NO in your Info.plist file. It was common for people to use this as the 'nuclear option' - that is, you set your status bar style in the plist and it overrides the entire app. I can empathise with developers taking this shortcut but we really shouldn't any more. I recommend removing this key from the plist entirely (as opposed to setting it to YES).

You'll still want to use the following keys to set the status bar style for your launch screen, since the launch screen is visible before any code runs:

  • UIStatusBarHidden aka "Status bar is initially hidden"
  • UIStatusBarStyle aka "Status bar style"


So we should all now be using the following in (most of) our view controllers. I'll get to why I said 'most of' later...

  • preferredStatusBarStyle (white or black status bar content)
  • preferredStatusBarUpdateAnimation ("Specifies the animation style to use for hiding and showing the status bar for the view controller")
  • prefersStatusBarHidden

In Swift, it looks like doing the following in your UIViewController subclass:

override func preferredStatusBarStyle() -> UIStatusBarStyle {
    return .LightContent
override func prefersStatusBarHidden() -> Bool {
    return true
override func preferredStatusBarUpdateAnimation() -> UIStatusBarAnimation {
    return .Slide

FYI: they have to be overridden functions instead of setting them as variables because they are methods not properties in the UIViewController source .

Note: You don't need to override all these methods every time, only where you depart from the default style, which is black+visible+fade, respectively.

And if your view controller ever needs to change its status bar for some reason, simply call setNeedsStatusBarAppearanceUpdate and change the code in your preferredStatusBarStyle to reflect whatever you want it to look like.

Navigation Controllers

It all gets more 'interesting' when there's a UINavigationController involved. And by 'interesting' I mean 'a little complicated'. But read on and you'll be fine, and hopefully you'll get back to feeling like you're in control of your status bars.

And this is why I said 'most of' earlier - oftentimes, view controllers inside a navigation controller don't need an explicit style since the navigation controller dictates the status bar style.

So here's the rule of thumb:

If the navigation controller's navigation bar is visible, then it is responsible for the status bar

In other words:

  • If UINavigationController.navigationBarHidden = false, the UINavigationController's preferredStatusBarX methods are called, after all it is displaying the content under the status bar.
  • If UINavigationController.navigationBarHidden = true, the child UIViewController's preferredStatusBarX methods are called, since the child is displaying the content under the status bar.

Here's a twist: If you don't like the above behaviour, and would like your navigation controller to pass on responsibility for the status bar to the child view controllers for some reason, you can't simply subclass UINavigationController, override preferredStatusBarX, and call through to topViewController. This is because UIKit has a private mathod called UIApplication._updateCurrentStatusBarViewControllerAppearance, which in turn calls your nav controller's _currentStatusBarHiddenViewController to get the child, then calls the child directly, leaving your nav controller out of the loop with no way to intervene. So don't bother trying unless you want to burn several hours like I did.

Now, UINavigationController isn't really designed to be subclassed. So you're not supposed to subclass it and override preferredStatusBarStyle to get white status bar content. Instead, the colour of the status bar comes from navigationBar.barStyle: .Default = black status bar content; .Black = white status bar content.

Important: So if you're setting barTintColor to your brand's colour (which you likely are), you also need to set barStyle to .Black to get white status bar content. I'd set barStyle to black before setting barTintColor, in case barStyle overrides the barTintColor for whatever reason.


Modals act as you'd expect: A modally displayed UINav with a navigation bar dictates the colour via the barStyle, otherwise UIViewController's preferX get called. However, there's one more twist:

Modally displayed UIViewController's only get a say in the status bar if modalPresentationStyle = .FullScreen. Other presentation styles don't get a say in the status bar by default. I guess UIKit assumes that partial-screen modals (eg a UIAlertController) don't cover the status bar - a reasonable assumption!

However, if you've got a custom presentation style modal view controller and you really want it to control the status bar for some reason, you can override modalPresentationCapturesStatusBarAppearance to return true.

That's it! Everything you wanted to know about how to get that status bar to do what you wanted.

