diff options
| -rw-r--r-- | objective-c.html.markdown | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/objective-c.html.markdown b/objective-c.html.markdown index 0131a34c..95012152 100644 --- a/objective-c.html.markdown +++ b/objective-c.html.markdown @@ -50,9 +50,8 @@ int main (int argc, const char * argv[]) // String NSString *worldString = @"World"; - NSLog(@"Hello %@!", worldString); // prints => "Hello World!" - // The mutable version of NSString is NSMutableString that allows to edit - // individual characters or append strings together. + NSLog(@"Hello %@!", worldString); // prints => "Hello World!" + // NSMutableString is a mutable version of the NSString object. NSMutableString *mutableString = [NSMutableString stringWithString:@"Hello"]; [mutableString appendString:@" World!"]; NSLog(@"%@", mutableString); // prints => "Hello World!" @@ -98,11 +97,11 @@ int main (int argc, const char * argv[]) NSLog(@"%f", piDouble); NSLog(@"%4.2f", piDouble); // prints => "3.14" - // NSDecimalNumber is Objective-C's fixed-point class more precise then float or double + // NSDecimalNumber is a fixed-point class that's more precise then float or double NSDecimalNumber *oneDecNum = [NSDecimalNumber decimalNumberWithString:@"10.99"]; NSDecimalNumber *twoDecNum = [NSDecimalNumber decimalNumberWithString:@"5.002"]; - // NSDecimal isn't able to use standard +, -, *, / operators. NSDecimalNumber has its own: - [oneDecNum decimalNumberByAdding:twoDecNum]; // add + // NSDecimalNumber isn't able to use standard +, -, *, / operators so it provides its own: + [oneDecNum decimalNumberByAdding:twoDecNum]; [oneDecNum decimalNumberBySubtracting:twoDecNum]; [oneDecNum decimalNumberByMultiplyingBy:twoDecNum]; [oneDecNum decimalNumberByDividingBy:twoDecNum]; @@ -132,10 +131,12 @@ int main (int argc, const char * argv[]) NSDictionary *aDictionary = @{ @"key1" : @"value1", @"key2" : @"value2" }; NSObject *valueObject = aDictionary[@"A Key"]; NSLog(@"Object = %@", valueObject); // Print "Object = (null)" + // NSMutableDictionary also available as mutable dictionary object. // Set object NSSet *set = [NSSet setWithObjects:@"Hello", @"Hello", @"World", nil]; - NSLog(@"%@", set); // prints => {(Hello, World)} + NSLog(@"%@", set); // prints => {(Hello, World)} (may be in different order) + // NSMutableSet also available as mutable set object. /////////////////////////////////////// // Operators @@ -216,6 +217,14 @@ int main (int argc, const char * argv[]) // "2," // "3," + // Object for loop statement. Can be used with any Objective-C object type. + for (id item in values) { + NSLog(@"%@,", item); + } // => prints "0," + // "1," + // "2," + // "3," + // Try-Catch-Finally statements @try { @@ -278,7 +287,7 @@ _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 = variable of object instance @property resides in. +[objInitVar setCount:10]; // objInitVar = random object instance @property resides in. NSLog(@"%@", [objInitVar count]); // prints => 10 // Methods |