[MonoTouch] XCode 4.2

[Nic Wise]

BTW, if you are thinking "thats very different to .NET!" - you are right.

Obj-C is not a method-call model. It's a message passing model. Think
of it like this:

.NET:

foo.DoSomething();

// COMPILER (or linker, or runtime) error if the version of the DLL
which has foo in it, doesn't have DoSomething()

in Obj-C, you are not calling a method, you are sending a message, so

[foo doSomething];

sends a message to foo, tells it to run doSomething. If it doesn't
have a doSomething, you get an exception (kinda) or it calls the
"missing method" routine. I think. But the linker doesn't care, nor
does the compiler (tho it checks). It's all dynamic at runtime.



On Mon, Oct 31, 2011 at 21:14, Nic Wise <nicw at fastchicken.co.nz> wrote:
> You dont need both installed.
>
> If you make an app with 4.2 (and MT5), it will work just fine on a
> iOS4 (or 3.1.3) device as long as you dont call any methods which are
> not available in the version your user is using.
>
> So lets say you have a class called UIMyCoolView. It has the following methods:
>
> void DoABasicFunction(); (available for 3.0 onwards)
> void DoSomethingSlightlyCooler(); (4.1 onwards)
> void DoSomethingInTheCloud(); (5.0 onwards)
>
> if you call
>
> var coolview = new UIMyCoolView();
> coolview.DoABacicFunction(); // this will work on all devices
> coolview.DoSomethingSlightlyCooler(); // this will crash / throw an
> exception on 4.0 or 3.x,  but work on 4.1 or better
> coolview.DoSomethingInTheCloud(); // will cash on 4.x or 3.x, workd on 5.x
>
> So, this piece of code is going to be VERY useful to you:
>
> public static bool IsIOS41OrBetter
>                {
>                        get
>                        {
>                                string version = UIDevice.CurrentDevice.SystemVersion;
>
>                                string[] versionElements = version.Split('.');
>
>                                if (versionElements.Length > 0)
>                                {
>                                        int versionInt = 0;
>                                        int minorVersion = 0;
>                                        if (Int32.TryParse(versionElements[0], out versionInt))
>                                        {
>                                                if (Int32.TryParse(versionElements[1], out minorVersion))
>                                                {
>                                                        if (versionInt >= 5) return true;
>
>                                                        return (versionInt >= 4 && minorVersion >= 1);
>                                                }
>                                        }
>
>                                        return false;
>
>                                }
>
>                                return false;
>
>                        }
>
>                }
>
> (4.1 is my minimim)
>
> this lets me doing things like this:
>
> public static UIKeyboardType DecimalKeyboardType
>                {
>                        get
>                        {
>                                if (IsIOS41OrBetter)
>                                {
>                                        return UIKeyboardType.DecimalPad;
>                                }
>                                return UIKeyboardType.NumbersAndPunctuation;
>                        }
>                }
>
> UIKeyboardType.DecimalPad only exists in 4.1 or newer.
>
> Does that make sense?
>
> This is why iPod Touch 3rd gen (basically, a 3G without the phone) are
> so valuable - you can keep them on 4.2 for testing, or better yet,
> keep them on 4.0 or 3.1.3 if you need to support that far back.
> Personally, I stop at 4.0 now.
>
>
>
> 2011/10/31 Andreas Ploetzeneder <info at ploetzeneder-it.com>:
>> Hi,
>> how can i make Adhoc distributions for devices with ioS 4 with Xcode 4.2 or
>> can i install it parallel to XCode 4.1
>>
>> --
>>
>>
>>
>>
>>
>> Mit freundlichem Gruß,
>>
>> Andreas Plötzeneder
>> CEO
>> ihr ploetzeneder it-solutions Team
>> Mobile Development – Desktopanwendungen – Webanwendungen
>> Tel:  +43 720 30 30 24 10
>> Fax: +43 720 30 30 24 20
>> Email: info at ploetzeneder-it.com
>> web:   http://www.ploetzeneder-it.com
>>
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>>
>>
>>
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>>
>
>
>
> --
> Nic Wise
> t.  +44 7788 592 806 | @fastchicken | http://www.linkedin.com/in/nicwise
> b. http://www.fastchicken.co.nz/
>
> Nearest Bus: find when the next bus is coming to your stop. http://goo.gl/Vcz1p
> mobileAgent (for FreeAgent): get your accounts in your pocket.
> http://goo.gl/IuBU
> Trip Wallet: Keep track of your budget on the go: http://goo.gl/ePhKa
> London Bike App: Find the nearest Boris Bike, and get riding! http://goo.gl/Icp2
>



-- 
Nic Wise
t.  +44 7788 592 806 | @fastchicken | http://www.linkedin.com/in/nicwise
b. http://www.fastchicken.co.nz/

Nearest Bus: find when the next bus is coming to your stop. http://goo.gl/Vcz1p
mobileAgent (for FreeAgent): get your accounts in your pocket.
http://goo.gl/IuBU
Trip Wallet: Keep track of your budget on the go: http://goo.gl/ePhKa
London Bike App: Find the nearest Boris Bike, and get riding! http://goo.gl/Icp2