An Android Server

Source code can be found here:

Summary: To make a persistent Android server, you'll need a Wake Lock, a Wifi Lock, and a Foreground Service.

How to use an Android phone as a [web] server

For a change of pace, I've been experimenting with using cheap Android phones as servers. I've been toying with the idea of getting some Raspberry Pis for various uses, however they're quite expensive in Australia, and cheap android phones go for $20 a pop. So i've been playing with them, to see what I could come up with.

So I wanted an android phone that acts as a web server, getting content from a Samba server. The Samba server in my case is my router, which exposes any USB drive via Samba. I wanted it to serve up via HTTP, so that I could use it to play movies etc from. And i got it to work!

You will likely be reading this article for the information about how to run a long-running Android server mainly, and will likely be less interested in my Samba stuff. So I'll skim over that.


I recommend using NanoHTTPD, it's a simple embeddable Java web server. Simply download its JAR, go to the project view, drag it into MyApp/app/libs, right click it and select the option to include it in your project via gradle.

Next, create a subclass of NanoHTTPD for your server. The only interesting method you need to override is serve. For example, here is some stuff I've been doing with it, but of course yours will vary significantly depending on what you actually want to do:

public Response serve(IHTTPSession session) {
    Log.d("MyHTTPD", "Serve called...");

    String uri = session.getUri();
    if (uri.equals("/api/foo")) {
        try {
            SmbFile smbFile = new SmbFile("smb://admin:[email protected]/usb1_1/");
            JSONArray list = new JSONArray();
            for (String file: smbFile.list()) {
            String json = list.toString(1);
            return newFixedLengthResponse(json);
        } catch (Exception e) {
            return newFixedLengthResponse("<html><body>Error: " + e.toString());
    } else {

        // Browse.
        try {
            SmbFile smbFile = new SmbFile("smb://admin:[email protected]/usb1_1" + uri);
            if (smbFile.isDirectory()) {
                String html = "<html><body>";
                // ListFiles seems to be really slow - does that matter once we're up and running?
                for (SmbFile file : smbFile.listFiles()) {
                    html += "<p><a href='" + file.getName() + "'>" + file.getName() + "</a>";
                    if (file.isDirectory()) {
                        html += "<a href='" + file.getName() + "hls.m3u8'>HLS</a>";
                    html += "</p>";
                return newFixedLengthResponse(html);

            } else if (smbFile.isFile()) {
                String mime = "application/octet-stream";
                String name = smbFile.getName();
                if (name.endsWith(".m3u8")) {
                    mime = "application/x-mpegURL";
                } else if (name.endsWith(".ts")) {
                    mime = "video/MP2T";
                Log.d("MyMedia", "serving: " + name + "; mime: " + mime);
                return newChunkedResponse(Response.Status.OK, mime, smbFile.getInputStream());
            } else {
                return newFixedLengthResponse("<html><body>Not a file or dir, uri: " + uri);
        } catch (Exception e) {
            return newFixedLengthResponse("<html><body>Error: " + e.toString());

You've now got your NanoHTTPD server created. It's not android-specific code at all at this stage, next we need to make it work as an Android service.


Next make a subclass of, to fit into Android's ecosystem. This is responsible for the following:

  • Starting the NanoHTTPD service
  • Keeping the CPU awake
  • Keeping the Wifi awake
  • Registering as a 'foreground service' so that Android doesn't simply shut us down after a while.

It looks like this:

public class MyHttpService extends Service {

    public Context context = this;
    public Handler handler = null;
    public static Runnable runnable = null;
    PowerManager powerManager;
    PowerManager.WakeLock wakeLock;
    WifiManager.WifiLock wifiLock;

    private MyHTTPD httpd;

    public IBinder onBind(Intent intent) {
        return null;

    public int onStartCommand(Intent intent, int flags, int startId) {
        // Start the httpd.
        try {
            httpd = new MyHTTPD();
        } catch (IOException e) {
            Toast.makeText(this, "Service failed to start.", Toast.LENGTH_LONG).show();

