Adopting MVC in Cocoa

by Graham Lee on Jul 08, 2009

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A presentation I delivered to ACCU in 2009 about using MVC (model-view-controller) in Cocoa to make best use of the frameworks and maximise code reuse.

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A presentation I delivered to ACCU in 2009 about using MVC (model-view-controller) in Cocoa to make best use of the frameworks and maximise code reuse.

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Adopting MVC in Cocoa — Presentation Transcript

Adopting Model-View- Controller in Cocoa and Objective-C Graham Lee http://twitter.com/iamleeg

Memory Lane

Memory Lane • 1980s: Brad Cox at StepStone adds Smalltalk messaging to C. Some guy named Bjarne invents “C with Classes”.

Memory Lane • 1980s: Brad Cox at StepStone adds Smalltalk messaging to C. Some guy named Bjarne invents “C with Classes”. • 1986: Cox authors Object Oriented Programming: an evolutionary approach, ObjC is born • 1988: NeXT licence ObjC from StepStone • 1993: GCC runtime for ObjC on !NeXT OS

What does MVC mean?

What does MVC mean? Display information Prepare content Provide information

What does MVC mean? Respond to events Display information Trigger service logic Prepare content Do the work Provide information

Demo - one-minute browser

What did I do?

What did I do? • Drew boxes in Interface Builder

What did I do? • Drew boxes in Interface Builder • Automatically created and archived View objects

What did I do? • Drew boxes in Interface Builder • Automatically created and archived View objects • Automatically un-archived and displayed by my app

What did I do? • Drew boxes in Interface Builder • Automatically created and archived View objects • Automatically un-archived and displayed by my app • MVC score: F Should really try harder

On syntax

On syntax • [anObject sendMessage: parameter];

On syntax • [anObject sendMessage: parameter]; • @property int count; • int x = anObject.count; • anObject.count = x * 2;

Demo - model the URL

MVC Score: D Principles not really applied

Delegates

Delegates • Customise an object’s behaviour by making decisions on its behalf

Delegates • Customise an object’s behaviour by making decisions on its behalf • GoF: Template Method (kindof)

Delegates • Customise an object’s behaviour by making decisions on its behalf • GoF: Template Method (kindof) • Implement a subset of delegate methods, runtime introspection avoids exceptions

Delegates • Customise an object’s behaviour by making decisions on its behalf • GoF: Template Method (kindof) • Implement a subset of delegate methods, runtime introspection avoids exceptions • We’ll use WebFrameLoadDelegate

Demo - ﬁx the address bar

Demo - ﬁx the address bar (oh, and add window titles)

Cocoa Bindings

Cocoa Bindings «bind»

Cocoa Bindings «bind» «observe»

MVC Score: B Good, but I want bookmarks ☺

Demo - bookmarks

MVC Score: A That’ll do for now!

Adopting MVC in Cocoa

by Graham Lee on Jul 08, 2009

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Adopting MVC in Cocoa — Presentation Transcript