December 2010
Beginner to intermediate
320 pages
10h 3m
English
Content preview from Learning the iOS 4 SDK for JavaScript ProgrammersBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Warning Messages
- Warning Message: '<className>' may not respond to '<methodName>'
Interpretation: A message receiver is a class that does not have the named method defined for it. The method name in your message may be spelled or capitalized incorrectly. Alternatively, the receiver may belong to a different class than you think it is in.
- Warning Message: Cannot find interface declaration for '<className>'
Interpretation: The implementation file does not include an
#importdirective for the header file.- Warning Message: Control reaches end of non-void function
Interpretation: Your method is declared to return a value, but the method does not contain a
returnstatement. This commonly occurs when you insert an empty method as a placeholder in the implementation and the method is defined to return a non-void value.- Warning Message: Incompatible Objective-C types initializing ’struct NSArray *', expected ’struct NSString *'
Interpretation: A method declaration in the header states that the returned value is an
NSString, but the implementation says the returned value is anNSArray. They need to be the same type.- Warning Message: Incompatible Objective-C types returning ’struct NSString *', expected ’struct NSArray *'
Interpretation: A method is defined to return an
NSArray, but the returned value is defined as anNSStringtype.- Warning Message: Incomplete implementation of class '<className>'
Interpretation: The compiler can’t match all declarations in the header with corresponding implementations. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.