Top "Objective-c" questions

This tag should be used only on questions that are about Objective-C features or depend on code in the language.

Shortcuts in Objective-C to concatenate NSStrings

Are there any shortcuts to (stringByAppendingString:) string concatenation in Objective-C, or shortcuts for working with NSString in general? For example, …

objective-c nsstring string-concatenation
How to link to apps on the app store

I am creating a free version of my iPhone game. I want to have a button inside the free version …

ios objective-c app-store
How can I make a UITextField move up when the keyboard is present - on starting to edit?

With the iOS SDK: I have a UIView with UITextFields that bring up a keyboard. I need it to be …

ios objective-c uiscrollview uitextfield uikeyboard
Apple Mach-O Linker Error when compiling for device

I've just upgraded to xcode 4.0 and I can no longer deploy to iPhone, I get a Apple Mach-O Linker Error, …

objective-c iphone xcode xcode4
How do I check if a string contains another string in Objective-C?

How can I check if a string (NSString) contains another smaller string? I was hoping for something like: NSString *string = @"…

ios objective-c string range substring
How much does it cost to develop an iPhone application?

How much can a developer charge for an iPhone app like Twitterrific? I want to know this because I need …

iphone objective-c jobs
How do I create a basic UIButton programmatically?

How can I create a basic UIButton programmatically? For example in my view controller, when executing the viewDidLoad method, three …

objective-c uibutton programmatically-created
How do I use NSTimer?

How do I use an NSTimer? Can anyone give me step by step instructions?

objective-c cocoa nstimer
What's the difference between the atomic and nonatomic attributes?

What do atomic and nonatomic mean in property declarations? @property(nonatomic, retain) UITextField *userName; @property(atomic, retain) UITextField *userName; @property(…

ios objective-c properties atomic nonatomic
How to check iOS version?

I want to check if the iOS version of the device is greater than 3.1.3 I tried things like: [[UIDevice currentDevice].…

ios objective-c