This document provides an overview of Objective-C, including its history, development, and usage. It discusses that Objective-C is an object-oriented programming language that is a superset of C, adding Smalltalk-style messaging to C. It was invented in the 1980s at ITT Corporation and later acquired by NeXT and then Apple, making it widely used for Mac and iOS development. The document covers key aspects of Objective-C like its object model, syntax, memory management, and usage of classes and protocols.
For the full video of this presentation, please visit:
https://www.embedded-vision.com/platinum-members/embedded-vision-alliance/embedded-vision-training/videos/pages/may-2019-embedded-vision-summit-google
For more information about embedded vision, please visit:
http://www.embedded-vision.com
Pete Warden, Staff Research Engineer and TensorFlow Lite development lead at Google, presents the "Using TensorFlow Lite to Deploy Deep Learning on Cortex-M Microcontrollers" tutorial at the May 2019 Embedded Vision Summit.
Is it possible to deploy deep learning models on low-cost, low-power microcontrollers? While it may be surprising, the answer is a definite “yes”! In this talk, Warden explains how the new TensorFlow Lite framework enables creating very lightweight DNN implementations suitable for execution on microcontrollers. He illustrates how this works using an example of a 20 Kbyte DNN model that performs speech wake word detection, and discusses how this generalizes to image-based use cases. Warden introduces TensorFlow Lite, and explores the key steps in implementing lightweight DNNs, including model design, data gathering, hardware platform choice, software implementation and optimization.
What is Multithreading In Python | Python Multithreading Tutorial | EdurekaEdureka!
YouTube Link: https://youtu.be/JnFfp81VbOs
** Python Certification Training: https://www.edureka.co/python **
This Edureka PPT on 'Multithreading in Python'' will help you understand the concept of threading in python. Below are the topics covered in this live PPT:
What is multitasking in Python?
Types of multitasking
What is a thread?
How to achieve multithreading in Python?
When to use multithreading?
How to create threads in Python?
Advantages of multithreading
Python Tutorial Playlist: https://goo.gl/WsBpKe
Blog Series: http://bit.ly/2sqmP4s
Follow us to never miss an update in the future.
YouTube: https://www.youtube.com/user/edurekaIN
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
Castbox: https://castbox.fm/networks/505?country=in
Python libraries presentation Contains all top 10 labraries information like numpy,tenslorflow,scikit-learn,Numpy,keras,PyToruch,LightGBM,Eli5,scipy,theano,pandas
** Python Certification Training: https://www.edureka.co/python **
This Edureka tutorial on "Python Tutorial for Beginners" (Python Blog Series: https://goo.gl/nKQJHQ) covers all the basics of Python. It includes python programming examples, so try it yourself and mention in the comments section if you have any doubts. Following are the topics included in this PPT:
Introduction to Python
Reasons to choose Python
Installing and running Python
Development Environments
Basics of Python Programming
Starting with code
Python Operators
Python Lists
Python Tuples
Python Sets
Python Dictionaries
Conditional Statements
Looping in Python
Python Functions
Python Arrays
Classes and Objects (OOP)
Conclusion
Follow us to never miss an update in the future.
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
For the full video of this presentation, please visit:
https://www.embedded-vision.com/platinum-members/embedded-vision-alliance/embedded-vision-training/videos/pages/may-2019-embedded-vision-summit-google
For more information about embedded vision, please visit:
http://www.embedded-vision.com
Pete Warden, Staff Research Engineer and TensorFlow Lite development lead at Google, presents the "Using TensorFlow Lite to Deploy Deep Learning on Cortex-M Microcontrollers" tutorial at the May 2019 Embedded Vision Summit.
Is it possible to deploy deep learning models on low-cost, low-power microcontrollers? While it may be surprising, the answer is a definite “yes”! In this talk, Warden explains how the new TensorFlow Lite framework enables creating very lightweight DNN implementations suitable for execution on microcontrollers. He illustrates how this works using an example of a 20 Kbyte DNN model that performs speech wake word detection, and discusses how this generalizes to image-based use cases. Warden introduces TensorFlow Lite, and explores the key steps in implementing lightweight DNNs, including model design, data gathering, hardware platform choice, software implementation and optimization.
What is Multithreading In Python | Python Multithreading Tutorial | EdurekaEdureka!
YouTube Link: https://youtu.be/JnFfp81VbOs
** Python Certification Training: https://www.edureka.co/python **
This Edureka PPT on 'Multithreading in Python'' will help you understand the concept of threading in python. Below are the topics covered in this live PPT:
What is multitasking in Python?
