Initial commit of code from the book

chapter_1/item_1.txt

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+// Item 1

chapter_1/item_2.txt

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+// Item 2
+
+// Simple EOCPerson class
+// EOCPerson.h
+#import <Foundation/Foundation.h>
+
+@interface EOCPerson : NSObject
+@property (nonatomic, copy) NSString *firstName;
+@property (nonatomic, copy) NSString *lastName;
+@end
+
+// EOCPerson.m
+#import "EOCPerson.h"
+
+@implementation EOCPerson
+// Implementation of methods
+@end
+
+
+// Requiring an import
+// EOCPerson.h
+#import <Foundation/Foundation.h>
+
+@interface EOCPerson : NSObject
+@property (nonatomic, copy) NSString *firstName;
+@property (nonatomic, copy) NSString *lastName;
+@property (nonatomic, strong) EOCEmployer *employer;
+@end
+
+
+// Forward declaring
+// EOCPerson.h
+#import <Foundation/Foundation.h>
+
+@class EOCEmployer;
+
+@interface EOCPerson : NSObject
+@property (nonatomic, copy) NSString *firstName;
+@property (nonatomic, copy) NSString *lastName;
+@property (nonatomic, strong) EOCEmployer *employer;
+@end
+
+// EOCPerson.m
+#import "EOCPerson.h"
+#import "EOCEmployer.h"
+
+@implementation EOCPerson
+// Implementation of methods
+@end
+
+
+// Importing a header with a protocol in it
+// EOCRectangle.h
+#import "EOCShape.h"
+#import "EOCDrawable.h"
+
+@interface EOCRectangle : EOCShape <EOCDrawable>
+@property (nonatomic, assign) float width;
+@property (nonatomic, assign) float height;
+@end

chapter_1/item_3.txt

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+// Item 3
+
+NSString *someString = @"Effective Objective-C 2.0";
+
+NSNumber *someNumber = [NSNumber numberWithInt:1];
+NSNumber *someNumber = @1;
+
+NSNumber *intNumber = @1;
+NSNumber *floatNumber = @2.5f;
+NSNumber *doubleNumber = @3.14159;
+NSNumber *boolNumber = @YES;
+NSNumber *charNumber = @‘a’;
+
+int x = 5;
+float y = 6.32f;
+NSNumber *expressionNumber = @(x * y);
+
+NSArray *animals = [NSArray arrayWithObjects:@"cat", @"dog", @"mouse", @"badger", nil];
+NSArray *animals = @[@"cat", @"dog", @"mouse", @"badger"];
+
+NSString *dog = [animals objectAtIndex:1];
+NSString *dog = animals[1];
+
+id object1 = /* … /*;
+id object2 = /* … /*;
+id object3 = /* … /*;
+
+NSArray *arrayA = [NSArray arrayWithObjects:object1, object2, object3, nil];
+NSArray *arrayB = @[object1, object2, object3];
+
+NSDictionary *personData = 
+    [NSDictionary dictionaryWithObjectsAndKeys:
+        @"Matt", @"firstName", 
+        @"Galloway", @"lastName", 
+        [NSNumber numberWithInt:28], @"age", 
+        nil];
+NSDictionary *personData = 
+    @{@"firstName" : @"Matt", 
+      @"lastName" : @"Galloway", 
+      @"age" : @28};
+
+NSString *lastName = [personData objectForKey:@"lastName"];
+NSString *lastName = personData[@"lastName"];
+
+[mutableArray replaceObjectAtIndex:1 withObject:@"dog"];
+[mutableDictionary setObject:@"Galloway" forKey:@"lastName"];
+mutableArray[1] = @"dog";
+mutableDictionary[@"lastName"] = @"Galloway";
+
+NSMutableArray *mutable = [@[@1, @2, @3, @4, @5] mutableCopy];

chapter_1/item_4.txt

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+// Item 4
+
+// EOCAnimatedView.h
+#import <UIKit/UIKit.h>
+
+@interface EOCAnimatedView : UIView
+- (void)animate;
+@end
+
+// EOCAnimatedView.m
+#import "EOCAnimatedView.h"
+
+static const NSTimeInterval kAnimationDuration = 0.3;
+
+@implementation EOCAnimatedView
+- (void)animate {
+    [UIView animateWithDuration:kAnimationDuration
+                     animations:^(){
+                         // Perform animations
+                     }];
+}
+@end
+
+
+// In the header file
+extern NSString *const StringConstant;
+
+// In the implementation file
+NSString *const StringConstant = @"VALUE";
+
+
+// EOCLoginManager.h
+#import <Foundation/Foundation.h>
+
+extern NSString *const EOCLoginManagerDidLoginNotification;
+
+@interface EOCLoginManager : NSObject
+- (void)login;
+@end
+
+// EOCLoginManager.m
+#import "EOCLoginManager.h"
+
+NSString *const EOCLoginManagerDidLoginNotification = @"EOCLoginManagerDidLoginNotification";
+
+@implementation EOCLoginManager
+
+- (void)login {
+    // Perform login asynchronously, then call `p_didLogin`.
+}
+
+- (void)p_didLogin {
+    [[NSNotificationCenter defaultCenter] 
+      postNotificationName:EOCLoginManagerDidLoginNotification
+                    object:nil];
+}
+
+@end
+
+
+// EOCAnimatedView.h
+extern const NSTimeInterval EOCAnimatedViewAnimationDuration;
+
+// EOCAnimatedView.m
+const NSTimeInterval EOCAnimatedViewAnimationDuration = 0.3;

