diff options
Diffstat (limited to 'objective-c.html.markdown')
| -rw-r--r-- | objective-c.html.markdown | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/objective-c.html.markdown b/objective-c.html.markdown index 772e72ca..56640a87 100644 --- a/objective-c.html.markdown +++ b/objective-c.html.markdown @@ -12,7 +12,7 @@ filename: LearnObjectiveC.m Objective-C is the main programming language used by Apple for the OS X and iOS operating systems and their respective frameworks, Cocoa and Cocoa Touch. It is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. -```cpp +```objective_c // Single-line comments start with // /* @@ -55,7 +55,7 @@ int main (int argc, const char * argv[]) id myObject2 = nil; // Weak typing // %@ is an object // 'description' is a convention to display the value of the Objects - NSLog(@"%@ and %@", myObject1, [myObject2 description]); // Print "(null) and (null)" + NSLog(@"%@ and %@", myObject1, [myObject2 description]); // prints => "(null) and (null)" // String NSString *worldString = @"World"; @@ -128,9 +128,10 @@ int main (int argc, const char * argv[]) // May contain different data types, but must be an Objective-C object NSArray *anArray = @[@1, @2, @3, @4]; NSNumber *thirdNumber = anArray[2]; - NSLog(@"Third number = %@", thirdNumber); // Print "Third number = 3" - // NSMutableArray is mutable version of NSArray allowing to change items in array - // and extend or shrink array object. Convenient, but not as efficient as NSArray + NSLog(@"Third number = %@", thirdNumber); // prints => "Third number = 3" + // NSMutableArray is a mutable version of NSArray, allowing you to change + // the items in the array and to extend or shrink the array object. + // Convenient, but not as efficient as NSArray. NSMutableArray *mutableArray = [NSMutableArray arrayWithCapacity:2]; [mutableArray addObject:@"Hello"]; [mutableArray addObject:@"World"]; @@ -140,7 +141,7 @@ int main (int argc, const char * argv[]) // Dictionary object NSDictionary *aDictionary = @{ @"key1" : @"value1", @"key2" : @"value2" }; NSObject *valueObject = aDictionary[@"A Key"]; - NSLog(@"Object = %@", valueObject); // Print "Object = (null)" + NSLog(@"Object = %@", valueObject); // prints => "Object = (null)" // NSMutableDictionary also available as a mutable dictionary object NSMutableDictionary *mutableDictionary = [NSMutableDictionary dictionaryWithCapacity:2]; [mutableDictionary setObject:@"value1" forKey:@"key1"]; @@ -210,7 +211,7 @@ int main (int argc, const char * argv[]) while (ii < 4) { NSLog(@"%d,", ii++); // ii++ increments ii in-place, after using its value - } // => prints "0," + } // prints => "0," // "1," // "2," // "3," @@ -220,7 +221,7 @@ int main (int argc, const char * argv[]) for (jj=0; jj < 4; jj++) { NSLog(@"%d,", jj); - } // => prints "0," + } // prints => "0," // "1," // "2," // "3," @@ -230,7 +231,7 @@ int main (int argc, const char * argv[]) for (NSNumber *value in values) { NSLog(@"%@,", value); - } // => prints "0," + } // prints => "0," // "1," // "2," // "3," @@ -238,7 +239,7 @@ int main (int argc, const char * argv[]) // Object for loop statement. Can be used with any Objective-C object type for (id item in values) { NSLog(@"%@,", item); - } // => prints "0," + } // prints => "0," // "1," // "2," // "3," @@ -255,7 +256,7 @@ int main (int argc, const char * argv[]) } @finally { NSLog(@"Finally. Time to clean up."); - } // => prints "Exception: File Not Found on System" + } // prints => "Exception: File Not Found on System" // "Finally. Time to clean up." // NSError objects are useful for function arguments to populate on user mistakes. @@ -627,7 +628,7 @@ int main (int argc, const char * argv[]) { @end // Instances of Car now have access to the protocol. Car *carInstance = [[Car alloc] init]; -[[carInstance setEngineOn:NO]; +[carInstance setEngineOn:NO]; [carInstance turnOnEngine]; if ([carInstance engineOn]) { NSLog(@"Car engine is on."); // prints => "Car engine is on." |