        // Keep the CPU awake (but not the screen).
        powerManager = (PowerManager)getSystemService(Context.POWER_SERVICE);
        wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Httpd");

        // Keep the WIFI turned on.
        WifiManager wm = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
        wifiLock = wm.createWifiLock(WifiManager.WIFI_MODE_FULL_HIGH_PERF, "Httpd");

        // Become a foreground service:
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, DashboardActivity.class), 0);
        // Set the info for the views that show in the notification panel.
        Notification notification = new Notification.Builder(this)
                .setSmallIcon(R.drawable.ic_sync_black_24dp)  // the status icon
                .setTicker("My service")  // the status text
                .setWhen(System.currentTimeMillis())  // the time stamp
                .setContentTitle("Http")  // the label
                .setContentText("My service")  // the contents of the entry
                .setContentIntent(contentIntent)  // The intent to send when clicked
        startForeground(1, notification);

        return Service.START_STICKY;

    public void onDestroy() {


Potential ARP issues

I've had issues with my server dropping off the network intermittently then coming back hours later. I've been advised this is a bug in the Android kernel not performing a proper ARP advertisement, and have been told to either try a different device, or a newer Android version, or a static IP address, or anything else. You may want to watch out for this. In the end this problem defeated my plans for an Android server but hopefully your mileage may vary.

Main activity

You'll need an activity for your main UI. (iOS friends: an activity is a view controller). In your activity, add a button, and give it a click handler in the layout xml like so: android:onClick="onStartHttpServer".

In your activity class, you'll need to implement the aforementioned method to start our web service. It'll look like so:

public void onStartHttpServer(View v) {
    Intent intent = new Intent(this, MyHttpService.class);

Thanks for reading! And again, you can find the source here: Source code can be found here: . Hope you found this helpful, or at least mildly interesting in the case of my typical iOS readers!

You can see older posts in the right panel, under 'archive'.


Enum-Driven View Controllers 3 Jan 2016

Status bar colours: Everything there is to know 30 Dec 2015

Android server 20 Dec 2015

Generating heightmap terrain with Swift 8 Nov 2015

Swift Education Screencasts 27 Oct 2015

Swift Image Cache 24 Sep 2015

Don't be slack 13 Sep 2015

Swift KVO alternative 23 Jul 2015

Swift Keychain wrapper 21 Jun 2015

Swift NSURLSession wrapper 12 Jun 2015

iOS8 View Controller transitioning bug 17 Apr 2015

IB Designable 18 Mar 2015

iOS App Architecture 2 Mar 2015

Video Course Launch 14 Feb 2015

Video Course Pre-launch 8 Feb 2015

Blogging Platforms 13 Jan 2015

Mobile in 2014 - Year in Review 11 Jan 2015

Secret Keys talk 16 Nov 2014

Dimmi 11 Nov 2014

Project setup in Xcode6 22 Oct 2014

Uploading to an S3 bucket from iOS 15 Oct 2014

iOS8 App Testing Roundup 28 Sep 2014

Storing obfuscated secret keys in your iOS app 16 Sep 2014

Getting Core Location / CLLocationManager to work on iOS8 14 Sep 2014

Accessing the response body in failure blocks with AFNetworking 2 10 Sep 2014

How to allow your UITextFields to scroll out of the way of the keyboard 8 Sep 2014