Types of multitasking
What is a thread?
How to achieve multithreading in Python?
When to use multithreading?
How to create threads in Python?
Advantages of multithreading
Python Tutorial Playlist: https://goo.gl/WsBpKe
Blog Series: http://bit.ly/2sqmP4s
Follow us to never miss an update in the future.
YouTube: https://www.youtube.com/user/edurekaIN
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
Castbox: https://castbox.fm/networks/505?country=in
Python libraries presentation Contains all top 10 labraries information like numpy,tenslorflow,scikit-learn,Numpy,keras,PyToruch,LightGBM,Eli5,scipy,theano,pandas
** Python Certification Training: https://www.edureka.co/python **
This Edureka tutorial on "Python Tutorial for Beginners" (Python Blog Series: https://goo.gl/nKQJHQ) covers all the basics of Python. It includes python programming examples, so try it yourself and mention in the comments section if you have any doubts. Following are the topics included in this PPT:
Introduction to Python
Reasons to choose Python
Installing and running Python
Development Environments
Basics of Python Programming
Starting with code
Python Operators
Python Lists
Python Tuples
Python Sets
Python Dictionaries
Conditional Statements
Looping in Python
Python Functions
Python Arrays
Classes and Objects (OOP)
Conclusion
Follow us to never miss an update in the future.
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
Intro to the Bus Pirate, What is it? How to use it?
Using the Bus Pirate to flash a BIOS rom MX25L8005
Using the Bus Pirate as a simple logic analyzer with I2C
This is the last slide of advancedC - Advanced C part 3. In the previous slides we learnt all the fundamentals that is required to learnt Advanced C. In this last slide of Advanced C you will be learning about Multilevel pointers, Command line argument, different kinds of functions, and also you will gain deep knowledge on pre processor and user defined data types. This will help you to improve your knowledge in Advanced C
Python is an interpreted, object-oriented, high-level programming language with dynamic semantics. Its high-level built in data structures, combined with dynamic typing and dynamic binding, make it very attractive for Rapid Application Development, as well as for use as a scripting or glue language to connect existing components together. Python's simple, easy to learn syntax emphasizes readability and therefore reduces the cost of program maintenance. Python supports modules and packages, which encourages program modularity and code reuse. The Python interpreter and the extensive standard library are available in source or binary form without charge for all major platforms, and can be freely distributed.
Python Foundation – A programmer's introduction to Python concepts & styleKevlin Henney
This is a two-day course in Python programming aimed at professional programmers. The course material provided here is intended to be used by teachers of the language, but individual learners might find some of this useful as well.
The course assume the students already know some Python, but that they feel a need to establish a solid understanding of the language to further develop their skills.
The course is released under Creative Commons Attribution 4.0. Its primary location (along with some sample solutions and the original PowerPoint) is at https://github.com/JonJagger/two-day-courses/tree/master/pf
OOPS concepts are one of the most important concepts in high level languages. Here in this PPT we will learn more about Object oriented approach in python programming which includes details related to classes and objects, inheritance, dat abstraction, polymorphism and many more with examples and code.
Introduction to Python programming LanguageMansiSuthar3
This presentation give basic information about the python language,its data types,operators,code blocks,functions,packages,file handling ,classes and also its syntax with examples. It also include some basic information Numpy and various plotting.
** Python Certification Training: https://www.edureka.co/python **
This Edureka PPT on File Handling with Python covers all the important aspects of using files in Python right from the introduction to what fields are, all the way till checking out the major aspects of working with files and using the code-first approach to understand them better.
Python Tutorial Playlist: https://goo.gl/WsBpKe
Blog Series: http://bit.ly/2sqmP4s
Follow us to never miss an update in the future.
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
Intro to the Bus Pirate, What is it? How to use it?
Using the Bus Pirate to flash a BIOS rom MX25L8005
Using the Bus Pirate as a simple logic analyzer with I2C
This is the last slide of advancedC - Advanced C part 3. In the previous slides we learnt all the fundamentals that is required to learnt Advanced C. In this last slide of Advanced C you will be learning about Multilevel pointers, Command line argument, different kinds of functions, and also you will gain deep knowledge on pre processor and user defined data types. This will help you to improve your knowledge in Advanced C
Python is an interpreted, object-oriented, high-level programming language with dynamic semantics. Its high-level built in data structures, combined with dynamic typing and dynamic binding, make it very attractive for Rapid Application Development, as well as for use as a scripting or glue language to connect existing components together. Python's simple, easy to learn syntax emphasizes readability and therefore reduces the cost of program maintenance. Python supports modules and packages, which encourages program modularity and code reuse. The Python interpreter and the extensive standard library are available in source or binary form without charge for all major platforms, and can be freely distributed.
