summaryrefslogtreecommitdiffhomepage
path: root/objective-c.html.markdown
diff options
context:
space:
mode:
Diffstat (limited to 'objective-c.html.markdown')
-rw-r--r--objective-c.html.markdown61
1 files changed, 58 insertions, 3 deletions
diff --git a/objective-c.html.markdown b/objective-c.html.markdown
index cf6bf780..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)
@@ -149,6 +152,12 @@ int main (int argc, const char * argv[])
[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)
@@ -593,6 +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
///////////////////////////////////////
@@ -682,7 +737,7 @@ addUp = ^(int n) { // Remove (int n) to have a block that doesn't take in any pa
mutableVar = 32; // Assigning new value to __block variable.
return n + outsideVar; // Return statements are optional.
}
-int addUp = add(10 + 16); // Calls block code with arguments.
+int addUp = addUp(10 + 16); // Calls block code with arguments.
// Blocks are often used as arguments to functions to be called later, or for callbacks.
@implementation BlockExample : NSObject