How to subclass UIButton in iOS7 and make a UIButtonTypeSystem 4 Sep 2014

New season 1 Aug 2014

House finished 17 Jun 2014

WebP decoding on iOS 9 Feb 2014

Moving on again 22 Jan 2014

Lossy images for retina iPads - JPEG vs WebP 30 Nov 2013

Career options I wish I knew about when I was younger 20 Oct 2013

Positivity and your friends 7 Oct 2013

Tactility 26 Jul 2013

WWDC-induced narcolepsy 15 Jul 2013

Back on rails 31 May 2013

Full circle 6 May 2013

Programmatic UI on iOS 3 May 2013

Screencasts and positivity 8 Apr 2013

Year of positivity 14 Mar 2013

iOS Dev State of the Union 6 Feb 2013

Adventures with IAPs 3 Feb 2013

No longer a Googler 23 Dec 2012

Localising iPhone apps with Microsoft Translator 8 Dec 2012

Fight back (app biz update 13) 12 Nov 2012

Sent to the backburner (app biz update 12) 25 Oct 2012

Lisi Schappi 7 Oct 2012

Today's happy plateau (app biz update 11) 26 Aug 2012

First week's sales of Today (app biz update 10) 19 Aug 2012

Today launch! And a difficult decision made... (app biz update 9) 15 Aug 2012

Approved! (app biz update 8) 5 Aug 2012

Creating a graph in Objective-C on the iPhone 3 Aug 2012

Hurry up and wait (app biz update 7) 30 Jul 2012

Today app marketing site 27 Jul 2012

Today app submitted 25 Jul 2012

UIAlertView input wrapper 24 Jul 2012

Mentoring 23 Jul 2012

This is too hard! (app biz update 6) 20 Jul 2012

Perspectives (app biz update 5) 9 Jul 2012

4th starting-my-own-biz update 1 Jul 2012

ScrumFox landing page 28 Jun 2012

Server Scope landing page 27 Jun 2012

Telstra Calls and Data Usage 26 Jun 2012

Service History + Dropbox 26 Jun 2012

Impromptu Presenter 26 Jun 2012

Fertility Tracker 26 Jun 2012

Baby Allergy Tracker 26 Jun 2012

Starting my own business, update 3 22 Jun 2012

Starting my own business, update 2 17 Jun 2012

Starting my own business - First update 10 Jun 2012

I must be crazy 6 Jun 2012

Finding your location on an iPhone 7 May 2012

A generous career 4 May 2012

Skeleton Key Cocoaheads presentation 3 May 2012

CHBgDropboxSync - Dropbox auto-sync for your iOS apps 1 May 2012

That book about that Steve Jobs guy 30 Apr 2012

Another app marketing idea 23 Apr 2012

Sweet grouped tables on the iPhone 17 Apr 2012

Skeleton Key App 11 Apr 2012

Another app marketing idea... 5 Apr 2012

Quickly check for any missing retina graphics in your project 3 Apr 2012

Skeleton Key Password Manager with Dropbox 2 Apr 2012

RC Boat motor finally mounted 2 Apr 2012

Promoting apps presentation slides 1 Apr 2012

How i just wasted a month on my latest app, and how you don't need to 26 Mar 2012

The Finishing Line 20 Mar 2012

Using Launchd to run a script every 5 mins on a Mac 20 Feb 2012

Generating AES256 keys from a password/passphrase in ObjC 20 Feb 2012

Indie iPhone app marketing, part 2 19 Feb 2012

My App Manifesto: Syncing + Dropbox + YAML = Awesome 15 Feb 2012

Indie iPhone App Marketing part 1 7 Feb 2012

Perspectives 2 Feb 2012

Accountability and Free Will 1 Feb 2012

Badassery 31 Jan 2012

Sacrifice 30 Jan 2012

Lead Yourself First 29 Jan 2012

How to ping a server in Objective-C / iPhone 26 Jan 2012

iOS Automated Builds with Xcode4 16 Jan 2012

Xcode 4 - Command line builds of iPhone apps 15 Jan 2012

Guest post by Jason McDougall 13 Jan 2012

Scouts, Games and Motivation 10 Jan 2012

2011 Re-cap 8 Jan 2012

Ruby script to increment a build number 4 Jan 2012

Turning 30? All ideas, no execution? 18 Dec 2011

CHDropboxSync - simply sync your iOS app's documents to Dropbox 14 Dec 2011

Deep-enumerating a directory on the iphone, getting file attributes as you go 10 Dec 2011

