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68 lines
1.8 KiB
Markdown
68 lines
1.8 KiB
Markdown
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---
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language: Objectiv-C
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author: Eugene Yagrushkin
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author_url: www.about.me/yagrushkin
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filename: learnc.Objectiv-C
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---
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Objective-C is the main programming language used by Apple for the OS X and iOS operating systems and their respective APIs, Cocoa and Cocoa Touch.
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It's is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language.
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```Objective-C
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// Single-line comments start with //
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/*
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Multi-line comments look like this.
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*/
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// Import headers with #import
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#import <UIKit/UIKit.h>
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#import "SomeAppDelegate.h"
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// Declare your class in a header(.h) file:
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@interface UserObject : NSObject{
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// instance variables
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}
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// Class method
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+ (NSString*) ClassMethod;
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// Instance method
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- (NSString*) instanceMethodWithParmeter:(NSString*)string;
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@end
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// Add class methods in an implementation (.m) file:
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@implementation UserObject
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+ (NSString*) ClassMethod{
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return @"SomeString";
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}
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- (NSString*) instanceMethodWithParmeter:(NSString*)string;
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{
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return [NSString stringWithString:string];
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}
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@end
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// Create an object instance by allocating memory and initializing it. An object is not fully functional until both steps have been completed.
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UserObject *someObject = [[UserObject alloc] init];
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// The Objective-C model of object-oriented programming is based on message passing to object instances.
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// In Objective-C one does not simply call a method; one sends a message.
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[someObject instanceMethodWithParmeter@"Steve Jobs"];
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```
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## Further Reading
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[Wikipedia Objective-C](http://en.wikipedia.org/wiki/Objective-C)
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[Objectively Speaking: A Crash Course in Objective-C](http://www.raywenderlich.com/12444/objectively-speaking-a-crash-course-in-objective-c)
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[iOS For High School Students: Getting Started](http://www.raywenderlich.com/5600/ios-for-high-school-students-getting-started)
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