Difference between revisions of "User:JRV"
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| − | Here, we develop a simple (Mac) Xcode project using Cocoa, the Interface |
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| − | Builder (IB). The project follows the Model-View-Control design pattern |
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| − | encouraged by Apple, with the View and Control entirely in Cocoa and IB, and |
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| − | the Model in Haskell. |
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| − | This is far from fulfilling the request found in the |
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| − | [[Missing_tutorials | Missing tutorials]] page. |
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| − | But it is a simple process, not requiring |
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| − | adding any Xcode plugins, or other extra applications. |
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| − | It assumes you know something about Xcode, and something about Haskell. |
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| − | Its not an objective-c bridge. |
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| − | == Why? == |
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| − | Why would you want to do this? Those with Xcode/Cocoa experience will not |
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| − | need an explanation. On the chance that someone else is browsing here, |
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| − | I'll list a few things. |
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| − | * Cocoa is not a language, it is a vast library of Objective-C objects. |
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| − | * Cocoa covers tasks such as: |
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| − | ** windowing, |
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| − | ** displaying tables, outlines, trees, |
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| − | ** text fields (with built in editing), |
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| − | ** pretty easy printing, with pdf automatically available, and |
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| − | ** on and on... |
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| − | * Objective-C is built on C, and is basically syntactic sugar for C. |
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| − | Together with Interface Builder, one can define most user interfaces with |
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| − | simple drag and drop from a library of element, then connect them with your |
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| − | code by dragging and drop in the IB screen. |
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| − | You automatically get full integration with the Mac system. You get the |
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| − | Mac Aqua look. |
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| − | Enough said. What Cocoa doesn't provide are the tools for mathematical |
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| − | modeling of an application domain that Haskell provides. Parsing comes |
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| − | immediately to mind. |
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| − | In the interest of full disclosure—I'm not an old time Mac person. I've |
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| − | had my Mac for two years. I only decided to learn Objective-C and Cocoa |
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| − | after I explored doing an application using Python and Qt, and someone in |
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| − | the Python community said “Objective-C is easy. Why don't you write a real |
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| − | Mac application”. Neither am I a Haskell expert. Although I've tinkered |
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| − | with Haskell for a long time (and it is probably my favorite language), |
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| − | I've just come back to it after a couple years away. |
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| − | == Overview == |
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| − | [[image:JRV_CocoaHaFib_before.png|thumb|350px|right]] |
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| − | Here are screen shost of the simple application we will develop. The first |
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| − | shows the application widow (together with the menu automatically generated |
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| − | by Xcode), ready to enter a number. |
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| − | The second shows the same scene after entering a number in the text box, |
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| − | and pressing “return”. |
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| − | The entire user interface was built in a short time using the graphical |
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| − | Interface Builder, by dragging text the entry box, and the labels from a |
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| − | library of “controls” onto the window. Notice that the labels are dynamic, |
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| − | in the line “Fibonacci Number for n = is: ”. |
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| − | I won't discuss Interface Builder any further in this tutorial. |
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| − | [[image:JRV_CocoaHaFib_after.png|thumb|350px|right]] |
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| − | == Compile Haskell module == |
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| − | == Import into Xcode project == |
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| − | == Compile and run == |
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| − | == To do == |
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