diff options
Diffstat (limited to 'objective-c.html.markdown')
| -rw-r--r-- | objective-c.html.markdown | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/objective-c.html.markdown b/objective-c.html.markdown index 097cb846..2b599378 100644 --- a/objective-c.html.markdown +++ b/objective-c.html.markdown @@ -110,7 +110,7 @@ int main (int argc, const char * argv[]) NSLog(@"%f", piDouble); NSLog(@"%4.2f", piDouble); // prints => "3.14" - // NSDecimalNumber is a fixed-point class that's more precise then float or double + // NSDecimalNumber is a fixed-point class that's more precise than float or double NSDecimalNumber *oneDecNum = [NSDecimalNumber decimalNumberWithString:@"10.99"]; NSDecimalNumber *twoDecNum = [NSDecimalNumber decimalNumberWithString:@"5.002"]; // NSDecimalNumber isn't able to use standard +, -, *, / operators so it provides its own: @@ -133,6 +133,8 @@ int main (int argc, const char * argv[]) NSArray *anArray = @[@1, @2, @3, @4]; NSNumber *thirdNumber = anArray[2]; NSLog(@"Third number = %@", thirdNumber); // prints => "Third number = 3" + // Since Xcode 7, NSArray objects can be typed (Generics) + NSArray<NSString *> *stringArray = @[@"hello", @"world"]; // 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. @@ -146,6 +148,8 @@ int main (int argc, const char * argv[]) NSDictionary *aDictionary = @{ @"key1" : @"value1", @"key2" : @"value2" }; NSObject *valueObject = aDictionary[@"A Key"]; NSLog(@"Object = %@", valueObject); // prints => "Object = (null)" + // Since Xcode 7, NSDictionary objects can be typed (Generics) + NSDictionary<NSString *, NSNumber *> *numberDictionary = @{@"a": @1, @"b": @2}; // NSMutableDictionary also available as a mutable dictionary object NSMutableDictionary *mutableDictionary = [NSMutableDictionary dictionaryWithCapacity:2]; [mutableDictionary setObject:@"value1" forKey:@"key1"]; @@ -161,6 +165,8 @@ int main (int argc, const char * argv[]) // Set object NSSet *set = [NSSet setWithObjects:@"Hello", @"Hello", @"World", nil]; NSLog(@"%@", set); // prints => {(Hello, World)} (may be in different order) + // Since Xcode 7, NSSet objects can be typed (Generics) + NSSet<NSString *> *stringSet = [NSSet setWithObjects:@"hello", @"world", nil]; // NSMutableSet also available as a mutable set object NSMutableSet *mutableSet = [NSMutableSet setWithCapacity:2]; [mutableSet addObject:@"Hello"]; @@ -700,7 +706,7 @@ if ([myClass conformsToProtocol:@protocol(CarUtilities)]) { // NOTE: If two or more protocols rely on each other, make sure to forward-declare them: #import "Brother.h" -@protocol Brother; // Forward-declare statement. Without it, compiler would through error. +@protocol Brother; // Forward-declare statement. Without it, compiler will throw error. @protocol Sister <NSObject> |