The document provides an introduction to Objective-C and iPhone development. It discusses key aspects of Objective-C including its syntax which extends C with object-oriented capabilities. Objective-C uses class definitions with interfaces and implementations. Programs create class instances that can receive messages to call methods. Classes can inherit from superclasses and support polymorphism. The document also outlines core concepts like memory management, frameworks for iOS development and examples of Hello World programs.
Contents :
Language Concepts
How Objective C works- Basics
Data Types
NSInteger
NSNumber
Operators
Loop
Inheritance
Method Overloading
Mutable and Immutable Strings
Mutable and Immutable Arrays
File Management
Learn basics of Xcode, Objective-C syntax, Object allocation, message passing, category, core obj-c classes, how view-controllers work through some basic example apps.
Contents :
Language Concepts
How Objective C works- Basics
Data Types
NSInteger
NSNumber
Operators
Loop
Inheritance
Method Overloading
Mutable and Immutable Strings
Mutable and Immutable Arrays
File Management
Learn basics of Xcode, Objective-C syntax, Object allocation, message passing, category, core obj-c classes, how view-controllers work through some basic example apps.
JavaScript and popular programming paradigms (OOP, AOP, FP, DSL). Overview of the language to see what tools we can leverage to reduce complexity of our projects.
This part goes over language features and looks at OOP and AOP with JavaScript.
The presentation was delivered at ClubAJAX on 2/2/2010.
Blog post: http://lazutkin.com/blog/2010/feb/5/exciting-js-1/
Continued in Part II: http://www.slideshare.net/elazutkin/exciting-javascript-part-ii
Classes and Objects
Classes in C++
Declaring Objects
Access Specifiers and their Scope
Defining Member Function
Overloading Member Function
Nested class
Constructors and Destructors
Introduction
Characteristics of Constructor and Destructor
Application with Constructor
Constructor with Arguments (parameterized Constructors)
Destructors
JavaScript and popular programming paradigms (OOP, AOP, FP, DSL). Overview of the language to see what tools we can leverage to reduce complexity of our projects.
This part goes over language features and looks at OOP and AOP with JavaScript.
The presentation was delivered at ClubAJAX on 2/2/2010.
Blog post: http://lazutkin.com/blog/2010/feb/5/exciting-js-1/
Continued in Part II: http://www.slideshare.net/elazutkin/exciting-javascript-part-ii
Classes and Objects
Classes in C++
Declaring Objects
Access Specifiers and their Scope
Defining Member Function
Overloading Member Function
Nested class
Constructors and Destructors
Introduction
Characteristics of Constructor and Destructor
Application with Constructor
Constructor with Arguments (parameterized Constructors)
Destructors
iOS is a great platform to work on, and many developers have spend some time looking at the platform. This talk is aimed at programmers with prior iOS experience who want to get into iOS in more depth.
This presentation will take you from a basic level of understanding of iOS to look at advanced topics that will make you apps more polished, better designed and, ideally, more successful.
Abstract concepts are no use, so in this talk we'll take some existing successful commercial iOS applications as a case study, and see how a selection of iOS technologies and techniques combine within it.
On the way, we'll see:
* How to use Objective-C language facilities to their best advantage
* How to exploit key iOS technologies to save you time and effort
* iOS development idioms that will improve the quality of your code
* Creating "universal" iPhone/iPad/retina applications without going mad
* Successful deployment and testing strategies
Littel information about what is Apple iOS and History of iPhone and iOs.
Some of the features provided by iOS. Introduction about iOS Technology layers. and application provided by iPhones.
iOS development Crash course in how to build an native application for iPhone.
i will be start from beginning till publishing on Apple Store step by step.
this session # 1 after the intro
Look past the square braces and the damned header files and Objective-C -- the essential language of iOS development -- really isn't that different from other object-oriented languages. Classes, single-inheritance, polymorphism, implementation hiding... check, check, check, and check. So it's really not that difficult for old Java / Python / Ruby / C++ dogs to learn new tricks once they install Xcode, right?
To be a competent Obj-C programmer, not that hard.
To be a great Obj-C programmer... now that's another story.
In this session, we will look at traits that are unique to Objective-C, the tricks that bring out the expressiveness and power of the language. We'll also look at how to write idiomatic code that will be easily understood and maintained by other Objective-C developers. We'll look at how Automatic Reference Counting resembles but is really nothing like Garbage Collection, how properties put plain old instance variables to shame, how we loosely couple classes with delegates and notification, how blocks help us un-block our code by simplifying asynchronicity, and more.
AMC Squarelearning Bangalore is the best training institute for a career development. it had students from various parts of the country and even few were from West African countries.
