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authorLevi Bostian <levi.bostian@gmail.com>2013-12-26 22:26:34 -0600
committerLevi Bostian <levi.bostian@gmail.com>2013-12-30 18:14:04 -0600
commit03ada8d9751993ad1b36d3d5848678b31ac9021c (patch)
treea8cda16360064f6a95f034aff6aa4040e6502f67 /objective-c.html.markdown
parentf15a2b5f782b0f5fb2de6359353f948218860484 (diff)
Add instance variable definition examples.
Diffstat (limited to 'objective-c.html.markdown')
-rw-r--r--objective-c.html.markdown35
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