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authorLevi Bostian <levi.bostian@gmail.com>2014-01-08 13:03:31 -0600
committerLevi Bostian <levi.bostian@gmail.com>2014-01-08 13:03:31 -0600
commiteab35e826eb86744d98a3fc424ebca6ccf432390 (patch)
tree7cd993af7121c1cb9091397d4eaee84931740716 /objective-c.html.markdown
parenta16841e0497d033af29257233b2c3e8e93b7987f (diff)
Organize branch changes.
Diffstat (limited to 'objective-c.html.markdown')
-rw-r--r--objective-c.html.markdown42
1 files changed, 22 insertions, 20 deletions
diff --git a/objective-c.html.markdown b/objective-c.html.markdown
index 38b2cc52..f2787649 100644
--- a/objective-c.html.markdown
+++ b/objective-c.html.markdown
@@ -297,9 +297,9 @@ int main (int argc, const char * argv[])
}
// 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 propInt; // Setter method name = 'setCount'
+@property int propInt; // Setter method name = 'setPropInt'
@property (copy) id copyId; // (copy) => Copy the object during assignment.
-// (readonly) => Cannot set value outside interface.
+// (readonly) => Cannot set value outside @interface.
@property (readonly) NSString *roString; // Use @synthesize in @implementation to create accessor.
// You can customize the getter and setter names instead of using default 'set' name:
@property (getter=lengthGet, setter=lengthSet:) int length;
@@ -307,16 +307,17 @@ int main (int argc, const char * argv[])
// Methods
+/- (return type)methodSignature:(Parameter Type *)parameterName;
-// + for class method.
+// + for class methods:
+ (NSString *)classMethod;
+ (MyClass *)myClassFromHeight:(NSNumber *)defaultHeight;
-// - for instance methods.
+// - for instance methods:
- (NSString *)instanceMethodWithParameter:(NSString *)string;
- (NSNumber *)methodAParameterAsString:(NSString*)string andAParameterAsNumber:(NSNumber *)number;
// Constructor methods with arguments:
- (id)initWithDistance:(int)defaultDistance;
+// Objective-C method names are very descriptive. Always name methods according to their arguments.
@end // States the end of the interface.
@@ -333,29 +334,30 @@ NSLog(@"%i", [myClass lengthGet]); // prints => 32
myClass.count = 45;
NSLog(@"%i", myClass.count); // prints => 45
+// Call class methods:
+NSString *classMethodString = [MyClass classMethod];
+MyClass *classFromName = [MyClass myClassFromName:@"Hello"];
+
+// Call instance methods:
+MyClass *myClass = [[MyClass alloc] init]; // Create MyClass object instance.
+NSString *stringFromInstanceMethod = [myClass instanceMethodWithParameter:@"Hello"];
+
// Selectors.
-// Way of dynamically represent methods. Used to call methods of a class, pass methods
-// through functions to tell other classes they should call it, and save to methods
+// Way to dynamically represent methods. Used to call methods of a class, pass methods
+// through functions to tell other classes they should call it, and to save methods
// as a variable.
-// SEL is data type. @selector() returns a selector from method name provided.
+// SEL is the data type. @selector() returns a selector from method name provided.
// methodAParameterAsString:andAParameterAsNumber: is method name for method in MyClass
SEL selectorVar = @selector(methodAParameterAsString:andAParameterAsNumber:);
if ([myClass respondsToSelector:selectorVar]) { // Checks if class contains method.
- // Must put method arguments into one object to send to performSelector.
+ // Must put all method arguments into one object to send to performSelector function.
NSArray *arguments = [NSArray arrayWithObjects:@"Hello", @4, nil];
- [myClass performSelector:selectorVar withObject:arguments]; // Calls the method
+ [myClass performSelector:selectorVar withObject:arguments]; // Calls the method.
} else {
+ // NSStringFromSelector() returns a NSString of the method name of a given selector.
NSLog(@"MyClass does not have method: %@", NSStringFromSelector(selectedVar));
}
-// Call class methods:
-NSString *classMethodString = [MyClass classMethod];
-MyClass *classFromName = [MyClass myClassFromName:@"Hello"];
-
-// Call instance methods:
-MyClass *myClass = [[MyClass alloc] init]; // Create MyClass object instance.
-NSString *stringFromInstanceMethod = [myClass instanceMethodWithParameter:@"Hello"];
-
// Implement the methods in an implementation (MyClass.m) file:
@implementation MyClass {
long distance; // Private access instance variable.
@@ -384,13 +386,13 @@ distance = 18; // References "long distance" from MyClass implementation.
[super dealloc]; // and call parent class dealloc.
}
-// Constructors are a way of creating instances of classes.
+// Constructors are a way of creating instances of a class.
// This is a default constructor which is called when the object is initialized.
- (id)init
{
if ((self = [super init])) // 'super' used to access methods from parent class.
{
- self.count = 1; // 'self' used for object to send messages to itself.
+ self.count = 1; // 'self' used for object to call itself.
}
return self;
}
@@ -422,7 +424,7 @@ distance = 18; // References "long distance" from MyClass implementation.
return @42;
}
-// If you create a method in @implementation but do not include in @interface, it is private.
+// To create a private method, create the method in the @implementation but not in the @interface.
- (NSNumber *)secretPrivateMethod {
return @72;
}