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The claim of launching a streaming platform in minutes might be a bit of an exaggeration, but there are services that can significantly streamline the process. Here's a breakdown:
Pros of Speedy Streaming Platform Launch Services:
No coding required: These services often use drag-and-drop interfaces or pre-built templates, eliminating the need for programming knowledge.
Faster setup: Compared to building from scratch, these platforms can get you up and running much quicker.
All-in-one solutions: Many services offer features like content management systems (CMS), video players, and monetization tools, reducing the need for multiple integrations.
Things to Consider:
Limited customization: These platforms may offer less flexibility in design and functionality compared to custom-built solutions.
Scalability: As your audience grows, you might need to upgrade to a more robust platform or encounter limitations with the "quick launch" option.
Features: Carefully evaluate which features are included and if they meet your specific needs (e.g., live streaming, subscription options).
Examples of Services for Launching Streaming Platforms:
Muvi [muvi com]
Uscreen [usencreen tv]
Alternatives to Consider:
Existing Streaming platforms: Platforms like YouTube or Twitch might be suitable for basic streaming needs, though monetization options might be limited.
Custom Development: While more time-consuming, custom development offers the most control and flexibility for your platform.
Overall, launching a streaming platform in minutes might not be entirely realistic, but these services can significantly speed up the process compared to building from scratch. Carefully consider your needs and budget when choosing the best option for you.
May Marketo Masterclass, London MUG May 22 2024.pdfAdele Miller
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- These are slides of the talk given at InteNSE'23: The 1st International Workshop on Interpretability and Robustness in Neural Software Engineering, co-located with the 45th International Conference on Software Engineering, ICSE 2023, Melbourne Australia
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...Crescat
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events.
With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use.
Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements.
If you plan events, run a venue or produce festivals and you're looking for ways to make your life easier, then we have a solution for you. Try our software for free or schedule a no-obligation demo with one of our product specialists today at crescat.io
GraphSummit Paris - The art of the possible with Graph TechnologyNeo4j
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Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
Need for Speed: Removing speed bumps from your Symfony projects ⚡️Łukasz Chruściel
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In this talk, I will take you for a spin around the performance racetrack. We’ll explore common pitfalls - those hidden potholes on your application that can cause unexpected slowdowns. Learn how to spot these performance bumps early, and more importantly, how to navigate around them to keep your application running at top speed.
We will focus in particular on tuning your engine at the application level, making the right adjustments to ensure that your system responds like a well-oiled, high-performance race car.
Zoom is a comprehensive platform designed to connect individuals and teams efficiently. With its user-friendly interface and powerful features, Zoom has become a go-to solution for virtual communication and collaboration. It offers a range of tools, including virtual meetings, team chat, VoIP phone systems, online whiteboards, and AI companions, to streamline workflows and enhance productivity.
Quarkus Hidden and Forbidden ExtensionsMax Andersen
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Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
Yet, they often turn into annoying tasks riddled with frustration, hostility, unclear feedback and lack of standards. How can we improve this crucial process?
In this session we will cover:
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By the end of this presentation, you'll have the knowledge on how to organize and improve your code review proces
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We implement context-sensitive pointer/alias and dataflow analyses on Graspan. An evaluation of these analyses on large codebases such as Linux shows that their Graspan implementations scale to millions of lines of code and are much simpler than their original implementations.
These analyses were used to augment the existing checkers; these augmented checkers found 132 new NULL pointer bugs and 1308 unnecessary NULL tests in Linux 4.4.0-rc5, PostgreSQL 8.3.9, and Apache httpd 2.2.18.
- Accepted in ASPLOS ‘17, Xi’an, China.
- Featured in the tutorial, Systemized Program Analyses: A Big Data Perspective on Static Analysis Scalability, ASPLOS ‘17.
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We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
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Enterprise Resource Planning System includes various modules that reduce any business's workload. Additionally, it organizes the workflows, which drives towards enhancing productivity. Here are a detailed explanation of the ERP modules. Going through the points will help you understand how the software is changing the work dynamics.
To know more details here: https://blogs.nyggs.com/nyggs/enterprise-resource-planning-erp-system-modules/
Custom Healthcare Software for Managing Chronic Conditions and Remote Patient...Mind IT Systems
Healthcare providers often struggle with the complexities of chronic conditions and remote patient monitoring, as each patient requires personalized care and ongoing monitoring. Off-the-shelf solutions may not meet these diverse needs, leading to inefficiencies and gaps in care. It’s here, custom healthcare software offers a tailored solution, ensuring improved care and effectiveness.
2. 2
Introduction
• Objective-C is implemented as set of extensions
to the C language.
• It's designed to give C a full capability for object-oriented
programming, and to do so in a simple
and straightforward way.