chapter_1/item_5.txt

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+// Item 5
+
+enum EOCConnectionState {
+    EOCConnectionStateDisconnected,
+    EOCConnectionStateConnecting,
+    EOCConnectionStateConnected,
+};
+
+enum EOCConnectionState state = EOCConnectionStateNotConnected;
+
+enum EOCConnectionState {
+    EOCConnectionStateDisconnected,
+    EOCConnectionStateConnecting,
+    EOCConnectionStateConnected,
+};
+typedef enum EOCConnectionState EOCConnectionState;
+
+EOCConnectionState state = EOCConnectionStateNotConnected;
+
+enum EOCConnectionStateConnectionState : NSInteger { … };
+
+enum EOCConnectionStateConnectionState : NSInteger;
+
+enum EOCConnectionStateConnectionState {
+    EOCConnectionStateDisconnected = 1,
+    EOCConnectionStateConnecting,
+    EOCConnectionStateConnected,
+};
+
+enum EOCMethodOptions {
+    EOCMethodOptionOne   = 1 << 0,
+    EOCMethodOptionTwo   = 1 << 1,
+    EOCMethodOptionThree = 1 << 2,
+};
+
+enum EOCMethodOptions options = EOCMethodOptionOne | EOCMethodOptionThree;
+if (options & OptionOne) {
+    // OptionOne is set
+}
+
+typedef NS_ENUM(NSUInteger, EOCConnectionState) {
+    EOCConnectionStateDisconnected,
+    EOCConnectionStateConnecting,
+    EOCConnectionStateConnected,
+};
+typedef NS_OPTIONS(NSUInteger, EOCMethodOptions) {
+    EOCMethodOptionOne = 1 << 0,
+    EOCMethodOptionTwo = 1 << 1,
+    EOCMethodOptionThree = 1 << 2,
+};
+
+typedef enum EOCConnectionState : NSUInteger EOCConnectionState;
+enum EOCConnectionState : NSUInteger {
+    EOCConnectionStateDisconnected,
+    EOCConnectionStateConnecting,
+    EOCConnectionStateConnected,
+};
+
+typedef enum EOCMethodOptions : int EOCMethodOptions;
+enum EOCMethodOptions : int {
+    EOCMethodOptionOne = 1 << 0,
+    EOCMethodOptionTwo = 1 << 1,
+    EOCMethodOptionThree = 1 << 2,
+};
+
+EOCMethodOptions options = EOCMethodOptionOne | EOCMethodOptionTwo;
+
+typedef NS_ENUM(NSUInteger, EOCConnectionState) {
+    EOCConnectionStateDisconnected,
+    EOCConnectionStateConnecting,
+    EOCConnectionStateConnected,
+};
+
+// …
+
+switch (_currentState) {
+    EOCConnectionStateDisconnected:
+        // Handle disconnected state
+        break;
+    EOCConnectionStateConnecting:
+        // Handle connecting state
+        break;
+    EOCConnectionStateConnected:
+        // Handle connected state
+        break;
+}

chapter_2/item_10.txt

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+// Item 10
+
+// C early binding
+#import <stdio.h>
+
+void printHello() {
+   printf("Hello, world!\n");
+}
+void printGoodbye() {
+    printf("Goodbye, world!\n");
+} 
+
+void doTheThing(int type) {
+    if (type == 0) {
+        printHello();
+    } else {
+        printGoodbye();
+    }
+    return 0;
+}
+
+
+// C late binding
+#import <stdio.h>
+
+void printHello() {
+   printf("Hello, world!\n");
+}
+void printGoodbye() {
+    printf("Goodbye, world!\n");
+} 
+
+void doTheThing(int type) {
+    void (*fnc)();
+    if (type == 0) {
+        fnc = printHello;
+    } else {
+        fnc = printGoodbye;
+    }
+    fnc();
+    return 0;
+}