iTouch/iPhone SDKA study using Cognitive Dimensions

The Good

Interface Builder

Interface Builder•Can layout elements

(visibility & juxtaposability)

•Can sketch out UI without code (provisionality)

•UI Design and object modeling are separate(no premature commitments)

Interface Builder•Closeness of mapping

•Widget selections are easy to make.

•Icons look like iPhone widgets

•Readable names instead of NSScrollView

•Short and long docs

Interface Builder

Hidden Dependencies Hidden Dependencies are easy to seeare easy to see

Interface Builder

Hidden Dependencies Hidden Dependencies are easy to seeare easy to see

Interface Builder

Hidden Dependencies Hidden Dependencies are easy to seeare easy to seeHidden Dependencies Hidden Dependencies are easy to see.are easy to see.

(See File’s Owner)(See File’s Owner)

iPhone Simulator

•Progressive Evaluation

•Layout widgets first

•Add handlers and actions later.

•Supports some multi-touch

The Bad

Premature Commitment

•Need to decide your application type when creating a new project

Memory Management

•Hard mental operations

•Only 64 MB of memory, view are hogs

•No garbage collection

•Have memory leak, get killed

•Consistency

•alloc, dealloc, retain

Headers and Implementation

Separate Headers and

ImplementationHidden Consistencies

•name & setName

•@property and @synthesize builds getters and setters. Still need to deallocate.

Reflections on CD•Hard to know real problems without

experience of use. (viscosity)

•iPhone programming seems easy.

•Easy to find good things. Hard to find bad things

•Notation is mostly visual. More depth needed to understand APIs.

Otherwise lots of fun!