Python Foundation – A programmer's introduction to Python concepts & styleKevlin Henney
This is a two-day course in Python programming aimed at professional programmers. The course material provided here is intended to be used by teachers of the language, but individual learners might find some of this useful as well.
The course assume the students already know some Python, but that they feel a need to establish a solid understanding of the language to further develop their skills.
The course is released under Creative Commons Attribution 4.0. Its primary location (along with some sample solutions and the original PowerPoint) is at https://github.com/JonJagger/two-day-courses/tree/master/pf
OOPS concepts are one of the most important concepts in high level languages. Here in this PPT we will learn more about Object oriented approach in python programming which includes details related to classes and objects, inheritance, dat abstraction, polymorphism and many more with examples and code.
Introduction to Python programming LanguageMansiSuthar3
This presentation give basic information about the python language,its data types,operators,code blocks,functions,packages,file handling ,classes and also its syntax with examples. It also include some basic information Numpy and various plotting.
** Python Certification Training: https://www.edureka.co/python **
This Edureka PPT on File Handling with Python covers all the important aspects of using files in Python right from the introduction to what fields are, all the way till checking out the major aspects of working with files and using the code-first approach to understand them better.
Python Tutorial Playlist: https://goo.gl/WsBpKe
Blog Series: http://bit.ly/2sqmP4s
Follow us to never miss an update in the future.
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
Lecture 5: Storage: Saving Data Database, Files & PreferencesAhsanul Karim
This slide is made for Shikkhok.com Android course. To get the video lectures visit: http://www.shikkhok.com/%E0%A6%95%E0%A7%8B%E0%A6%B0%E0%A7%8D%E0%A6%B8-%E0%A6%A4%E0%A6%BE%E0%A6%B2%E0%A6%BF%E0%A6%95%E0%A6%BE/android-app-development/
In this slide, i have discussed the basics of angular and how can we make a Angular app beyond the 'hello world'. i also discussed about components, typescript etc in the slide. this was created for Angular Meetup Bangladesh 2017 session. Thanks
Object oriented programming 7 first steps in oop using c++Vaibhav Khanna
Advantages of C++
Portability. C++ offers the feature of portability or platform independence which allows the user to run the same program on different operating systems or interfaces at ease. ...
Object-oriented. ...
Multi-paradigm. ...
Low-level Manipulation. ...
Memory Management. ...
Large Community Support. ...
Compatibility with C. ...
Scalability.
C# is a object oriented programming language as well as modern programming Language. It is nothing but extension of C++. Its a simple and general purpose programming language for application development.
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
5. Inventors
• Objective‐C was invented by two men, Brad
j
y
,
Cox and Tom Love.
• Both were introduced to Smalltalk at ITT in
1981
• Cox thought something like Smalltalk would
be very useful to application developers
be very useful to application developers
• Cox modified a C compiler and by 1983 he had
a working Object oriented extension to C
a working Object‐oriented extension to C
called OOPC.
6. Development
• Tom Love acquired a commercial copy of
Tom Love acquired a commercial copy of
Smalltalk‐80 while working for Schlumberger
Research
• With direct access Smalltalk, Love added more
to OOPC making the final product, Objective‐
to OOPC making the final product Objective
C.
• I 1986 they release Objective‐C through their
In 1986 h
l
Obj i C h
h h i
company “Stepstone”
7. NeXT and NeXTSTEP
NeXT and NeXTSTEP
• In 1988 Steve Jobs acquires Objective‐C
q
j
license for NeXT
• Used Objective‐C to build the NeXTSTEP
Operating System
• Objective‐C made interface design for
NeXTSTEP much easier
much easier
• NeXTSTEP was derived from BSD Unix
• In 1995 NeXT gets full rights to Objective C
In 1995 NeXT gets full rights to Objective‐C
from Stepstone
8. OPENSTEP API
OPENSTEP API
• Developed in 1993 by NeXT and Sun
p
y
• An effort to make NeXTSTEP‐like Objective‐C
implementation available to other platforms.