• Its additions to C are few and are mostly based
on Smalltalk, one of the first object-oriented
programming languages.
3. 3
Why Objective C
• Objective-C incorporates C, you get all the benefits of C
when working within Objective-C.
• You can choose when to do something in an object-oriented
way (define a new class, for example) and when
to stick to procedural programming techniques (define a
struct and some functions instead of a class).
• Objective-C is a simple language. Its syntax is small,
unambiguous, and easy to learn
• Objective-C is the most dynamic of the object-oriented
languages based on C. Most decisions are made at run
time.
4. 4
Object-Oriented Programming
• The insight of object-oriented programming is to
combine state and behavior, data and
operations on data, in a high-level unit, an
object, and to give it language support.
• An object is a group of related functions and a
data structure that serves those functions. The
functions are known as the object's methods,
and the fields of its data structure are its
instance variables.
5. 5
The Objective-C Language
• The Objective-C language is fully
compatible with ANSI standard C
• Objective-C can also be used as an
extension to C++.
• Although C++ itself is a Object-Oriented
Language, there are difference in the
dynamic binding from Objective-C
6. 6
Objective-C Language (cont.)
• Objective-C source files have a “.m”
extension
• “.h” file is the interface file
• For example:
– main.m
– List.h (Interface of List class.)
– List.m (Implementation of List class.)
7. 7
ID
• “id” is a data type used by Objective-C to
define a pointer of an object (a pointer to
the object’s data)
• Any type of object, as long as it is an
object, we can use the id data type.
• For example, we can define an object by:
id anObject;
• nil is the reserved word for null object
8. 8
Dynamic Typing
• “id” data type has no information about the
object
• Every object carries with it an isa instance
variable that identifies the object's class,
that is, what kind of object it is.
• Objects are thus dynamically typed at run
time. Whenever it needs to, the run-time
system can find the exact class that an
object belongs to, just by asking the object
9. 9
Messages
• To get an object to do something, you
send it a message telling it to apply a
method. In Objective-C, message
expressions are enclosed in square
brackets
[receiver message]
• The receiver is an object. The message is
simply the name of a method and any
arguments that are passed to it
10. 10
Messages (cont.)
• For example, this message tells the myRect
object to perform its display method, which
causes the rectangle to display itself
[myRect display];
[myRect setOrigin:30.0 :50.0];
• The method setOrigin::, has two colons, one for
each of its arguments. The arguments are
inserted after the colons, breaking the name
apart
11. 11
Polymorphism
• Each object has define its own method but for
different class, they can have the same method
name which has totally different meaning
• The two different object can respond differently
to the same message
• Together with dynamic binding, it permits you to
write code that might apply to any number of
different kinds of objects, without having to
choose at the time you write the code what kinds
of objects they might be
12. 12
Inheritance
• Root class is NSObject
• Inheritance is cumulative.
A Square object has the
methods and instance
variables defined for
Rectangle, Shape,
Graphic, and NSObject,
as well as those defined
specifically for Square
13. 13
Inheritance (cont.)
• Instance Variables: The new object contains not only the
instance variables that were defined for its class, but
also the instance variables defined for its super class, all
the way back to the root class
• Methods: An object has access not only to the methods
that were defined for its class, but also to methods
defined for its super class
• Method Overriding: Implement a new method with the
same name as one defined in a class farther up the
hierarchy. The new method overrides the original;
instances of the new class will perform it rather than the
original
16. Address and Pointers
• Same as C
• To get address of a variable i
&i
• Pointer
int *addressofi = &I;
16
17. Conditionals and Loops
• Same as C/C++
• if / else if/ else
• for
• while
• break
• ontinue
• do-while
for(int i=0; i< 22; i++) {
NSLog(“Checking i =“%d”, i);
if(i == 12)
{ break;}
}
17
18. 18
for in loop
• Introduced in Objective-C 2.0 (“fast enumeration”)
for(Item_Type *item in Collection_of_Items) {
//do whatever with the item
Nslog(@” Looking now at %@”, item);
}
19. 19
Functions
• Same as C/C++
• return_type functionName(type v1, type v2, ….)
{ //code of function
}
Example
void showMeInfo(int age)
{
printf(“You are %d years old”, age); //or use NSLog()
}
20. 20
Global and static variables
• Same as C/C++
• Global variables defined at top of file
• For static variables use keyword static before it
static in CurrentYear = 2013;
21. Automatic Reference Counting
21
• Objective C uses ‘AUTOMATIC reference
counting' as memory management
• keeps an internal count of how many times
an Object is 'needed'.
• System makes sure that objects that are
needed are not deleted, and when an
object is not needed it is deleted.
