Comments on: 8 Tips & Tricks When Starting Objective-C iPhone Apps: [self.paradigm shiftFrom:@"ruby" to:@"objective-c"];

By: Beata Jane R

Beata Jane R — Wed, 13 Jul 2011 07:36:13 +0000

Hi Josh Symonds,
Good article on programing with objective .

By: Paul Freeman

Paul Freeman — Tue, 09 Feb 2010 14:08:17 +0000

Tip 9.

Always run a ‘Build and Analyze’ whenever convenient (it takes a bit longer than a regular build), the analysis option will detect some potential memory management issues and you will find them at compile time instead of waiting until your testing, or Apples app certifiers, or your customers find them…

You need XCode 3 on Snow Leopard for the Analyze feature.

By: links for 2009-01-22 at adam hoyle presents suckmypixel

links for 2009-01-22 at adam hoyle presents suckmypixel — Thu, 22 Jan 2009 13:02:03 +0000

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By: Matt Gallagher

Matt Gallagher — Sun, 26 Oct 2008 23:22:25 +0000

Quick point: you meant “id”, not “id *”. The typedef for “id” is “struct objc_object *” (i.e. the pointer is already incorporated into it as part of the name). Yes, it makes it look inconsistent… oh, well.

It is not strictly true that id must refer to an NSObject *. It can be any object (including rarely used non-NSObject objects).

What makes id particularly special is that the compiler will let you down-cast without complaint. Try to implicitly use an NSObject * as an NSString * and the compiler will give a warning that they may not be the same thing. Implicitly use an id as an NSString * and it will let you — id is the universal type. Implicit upcasting (i.e. NSString * to NSObject *) is always permitted.

By: Sean

Sean — Thu, 23 Oct 2008 18:13:00 +0000

The reason you need to put an @ symbol in front of a string to make it an NSString is because otherwise it will be considered a C byte array.

This will fail
NSString *str = “hello world”;

But this wont
NSString *str = [NSString stringWithUTF8String:"hello world"];

Just remember that Objective-C development is actually a mixture of Obj-C and regular C

By: John

John — Thu, 23 Oct 2008 01:29:32 +0000

Nice Job Josh!
You’ve summed up many of the ‘gotchas’ perfectly.
I’m sure you’ll help solve a lot of headaches for readers with this!