I was releasing an app to the the Apple App store tonight (actually two apps, I've done an Atley Hunter ;-) )

One of my apps encountered a problem when I tried to upload my archive:

"This bundle is invalid. The UIDeviceFamily key must be present when requiring a MinimumOSVersion of at least 3.2."

This did confuse me for a while, I did a bit of research and this information is supposed to be set automatically with XCode when I set the target platform.

Given I was using Xamarin Studio I was a little unsure where I stood so i took a shot in the dark.
I changed the platform in Xamarin to Universal and then back to iPhone/iPod problem solved,

hope this tip helps someone

Xamarin vs XCode

Anyone that reads this blog regularly or knows me, will know that I’m a C#/Java guy primarily, but I do love all other languages, especially javascript and objective-c  (my objective-c is just about passable, mainly because I’ve only written 3 iOS applications). I was in London this week and I got an early preview of a new service, it looked pretty good so I was thinking of how I could write a few of my own clients for this. I’ve the luxury of being in a position to take a few approaches .

Client options

• Html5 Desktop Client
• iOS native client
• Droid native client (I’ve never strictly speaking done one, unless you include my hello world post two years back)
• PhoneGap/KendoUi iPad/Droid apps (I’m doing the phone apps for my Expenses service with these technologies).

Decisions tree

My first instinct was to go the PhoneGap with KendoUI, I actually did the initial layout and had a look in the Android Emulator and it was pretty nice (as I was in London I didn’t have my MacBookAir with me and I didn’t have the Visual Studio Phone Tools installed either so eclipse/android it was with that painfully slow emulator). The problem I encountered with this approach was that CORS was not enabled by default and I use visual studio to develop design debug (PhoneGap can do CORS once the site is white listed).

My next option was to write the native clients, when I arrived back home I quickly ensured I could connect to the server with basic authentication, I used objective-C firstly, I didn’t use any 3rd party libraries and the end result appears a little verbose (a better iOS developer will probably cry when they look at these screenshots and tell me use AFNetworking or blocks etc (which I used in my BrianKeating.net companion app).

XCode Version

Make the initial request and delegate to the view class.

Here i set the username and password for the request when/if challenged.

Here i allocate a place to store the response if it’s was a success and save to data into urlData.

Here I list all the key value pairs in the JSON returned (something I  don’t actually show in the c# version.

The attraction of XCode/Objective-C to me is that it’s a different toy to play with.

MonoDevelop Version

C# is just a fantastic language it’s RAD and Xamarin have done a fantastic job of bringing it to the iOS and Android Platforms. This  screen shot shows the same request to the server as done in XCode, the difference is that this took me about 1 minute where the objective-c version took me about 25 (although i did reuse the storyboard).

You said Decision?

So how will I proceed? I’m going to ditch the objective-C approach for sure:

Reasons:

• It’s so much faster! I love C++ but can’t get myself to use it for app dev these days simply because C# kicks it to touch for rapid application development, same goes for Objective-C
• Because I don’t expect to continue this POC myself and will have to hand it over to someone, and I don’t know anyone else on the team that knows objective-C.

I’m actually still leaning towards the PhoneGap/KendoUI option, I just need to get my grubby hands on the server so i can add the CORS headers (again because I don’t want to do the bulk of my debugging with Phone gap but rather IE/Chrome and I quite like my browser stack (jQuery/Knockout/Breeze etc) but the main advantage is that the the same source can then be used for the Android platform. Sure Facebook/LinkedIn etc have all been moving away from html5 because of the tooling, but I feels it’s the best solution for getting to both markets quickly.

So that is my reasoning, I expect everyone with be faced with much the same decisions and will have to weight the pros and cons themselves.