Getting a date without the time component in objective-c 6 Dec 2011

Memory management in Objective-C 4 Dec 2011

Starting small 29 Nov 2011

Dictionary Types Helper 29 Nov 2011

Observer Pattern in Objective-C 16 Nov 2011

Why you should give presentations 13 Nov 2011

How to get a programming or design job in Sydney 9 Nov 2011

Custom nav bar / toolbar backgrounds in iOS5 8 Nov 2011

Stuck 27 Oct 2011

Dead easy singletons in Obj-C 19 Oct 2011

JSON vs OCON (Objective-C Object Notation) 18 Oct 2011

In defence of Objective-C 16 Oct 2011

Update the MessagePack objective-c library to support packing 12 Oct 2011

Icons 11 Oct 2011

How to host a site on Amazon AWS S3, step-by-step 7 Oct 2011

Drawing a textured pattern over the default UINavigationBar 6 Oct 2011

Markdown Presentations 1 Oct 2011

More MegaComet testing: Ruling out keepalives 15 Sep 2011

MegaComet test #4 - This time with more kernel 14 Sep 2011

Building People 10 Sep 2011

Half way there: Getting MegaComet to 523,000 concurrent HTTP connections 5 Sep 2011

Making a progress bar in your iPhone UINavigationBar 22 Aug 2011

Hacker News Reader 20 Aug 2011

How to programmatically resize elements for landscape vs portrait in your iphone interface 16 Aug 2011

MegaComet testing part 2 3 Aug 2011

Australian Baby Colours 28 Jul 2011

Boat prop shaft 25 Jul 2011

Megacomet with 1 million queued messages 24 Jul 2011

Installed the strut and rudder 18 Jul 2011

Painted the inside of the boat 17 Jul 2011

Fuzzy iphone graphics when using an UIImageView set to UIViewContentModeCenter 13 Jul 2011

My 3 Data and Calls Usage 11 Jul 2011

Reading a line from the console in node.js 10 Jul 2011

Trim whitespaces on all text fields in a view controller 9 Jul 2011

Final finish 9 Jul 2011

MessagePack parser for Objective-C / iPhone 30 Jun 2011

Lacquering the starboard side 25 Jun 2011

What do do with EXC_ARM_DA_ALIGN on an iPhone app 23 Jun 2011

Lacquering the hull 23 Jun 2011

Staining the boat 22 Jun 2011

NSMutableSet with weak references in objective-c 20 Jun 2011

Iphone gesture recogniser that works for baby games 20 Jun 2011

Image manipulation pixel by pixel in objective C for the iphone 19 Jun 2011

Baby Allergy Tracker 12 Jun 2011

Power sanding the deck 10 Jun 2011

Planing the edge of the deck 2 Jun 2011

Figured out the deck 2 Jun 2011

Boat bulkheads 2 Jun 2011

Simulating iOS memory warnings 31 May 2011

Putting a UIButton in a UIToolbar 29 May 2011

How to allow closing a UIActionSheet by tapping outside it 29 May 2011

Finding the currently visible view in a UITabBarController 24 May 2011

Random Chef 17 May 2011

Centered UIButton in a navigation bar on the iphone 16 May 2011

Little Orchard 13 May 2011

Boat update 13 May 2011

How to get the current time in all time zones for the iphone / obj-c 12 May 2011

Design portfolio 10 May 2011

Tricks with grand central dispatch, such as objective-c's equivalent to setTimeout 9 May 2011

How to make an iphone view controller detect left or right swipes 5 May 2011

Centered section headers on a UITableView 5 May 2011

Christmas in may 4 May 2011

Finished trimming the boat (its floatable now!) and got some parts 29 Apr 2011

How to make a multiline label with dynamic text on the iphone and get the correct height 27 Apr 2011

Forcing an image size on the image in a table view cell on an iphone 20 Apr 2011

Git on the Mac 19 Apr 2011

Build a url query string in obj-c from a dictionary of params like jquery does 12 Apr 2011

