diff options
| -rw-r--r-- | objective-c.html.markdown | 68 |
1 files changed, 39 insertions, 29 deletions
diff --git a/objective-c.html.markdown b/objective-c.html.markdown index b9460127..4ba1e5d5 100644 --- a/objective-c.html.markdown +++ b/objective-c.html.markdown @@ -281,41 +281,30 @@ int main (int argc, const char * argv[]) // Classes And Functions /////////////////////////////////////// -// Declare your class in a header(MyClass.h) file: -// Class Declaration Syntax: +// Declare your class in a header file (MyClass.h): +// Class declaration syntax: // @interface ClassName : ParentClassName <ImplementedProtocols> // { -// Member variable declarations; +// type name; <= variable declarations; // } -// -/+ (type) Method declarations; +// @property type name; <= property declarations. +// -/+ (type) Method declarations; <= Method declarations. // @end -@interface MyClass : NSObject <MyProtocol> +@interface MyClass : NSObject <MyProtocol> // NSObject is Objective-C base object class. { - // Instance variable declarations (can exist in either interface or implementation file) + // Instance variable declarations (can exist in either interface or implementation file). int count; // Protected access by default. - @private id data; // Private access. (More convenient to declare in implementation file) + @private id data; // Private access. (More convenient to declare in implementation file). NSString *name; } -// Convenient notation to auto generate public access getter and setter -@property int count; -@property (copy) NSString *name; // Copy the object during assignment. -@property (readonly) id data; // Declare only a getter method. -// To access public variable in implementation file, use '_' followed by variable name: -_count = 5; -NSLog(@"%d", _count); // prints => 5 -// To access public variable outside implementation file, @property generates setter method -// automatically. Method name is 'set' followed by @property variable name: -MyClass *myClass = [[MyClass alloc] init]; // create MyClass object instance. -[myClass setCount:10]; -NSLog(@"%@", [myClass count]); // prints => 10 +// Convenient notation for public access variables to auto generate a setter method. +// By default, setter method name is 'set' followed by @property variable name. +@property int count; // Setter name = 'setCount' +@property (copy) NSString *name; // (copy) => Copy the object during assignment. +@property (readonly) id data; // (readonly) => Declare only a getter method. // You can customize the getter and setter names instead of using default 'set' name: -@property (getter=countGet, setter=countSet:) int count; -[myClass countSet:32]; -NSLog(@"%i", [myClass countGet]); // prints => 32 -// For convenience, you may use dot notation to set object instance variables: -myClass.count = 45; -NSLog(@"%i", myClass.count); // prints => 45 - +@property (getter=lengthGet, setter=lengthSet:) int length; + // Methods +/- (return type)methodSignature:(Parameter Type *)parameterName; @@ -326,13 +315,34 @@ NSLog(@"%i", myClass.count); // prints => 45 - (NSString *)instanceMethodWithParameter:(NSString *)string; - (NSNumber *)methodAParameterAsString:(NSString*)string andAParameterAsNumber:(NSNumber *)number; -@end +@end // States the end of the interface. + + +// To access public variables from the implementation file, @property generates a setter method +// automatically. Method name is 'set' followed by @property variable name: +MyClass *myClass = [[MyClass alloc] init]; // create MyClass object instance. +[myClass setCount:10]; +NSLog(@"%@", [myClass count]); // prints => 10 +// Or using the custom getter and setter method defined in @interface: +[myClass lengthSet:32]; +NSLog(@"%i", [myClass lengthGet]); // prints => 32 +// For convenience, you may use dot notation to set and access object instance variables: +myClass.count = 45; +NSLog(@"%i", myClass.count); // prints => 45 + // Implement the methods in an implementation (MyClass.m) file: @implementation MyClass { - long count; // Private access instance variable. + long distance; // Private access instance variable. } +// To access public variable from the interface file, use '_' followed by variable name: +_count = 5; // References "int count" from MyClass interface. +NSLog(@"%d", _count); // prints => 5 +// Access variables defined in implementation file: +distance = 18; // References "long distance" from MyClass implementation. +NSLog(@"%li", distance); // prints => 18 + // Call when the object is releasing - (void)dealloc { @@ -370,7 +380,7 @@ NSLog(@"%i", myClass.count); // prints => 45 // statements } -@end +@end // States the end of the implementation. /* * A protocol declares methods that can be implemented by any class. |