22. 22
Defining a Class
• In Objective-C, classes are defined in two
parts:
– An interface that declares the methods and
instance variables of the class and names its
super class
– An implementation that actually defines the
class (contains the code that implements its
methods)
23. 23
The Interface
• The declaration of a class interface begins
with the compiler directive @interface and
ends with the directive @end
@interface ClassName : ItsSuperclass
{
instance variable declarations
}
method declarations
@end
24. 24
Declaration
• Instance Variables
float width;
float height;
BOOL filled;
NSColor *fillColor;
• Methods:
• names of methods that can be used by class objects,
class methods, are preceded by a plus sign
+ alloc
• methods that instances of a class can use, instance
methods, are marked with a minus sign:
- (void) display;
25. 25
Declaration (cont.)
• Importing the Interface: The interface is
usually included with the #import directive
#import "Rectangle.h"
• To reflect the fact that a class definition builds on
the definitions of inherited classes, an interface
file begins by importing the interface for its super
class
• Referring to Other Classes: If the interface
mentions classes not in this hierarchy, it must
declare them with the @class directive:
@class Rectangle, Circle;
26. 26
Creating class instances
ClassName *object = [[ClassName alloc] init];
ClassName *object = [[ClassName alloc] initWith* ];
– NSString* myString = [[NSString alloc] init];
– Nested method call. The first is the alloc method called on NSString itself.
This is a relatively low-level call which reserves memory and instantiates
an object. The second is a call to init on the new object. The init
implementation usually does basic setup, such as creating instance
variables. The details of that are unknown to you as a client of the class.
In some cases, you may use a different version of init which takes input:
ClassName *object = [ClassName method_to_create];
– NSString* myString = [NSString string];
– Some classes may define a special method that will in essence call alloc followed by
some kind of init
27. 27
Example: Hello World
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool =
[[NSAutoreleasePool alloc] init];
// insert code here...
NSLog(@"Hello, World!");
[pool drain];
return 0;
}
NSLog() is equivalent to a C printf()
Very similar to C
C programs are valid in Objective-C
28. 28
Intro to HelloWorld
• Objective-C uses a string class similar to the
std::string or Java string. It is called NSString.
• Constant NSStrings are preceded by @ for
example: @”Hello World”
• You will notice that NSLog() also outputs time
and date and various extra information.
• NSAutoreleasePool* pool =[[NSAutoreleasePool
• alloc] init]; allocates a lump of memory
• Memory must be freed with [pool drain];
29. 29
Some things to note
• No line break needed at end of NSLog
statements.
• NSString constants use C-style variables.
• Test this program to see results.
30. 30
@interface
@interface ClassName : ParentClassName
{
declare member variable here;
declare another member variable here;
}
declare method functions here;
@end
• Equivalent to C class declaration
• Goes in header (.h) file
• Functions outside curly braces
• Don’t forget the @end tag
31. 31
@implementation
#import <Foundation/Foundation.h>
#include "ComputerScience.h“
@implementation ClassName
define method function here;
define another method function here;
define yet another method function here;
@end
● Equivalent to C class function definitions
● Goes in source (.m) file
● Don't forget the @end tag
32. 32
Some things to note
• NSObject is the “root” object in Objective-C
• No direct access to instance variables so we write
some get/set “instance methods”
• Instance methods (affect internal state of class)
are preceded with a minus sign
• “Class methods” (higher level functions) are
preceded with a plus sign e.g. create new class
• Method return type in parentheses
• Semicolon before list of parameters
• Parameter type in parenthesis, followed by name
33. 33
Data Structures
• Objective-C arrays are similar to C arrays, but
you can initialize whole array in a list.
• Or just a few indices of the array. The rest are
set to 0.
• Or mix and match; the example will create an
array of size [8].
int values[3] = { 3, 4, 2 };
char letters[3] = { 'a', 'c', 'x' };
float grades[100] = {10.0,11.2,1.1};
int array[] = {[3]=11,[2]=1,[7]=0};
34. 34
Multi-dimensional Arrays
• Can be initialized by using subset notation with
braces. Note no comma after second subset.
• Subset braces are optional, the compiler will fill
in blanks where it can as with 1D arrays.
int array[2][3] = {
{ 0, 3, 4},
{ 1, 1, 1}
};
int array[2][3] = {0, 3, 4, 1, 1, 1};
35. 35
Frameworks
• UIKit.framework for developing standard iOS GUIs
(buttons etc.)
• UITextField (user-entered text that brings up the
keyboard)
• UIFont
• UIView
• UITableView
• UIImageView
• UIImage
• UIButton (a click-able button)
• UILabel (a string of text on-screen)
• UIWindow (main Window on iPhone)