Comments on: iPhone SDK Objective-C Cheat Sheet Updated

By: BrooksR

BrooksR — Sun, 13 Sep 2009 14:57:46 +0000

Very nice. Would you do one for VB developers?

By: BrooksR

BrooksR — Sun, 13 Sep 2009 07:57:46 +0000

Very nice. Would you do one for VB developers?

By: Global Variables in iPhone Objective-C | iPhone Development Tutorials and Tips

Mon, 27 Jul 2009 21:02:58 +0000

[...] you’re transitioning to Objective-C from C/C++/Java you might want to check out my Objective-C Cheat Sheet. Share and [...]

By: mxweas

mxweas — Sun, 28 Jun 2009 20:36:10 +0000

Add categories?
ie:
@interface NSString (MyCoolAddition)
- (NSString *)shuffleString;
@end

@implementation NSString (MyCoolAddition)
- (NSString *)shuffleString {
//Do some shuffling here
//Return shuffled string
}
@end

By: maniacdev

maniacdev — Sun, 28 Jun 2009 20:26:26 +0000

Thanks for everyone's comments and am going to implement as much as I can into the cheat sheet..

Keep in mind, I originally created this cheat sheet for people just transitioning from C/C++/Java to Obj-C for the first time so that they could begin to understand the code.

My plan is to create another cheat sheet with more intermediate concepts specifically to coincide with the second app that we'll be creating in my video tutorials. Before a more advanced cheat sheet prior to getting into apps using OpenGL ES.

Stay tuned, and I appreciate all the suggestions so keep them coming.

By: TomG

TomG — Sun, 28 Jun 2009 05:19:48 +0000

LOL, it doesn't matter maniac, no one is going to get confused like that.

By: TomG

TomG — Sun, 28 Jun 2009 05:16:05 +0000

Why aregue about these semantics?

The terms class method and static method are basically interchangeable, just check wikipedia, or check numerous books.

http://en.wikipedia.org/wiki/Method_(computer_s...)

Yes, class methods are dynamically dispatched, but they're just like C++ static methods as the poster said. It's just semantics that won't matter to someone who is brand new to the language and needing a cheat sheet.

By: David Maymudes

David Maymudes — Sun, 28 Jun 2009 03:25:29 +0000

That's exactly my point–I had no idea what it's called, so that would be a great thing for the cheat sheet because you can't Google “objective C plus minus” to find out what it means. I was saying that it's like a C++ static method in the sense that it doesn't operate on a specific instance of a class.

(Hey, you know what–I just assumed that that Google search wouldn't work. If you actually do the search, the first result is the Wikipedia Objective C page with an explanation of what + and – mean. Google, I will never doubt you again.)

By: Chris Hanson

Chris Hanson — Sun, 28 Jun 2009 03:19:55 +0000

A leading + doesn't indicate a static method, it indicates a class method. The difference is that class methods are dynamically dispatched just like instance methods, and can be overridden in subclasses just like instance methods.

By: David Maymudes

David Maymudes — Sun, 28 Jun 2009 02:21:56 +0000

one suggestion: how about something about using “+” instead of the leading “-” to indicate a static method… it's the kind of thing that's impossible to Google to find out, and I'm sure there are lots of people new to Objective C who are asking themselves “why does everything have a leading dash?”