Rendering a radial gradient on the iphone / objective-c 11 Apr 2011

Skinning the port side of the boat 8 Apr 2011

Skinning the side of the boat 5 Apr 2011

Sending a UDP broadcast packet in C / Objective-C 5 Apr 2011

How to talk to a unix socket / named pipe with python 4 Apr 2011

Skinning the bottom of the boat 31 Mar 2011

Service discovery using node.js and ssdp / universal plug n play 30 Mar 2011

Extremely simple python threading 29 Mar 2011

New rescue boat 26 Mar 2011

HttpContext vs HttpContextBase vs HttpContextWrapper 5 Nov 2010

Simple C# Wiki engine 30 Sep 2010

Simple way to throttle parts of your Asp.Net web app 29 Sep 2010

How to implement DES and Triple DES from scratch 4 Aug 2010

How to use sessions with Struts 2 30 Jul 2010

How to use Cookies in Struts 2 with ServletRequest and ServletResponse 30 Jul 2010

Using Quartz Scheduler in a Java web app (servlet) 27 Jul 2010

Javascript date picker that Doesn't Suck!(tm) 27 Jul 2010

Using Oracle XE with Hibernate 20 Jul 2010

A simple implementation of AES in Ruby from scratch 29 Jun 2010

Asp.Net Forms authentication to your own database 28 May 2010

AS2805 (like ISO8583) financial message parser in C# 7 May 2010

Ruby hex dumper 4 May 2010

Using Spring to manage Hibernate sessions in Struts2 (and other web frameworks) 13 Jan 2010

Emails in C#: Delivery and Read receipts / Attachments 12 Jan 2010

Using Java libraries in a C# app with IKVM 16 Dec 2009

Learning Java tutorial 27 Nov 2009

Using generic database providers with C# 17 Nov 2009

Scheduled task executable batch babysitter 29 Oct 2009

Working with query strings in Javascript using Prototype 30 Sep 2009

Still fighting with String.Format? 9 Sep 2009

How I'd build the next Google 24 Aug 2009

Getting IIS and Tomcat to play nicely with isapi_redirect 24 Aug 2009

Using the new ODP.Net to access Oracle from C# with simple deployment 11 Aug 2009

C# Cryptography - Encrypting a bunch of bytes 14 Jul 2009

Sorting enormous files using a C# external merge sort 10 Jul 2009

Reconciling/comparing huge data sets with C# 9 Jul 2009

Some keyboard-friendly DHTML tricks 10 Jun 2009

How to figure out what/who is connected to your SQL server 18 Mar 2009

Adding a column to a massive Sql server table 16 Mar 2009

Multithreading using Delegates in C# 10 Mar 2009

Using C# locks and threads to rip through a to-do list 6 Feb 2009

Using threads and lock in C# 3 Feb 2009

Compressing using the 7Zip LZMA algorithm in C# beats GZipStream 14 Jan 2009

MS Sql Server 2005 locking 17 Dec 2008

Simple Comet demo for Ruby on Rails 19 Nov 2008

Geocoding part 2 - Plotting postcodes onto a map of Australia with C# 24 Oct 2008

Using evolutionary algorithms to make a walkthrough for the light-bot game with C# 20 Oct 2008

How to tell when memory leaks are about to kill your Asp.Net application 16 Oct 2008

C# version of isxdigit - is a character a hex digit? 15 Sep 2008

Geocoding part 1 - Getting the longitude and latitude of all australian postcodes from google maps 26 Aug 2008

Converting HSV to RGB colour using C# 14 Aug 2008

Opening a TCP connection in C# with a custom timeout 11 Aug 2008

Oracle Explorer - a very simple C# open source Toad alternative 31 Jul 2008

Linking DigitalMars' D with a C library (Mongrel's HTTP parser) 23 Jun 2008

Connecting to Oracle from C# / Winforms / without tnsnames.ora 16 Jun 2008

A simple server: DigitalMars' D + Libev 6 Jun 2008

Travelling from Rails 1 to Rails 2 9 Apr 2008

Online Rostering System 9 Apr 2008

DanceInforma 9 Apr 2008

Using RSS or Atom to keep an eye on your company's heartbeat 10 Nov 2007

Easy Integrated Active Directory Security in ASP.Net 24 Oct 2007