diff options
| -rw-r--r-- | objective-c.html.markdown | 35 |
1 files changed, 23 insertions, 12 deletions
diff --git a/objective-c.html.markdown b/objective-c.html.markdown index bbdbac4c..419c0475 100644 --- a/objective-c.html.markdown +++ b/objective-c.html.markdown @@ -74,7 +74,7 @@ int main (int argc, const char * argv[]) short fortyTwoShort = [fortyTwoShortNumber shortValue]; // or 42 NSLog(@"%hi", fortyTwoShort); - NSNumber *fortyTwoShortNumber = [NSNumber numberWithShort:41]; + NSNumber *fortyTwoShortNumber = [NSNumber numberWithShort:41]; unsigned short fortyTwoUnsigned = [fortyTwoShortNumber unsignedShortValue]; // or 41 NSLog(@"%hu", fortyTwoUnsigned); @@ -82,7 +82,7 @@ int main (int argc, const char * argv[]) long fortyTwoLong = [fortyTwoLongNumber longValue]; // or 42 NSLog(@"%li", fortyTwoLong); - NSNumber *fortyTwoLongNumber = @53L; + NSNumber *fortyTwoLongNumber = @53L; unsigned long fiftyThreeUnsigned = [fortyTwoLongNumber unsignedLongValue]; // or 53 NSLog(@"%lu", fiftyThreeUnsigned); @@ -93,7 +93,7 @@ int main (int argc, const char * argv[]) NSLog(@"%5.2f", piFloat); // prints => " 3.14" NSNumber *piDoubleNumber = @3.1415926535; - double piDouble = [piDoubleNumber doubleValue]; // or 3.1415926535 + double piDouble = [piDoubleNumber doubleValue]; // or 3.1415926535 NSLog(@"%f", piDouble); NSLog(@"%4.2f", piDouble); // prints => "3.14" @@ -112,7 +112,7 @@ int main (int argc, const char * argv[]) NSNumber *noNumber = @NO; // or BOOL yesBool = YES; - BOOL noBool = NO; + BOOL noBool = NO; NSLog(@"%i", yesBool); // prints => 1 // Array object @@ -144,6 +144,7 @@ int main (int argc, const char * argv[]) NSMutableSet *mutableSet = [NSMutableSet setWithCapacity:2]; [mutableSet addObject:@"Hello"]; [mutableSet addObject:@"Hello"]; + NSLog(@"%@", mutableSet); // prints => {(Hello)} /////////////////////////////////////// // Operators @@ -281,11 +282,12 @@ int main (int argc, const char * argv[]) // @end @interface MyClass : NSObject <MyProtocol> { - int count; - id data; - NSString *name; + // 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) + NSString *name; } -// Convenience notation to auto generate public getter and setter +// 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. @@ -294,8 +296,16 @@ _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: -[objInitVar setCount:10]; // objInitVar = random object instance @property resides in. -NSLog(@"%@", [objInitVar count]); // prints => 10 +MyClass *myClass = [[MyClass alloc] init]; // create MyClass object instance. +[myClass setCount:10]; +NSLog(@"%@", [myClass count]); // prints => 10 +// 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 // Methods +/- (return type)methodSignature:(Parameter Type *)parameterName; @@ -310,8 +320,9 @@ NSLog(@"%@", [objInitVar count]); // prints => 10 @end // Implement the methods in an implementation (MyClass.m) file: - -@implementation MyClass +@implementation MyClass { + long count; // Private access instance variable. +} // Call when the object is releasing - (void)dealloc |