• In order to be OS independent
– Removed dependency on Mach Kernel
– Made low‐level data into classes
• Paved the way for Mac OS X, GNUstep
9. Apple and Mac OS X
Apple and Mac OS X
• NeXT is taken over by Apple in 1996 and put
y pp
p
Steve Jobs and his Objective‐C libraries to
work
• Redesigned Mac OS to use objective‐C similar
d
d
b
l
to that of NeXTSTEP
• Developed a collection of libraries named
Developed a collection of libraries named
“Cocoa” to aid GUI development
Release Mac OS X (ten), which was radically
• Release Mac OS X (ten) which was radically
different than OS 9, in March 2001
10. The Cocoa API
The Cocoa API
• Primarily the most frequently used frameworks
Primarily the most frequently used frameworks
nowadays.
• Developed by Apple from NeXTSTEP and OPENSTEP
p
y pp
• Has a set of predefined classes and types such as
NSnumber, NSstring, Nsdate, etc.
g
• NS stands for NeXT‐sun
j
,
• Includes a root class NSObject where words like alloc,
retain, and release come from
14. A brief introduction
A brief introduction
– Object model
Object model
– Square brackets
– Naming conventions
Naming conventions
– Importing
– Class definition and implementation
Class definition and implementation
– Exception handling
– Nil objects
Nil objects
– Memory management
15. Object Model
Object Model
• provides messaging‐style syntax that involves
provides messaging style syntax that involves
passing messages to object instances, rather
than calling methods on objects.
than calling methods on objects
16. Square Brackets and Methods
• The object model is based around the concept
The object model is based around the concept
that objects are sent messages in order to
invoke a method.
• The square brackets indicate that you are
The square brackets indicate that you are
sending a message to an object.
• Example:
[ diesel start];
[ diesel start];
17. Methods and Messaging
This declaration is preceded by a minus (-) sign, which indicates
that this is an instance method.
[myArray insertObject:anObject atIndex:0];
20. Naming Conventions
• much like other languages
much like other languages,
– using PascalCase for classes
– and camelCase for methods and properties
and camelCase for methods and properties.
21. Importing
•
Two ways of importing, just as with C/C++.
Two ways of importing just as with C/C++
–
–
•
1. Angle Bracker <>
2. Double Quote “”
The difference is that the syntax of
–
–
force the compiler’s preprocessor to look for the file in the system header directory,
Quotes syntax will look in the current directory if you haven’t specified an alternative location.
•
To look in the system header directory, use the following syntax:
•
#import <Foundation/foundation.h>
•
To look for your own header file in the current or specific directory, use the following syntax:
•
#import "myfile.h”
22. Class Definition and Implementation
Class Definition and Implementation
• As with most object‐oriented languages,
– an object is defined by its class,
– and many instances of that object may be created.
• Every class consists of
– an interface, which defines the structure of the class
– and allows its functionality to be implemented.
• Each class
Each class
– has a corresponding implementation
– that actually provides the functionality.
25. Class in Obj C
Class in Obj‐C
Engine.h
Engine h
@interface Engin
‐ (int) revs;
@end
Engine.m
@implementation Engin
‐ (int) revs (
return revs;
}
‐ (void) start {
// Start the engine at an idle speed of 900 rpm
// – NOTE This is a comment
revs=900;
900
}
@end
26. Nil Objects
Nil Objects
• Methods are
– implemented as messages being passed to objects whose
correct identity is resolved at runtime.
• a mismatch during runtime,
– either an exception will be thrown (best‐case scenario)
– or the object will silently ignore the message (worst‐case
h b
ll l l
h
(
scenario).
• Be extra careful about both
– ensuring messageobject interaction is valid
– and that good exception handling is added throughout
and that good exception handling is added throughout.
28. Memory Management
Memory Management
• A referencecounting system is used by Objective‐C.
•
• This means that
– if you keep track of your references, the runtime will automatically
reclaim any memory used by objects once the reference count returns
l i
d b bj t
th
f
t t
to zero.
• NSString* s = [[NSString alloc] init]; // Ref count is 1
NSString s [[NSString alloc] init]; // Ref count is 1
• [s retain]; // Ref count is 2 ‐ silly
• // to do this after init
• [s release]; // Ref count is back to 1
• [s release]; // Ref count is 0, object is freed
32. Method Declaration
• Two type of Method:
– Class Method
– Instance method
• A class method
– indicated by a plus (+) character.
– associated with the class type.
• An instance method
– indicated by a minus (‐) character
indicated by a minus (‐) character.
– associated with an instance object associated with the
class.
41. Creating Your First iPhone
Creating Your First iPhone Application
•
•
•
•
•
1. Create your project.
1 Create your project
2. Design your application.
3. Write code.
3
i
d
4. Build and run your app.
5. Test, measure, and tune your app.