Merge remote-tracking branch 'adambard/master'

1 files changed, 54 insertions, 5 deletions

diff --git a/objective-c.html.markdown b/objective-c.html.markdown
index f130ea0c..097cb846 100644
--- a/objective-c.html.markdown
+++ b/objective-c.html.markdown
@@ -1,13 +1,12 @@
 ---
-
 language: Objective-C
 contributors:
     - ["Eugene Yagrushkin", "www.about.me/yagrushkin"]
     - ["Yannick Loriot", "https://github.com/YannickL"]
     - ["Levi Bostian", "https://github.com/levibostian"]
     - ["Clayton Walker", "https://github.com/cwalk"]
+    - ["Fernando Valverde", "http://visualcosita.xyz"]
 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.
@@ -20,6 +19,10 @@ It is a general-purpose, object-oriented programming language that adds Smalltal
 Multi-line comments look like this
 */
 
+// XCode supports pragma mark directive that improve jump bar readability
+#pragma mark Navigation Functions // New tag on jump bar named 'Navigation Functions'
+#pragma mark - Navigation Functions // Same tag, now with a separator
+
 // Imports the Foundation headers with #import
 // Use <> to import global files (in general frameworks)
 // Use "" to import local files (from project)
@@ -148,13 +151,13 @@ int main (int argc, const char * argv[])
     [mutableDictionary setObject:@"value1" forKey:@"key1"];
     [mutableDictionary setObject:@"value2" forKey:@"key2"];
     [mutableDictionary removeObjectForKey:@"key1"];
-    
+
     // Change types from Mutable To Immutable
     //In general [object mutableCopy] will make the object mutable whereas [object copy] will make the object immutable
     NSMutableDictionary *aMutableDictionary = [aDictionary mutableCopy];
     NSDictionary *mutableDictionaryChanged = [mutableDictionary copy];
-    
-    
+
+
     // Set object
     NSSet *set = [NSSet setWithObjects:@"Hello", @"Hello", @"World", nil];
     NSLog(@"%@", set); // prints => {(Hello, World)} (may be in different order)
@@ -599,6 +602,52 @@ int main (int argc, const char * argv[]) {
 
 @end
 
+// Starting in Xcode 7.0, you can create Generic classes,
+// allowing you to provide greater type safety and clarity
+// without writing excessive boilerplate.
+@interface Result<__covariant A> : NSObject
+
+- (void)handleSuccess:(void(^)(A))success
+              failure:(void(^)(NSError *))failure;
+
+@property (nonatomic) A object;
+
+@end
+
+// we can now declare instances of this class like
+Result<NSNumber *> *result;
+Result<NSArray *> *result;
+
+// Each of these cases would be equivalent to rewriting Result's interface
+// and substituting the appropriate type for A
+@interface Result : NSObject
+- (void)handleSuccess:(void(^)(NSArray *))success
+              failure:(void(^)(NSError *))failure;
+@property (nonatomic) NSArray * object;
+@end
+
+@interface Result : NSObject
+- (void)handleSuccess:(void(^)(NSNumber *))success
+              failure:(void(^)(NSError *))failure;
+@property (nonatomic) NSNumber * object;
+@end
+
+// It should be obvious, however, that writing one
+//  Class to solve a problem is always preferable to writing two
+
+// Note that Clang will not accept generic types in @implementations,
+// so your @implemnation of Result would have to look like this:
+
+@implementation Result
+
+- (void)handleSuccess:(void (^)(id))success
+              failure:(void (^)(NSError *))failure {
+  // Do something
+}
+
+@end
+
+
 ///////////////////////////////////////
 // Protocols
 ///////////////////////////////////////