Background Modes in iOS. If you're new here, you may want to subscribe to my RSS feed or follow me on Twitter.
Thanks for visiting! Learn how to make your app do stuff even when it is no longer active Beginning with iOS 4, you can design your apps to stay suspended in memory when users push the home button. Even though the app is in memory, its operations are paused until the user starts it again. Ios - Received Memory Warning in ARC. A Short Practical Guide to Blocks. Blocks are a powerful C-language feature that is part of Cocoa application development.
They are similar to “closures” and “lambdas” you may find in scripting and programming languages such as Ruby, Python, and Lisp. Although the syntax and storage details of blocks might at first glance seem cryptic, you’ll find that it’s actually quite easy to incorporate blocks into your projects’ code. The following discussion gives a high-level survey of the features of blocks and illustrates the typical ways in which they are used.
Refer to Blocks Programming Topics for the definitive description of blocks. Working with Blocks. An Objective-C class defines an object that combines data with related behavior.
Sometimes, it makes sense just to represent a single task or unit of behavior, rather than a collection of methods. Blocks are a language-level feature added to C, Objective-C and C++, which allow you to create distinct segments of code that can be passed around to methods or functions as if they were values. Objective-C Operators and Expressions. From Techotopia In the previous chapters we looked at using variables and constants in Objective-C and also described the different data types.
Being able to create variables is only part of the story however. The next step is to learn how to use these variables and constants in Objective-C code. The primary method for working with data is in the form of expressions. Batteries - Optimisation des performances. Lithium3141/BootLaunch. Performance Tips. At each step in the development of your app, consider the implications of your design choices on the overall performance of your app.
Power usage and memory consumption are extremely important considerations for iOS apps, and there are many other considerations as well. The following sections describe the factors you should consider throughout the development process. Reduce Your App’s Power Consumption Power consumption on mobile devices is always an issue. The power management system in iOS conserves power by shutting down any hardware features that are not currently being used. The CPUWi-Fi, Bluetooth, and baseband (EDGE, 3G) radiosThe Core Location frameworkThe accelerometersThe disk The goal of your optimizations should be to do the most work you can in the most efficient way possible.
Avoid doing work that requires polling. Start Developing iOS Apps Today: Setup. Start Developing iOS Apps Today is the perfect starting point for creating apps that run on iPad, iPhone, and iPod touch.
View this guide’s four short modules as a gentle introduction to building your first app—including the tools you need and the major concepts and best practices that will ease your path. The first three modules end with a tutorial, where you’ll implement what you’ve learned. At the end of the last tutorial, you’ll have created a simple to-do list app. After you build your first app and before you start your next endeavor, read the fourth module. It explores the technologies and frameworks you might want to adopt. Even though it takes you through every step of building a simple app, to benefit most from this guide, it helps to be acquainted with computer programming in general and with object-oriented programming in particular.
Get the Tools. About the iOS Technologies. iOS is the operating system that runs on iPad, iPhone, and iPod touch devices.
The operating system manages the device hardware and provides the technologies required to implement native apps. The operating system also ships with various system apps, such as Phone, Mail, and Safari, that provide standard system services to the user. The iOS Software Development Kit (SDK) contains the tools and interfaces needed to develop, install, run, and test native apps that appear on an iOS device’s Home screen. Native apps are built using the iOS system frameworks and Objective-C language and run directly on iOS. Unlike web apps, native apps are installed physically on a device and are therefore always available to the user, even when the device is in Airplane mode.
At a Glance. About iOS App Architecture. Apps need to work with the iOS to ensure that they deliver a great user experience.
Beyond just a good design for your app’s design and user interface, a great user experience encompasses many other factors. Users expect iOS apps to be fast and responsive while expecting the app to use as little power as possible. Apps need to support all of the latest iOS devices while still appearing as if the app was tailored for the current device. New Objective-C literal syntax for NSArray, NSDictionary - Joris Kluivers. Apple committed a new patch to the llvm project adding support for new Objective-C literalsyntax for NSArray, NSDictionary and NSNumber.
Documenting in Xcode with HeaderDoc Tutorial. Liens pour gestion mémoire. Navigation Controller app using Storyboards - Part 1/2. iOS 8 App Development Essentials. ProgrammationPlateformesMobiles, site compagnon (2014/2015) - Accueil. Powered by Programmation sur Plateforme Mobile site compagnon Bienvenue sur le site compagnon du PodCast (saison 4, en 2014/2015) de l'Unité d'Enseignement «Programmation sur plateformes mobiles» dispensé en master informatique (spécialité Systèmes et Applications Répartis) à l'Université Pierre & Marie Curie.
Vous y trouverez les éléments vous permettant: d'accéder aux cours afin de préparer les exercices de cette unité d'enseignement, de naviguer dans les séquences vidéo, semaine par semaine et, au sein d'une semaine, séquence par séquence, de disposer de l'énoncé des exercices proposés . Outre la cartographie générale du cours, vous trouverez une cartographie semaine par semaine. Je vous souhaite une bonne navigation au sein de ce sujet passionnant. Fabrice Kordon,Professeur à l'Université Pierre & Marie Curie. Programmation sur Plateformes Mobiles (UPMC)