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diff --git a/objective-c.html.markdown b/objective-c.html.markdown new file mode 100644 index 00000000..787a9219 --- /dev/null +++ b/objective-c.html.markdown @@ -0,0 +1,99 @@ +--- +language: Objectiv-C +author: Eugene Yagrushkin +author_url: www.about.me/yagrushkin +filename: learnc.Objectiv-C +--- + +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. +It's is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. + +```Objective-C +// Single-line comments start with // + +/* +Multi-line comments look like this. +*/ + +##Basic types +// all the primitive variable types are the same as in C +// char, int, long, double, float + + +// Simple, common classes +// number +NSNumber *firstNumber = @1; +NSNumber *secondNumber = @23.0; +NSNumber *boolNumber = @YES; + +// string +NSString *aString = @"some string"; + +// array +NSArray *array = @[ @1, @2]; + +// dictionary +NSDictionay *dictionary = @{ @"aKey" : @"aValue", @"aKey2" : @"aValue2" }; + +// Import headers with #import +#import <UIKit/UIKit.h> +#import "SomeAppDelegate.h" + +##Coding classes + +// Declare your class in a header(.h) file: + +@interface UserObject : NSObject{ +// instance variables +} + +// Class method + + (NSString*) ClassMethod; + +// Instance method + - (NSString*) instanceMethodWithParmeter:(NSString*)string; + +@end + +// Add class methods in an implementation (.m) file: + +@implementation UserObject + ++ (NSString*) ClassMethod{ + return @"SomeString"; +} + +- (NSString*) instanceMethodWithParmeter:(NSString*)string; +{ + return @"New string"; +} + +- (NSString*) otherMethodWithString:(NSString*)string; +{ + return [NSString stringWithString:string]; +} +@end + +// Create an object instance by allocating memory and initializing it. An object is not fully functional until both steps have been completed. +UserObject *someObject = [[UserObject alloc] init]; + +##Calling Methods + +// The Objective-C model of object-oriented programming is based on message passing to object instances. +// In Objective-C one does not simply call a method; one sends a message. + +[someObject instanceMethodWithParmeter:@"Steve Jobs"]; + +##Nested Messages +// nested messages look like this: + +[someObject instanceMethodWithParmeter:[someObject otherMethodWithString:@"Jony Ive"]]; + +``` +## Further Reading + +[Wikipedia Objective-C](http://en.wikipedia.org/wiki/Objective-C) + +[Objectively Speaking: A Crash Course in Objective-C](http://www.raywenderlich.com/12444/objectively-speaking-a-crash-course-in-objective-c) + +[iOS For High School Students: Getting Started](http://www.raywenderlich.com/5600/ios-for-high-school-students-getting-started) |