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8 Addresses And Pointers

At a glance: Notes

1. 1. 8AddressesAndPointers-ObjectiveC
2. 2. To understand the way pointers operate, you first must understand the concept of indirection.
3. 3. This unary operator, known as the address operator, makes a pointer to a variable in Objective-C.
4. 4. Addresses
5. 5. console output Addresses
6. 6. In a computer, everything is stored in memory, and thus everything has an address.
7. 7. Console output
8. 8. Getting addresses.
9. 9. Use the * operator on the left-hand side of an assignment to store data at a particular address:
10. 10. Storing addresses in pointers.
11. 11. Getting the data at an address.
12. 12. How many bytes does this data type occupy ?
13. 13. NULL
14. 14. another example
15. 15. Stylish pointer declarations.
16. 16. A function is not able to change the actual parameters value.

9 Pass By Reference

At a glance: Notes

1. 1. 9PassByReference-ObjectiveC
2. 2. Writing pass-by-reference functions
3. 3. Avoid dereferencing NULL

10 Structs

At a glance: Notes

1. 1. A typedef defines an alias for a type declaration and allow us to use it more like the usual data types.
2. 2. Now pass a Person structure to another function.

11 The Heap

At a glance: Notes

1. 1. 11TheHeap
2. 2. So far, your programs have only used memory that has been in frames on the stack.
3. 3. Programmers often use the word buffer to mean a long line of bytes of memory.
4. 4. You claim a buffer of memory using the function malloc().
5. 5. When you’re done using the buffer, you call the function free()
6. 6. We need a chunk of memory big enough to hold 1,000 floats.
7. 7. You can also use malloc() to claim space for a struct on the heap.
8. 8. Notice the operator ->

12 Objects

At a glance: Notes

1. 1. Creating and using your first object
2. 2. Message anatomy
3. 3. Objects in memory
4. 4. id
5. 5. Challenge

13 More Messages

At a glance: Notes

1. 1. Nesting message sends
2. 2. Multiple arguments
3. 3. Sending messages to nil
4. 4. Challenge

14 NSString

At a glance: Notes

1. 1. Challenge

15 NSArray

At a glance: Notes

1. 1. NSArray
2. 2. NSMutableArray
3. 3. Challenge

17 Your First Class

At a glance: Notes

1. 1. Your First Class
2. 2. Accessor methods
3. 3. Dot notation
4. 4. Properties
5. 5. self
6. 6. Multiple files
7. 7. Challenge

18 Inheretance

At a glance: Notes

1. 1. Overriding Methods
2. 2. super
3. 3. Challenge

19 Object Instance Variables

At a glance: Notes

1. 1. Object Ownership and ARC
2. 2. Creating the Asset Class

20 Preventing Memory Leaks

At a glance: Notes

1. 1. Retain Cycles
2. 2. Weak References
3. 3. Zeroing of Weak references
4. 4. Manual Reference Counting and ARC History
5. 5. New basic example of Retain Cycles
6. 6. Retain count rules

21 Collection Classes

At a glance: Notes

1. 1. NSArray / NSMutableArray
2. 2. Immutable objects
3. 3. Sorting
4. 4. Filtering
5. 5. NSSet/NSMutableSet
6. 6. NSDictionary/NSMutableDictionary
7. 7. C primitive types
8. 8. Collections and nil

22 Constants

At a glance: Notes

1. 1. Preprocessor directives
2. 2. #include and #import
3. 3. #define
4. 4. Global Variables
5. 5. enum
6. 6. #define vs global variables

23 Writing Files With NSString And NSData

At a glance: Notes

1. 1. Writing an NSString to a file
2. 2. NSError
3. 3. Reading files with NSString
4. 4. Writing an NSData object to a file
5. 5. Reading an NSData from a file

24 Callbacks

At a glance: Notes

1. 1. Target-Action
2. 2. Helper Objects
3. 3. Notifications
4. 4. Which to use
5. 5. Callbacks and object ownership

25 Protocols

At a glance: Notes

1. 1. 25Protocols-ObjectiveC
2. 2. It is importan to remember that who you are is different from what you do
3. 3. The class of an object is different from its role in a working system.
4. 4. We’ve talked about how to specify a class. Is it possible to specify a role?
5. 5. How did the developer who created the UITableView class specify the role of UITableView’s data source? He created a protocol.
6. 6. A protocol is a list of method declarations.
7. 7. The data source protocol for UITableView is named UITableViewDataSource
8. 8. Do you remember an instance of Logger the delegate of an NSURLConnection object ?

26 Property List

At a glance: Notes

1. 1. Challenge

27 Your first iOS Application

I created a basic app by code (XIB files or storyboards are not used)

At a glance: Notes

1. 1. 27YourFirstiOSApplication
2. 2. The run loop waits for events
3. 3. Model View Controller
4. 4. The UIApplication Object
5. 5. The application delegate
6. 6. Watch out about this after continue with the project
7. 7. AppDelegate.h
8. 8. AppDelegate.m
9. 9. pragma mark - Application Delegate callbacks
10. 10. iOS Documentation: Responding to Notifications and Events
11. 11. Setting up the Views
12. 12. Running on the iOS Simulator
13. 13. Adding new tasks
14. 14. Saving task data
15. 15. What is the first responder bussines ?
16. 16. Fix object sizes
17. 17. When you tap a cell, hide keyboard
18. 18. Disable insert button when taskTextField is empty and present an alert momentary

28 Your First Cocoa Application

At a glance: Notes

1. 1. Edit BNRDocument.h
2. 2. A look at Interface Builder
3. 3. Edit BNRDocument.xib
4. 4. Setting the autosizing mask
5. 5. Making connections
6. 6. Revisiting MVC
7. 7. Edit BNRDocument.m
8. 8. Challenges

29 init

At a glance: Notes

1. 1. Writing init methods
2. 2. A basic init method
3. 3. Using accessors
4. 4. init methods that take arguments
5. 5. Deadly init methods

30 Properties

At a glance: Notes

1. 1. Property attributes
2. 2. Mutability
3. 3. Lifetime specifiers
4. 4. copy
5. 5. More about copying
6. 6. Advice on atomic vs. nonatomic
7. 7. Key-value coding
8. 8. Non object types

31. Categories - Objective C

32 Blocks

At a glance: Notes

1. 1. Blocks
2. 2. Defining blocks
3. 3. Using blocks
4. 4. Declaring a block variable
5. 5. Assigning a block
6. 6. Passing in a block
7. 7. typedef
8. 8. Return values
9. 9. Memory management
10. 10. The block-based future
11. 11. Challenges - Anonymous block
12. 12. NSNotificationCenter
13. 13. Retain Cycles and Blocks

34 C Strings

At a glance: Notes

1. 1. char
2. 2. char *
3. 3. String literals
4. 4. Converting to and from NSString
5. 5. Challenge