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How to Uninstall iOS Apps on the Simulator and Reset Your Device

You uninstall iOS applications on the Simulator the same way you do on the iPad, except you use your mouse instead of your finger. To uninstall an app, just follow these simple steps: [more…]

How to Use Asset Catalogs to Develop Your iOS App

Now that there are several screen sizes for iPhones and (currently) two resolutions, your iOS app images need to be managed in a more sophisticated way than in the past. Initially, images had specific [more…]

How to Use Frameworks to Develop an iOS App

A framework offers common code that provides generic functionality for your iOS app. The iOS SDK provides a set of frameworks for incorporating technologies, services, and features into your apps. For [more…]

How to Use Design Patterns to Develop an iOS App

When it comes to iOS app development, the framework does a lot of the heavy lifting for you. That’s all well and good, but working with that framework is a little more complicated than just letting it [more…]

How to Use the Model-View-Controller (MVC) Design Pattern to Develop an iOS App

The iOS frameworks are object oriented. An easy way to understand what that really means is to think about a team working in an office. The work that needs to get done is divided up and assigned to individual [more…]

How to Use Views for iOS App Development

In an iOS app world, view objects are responsible for the view functionality in the Model-View-Controller architecture. A view is a rectangular area on the screen [more…]

How to Use View Controllers to Develop Your iOS App

The storyboard — the whiteboard, so to speak, is where you lay out the flow of the elements, or design pattern, of your iOS app. The controller objects contain the code that connects the app’s view objects [more…]

Frameworks You Can Use to Develop Your iOS App

The UIKit frameworks sole purpose in life is to provide an iOS app developer with all the classes an app needs in order to construct and manage its user interface. The [more…]

How to Create Your iOS App User Interface in the iPad Storyboard

Storyboard is a great tool for creating your iOS app user interface. In the Project navigator, select the Main_iPad.storyboard file and you’ll see several view controllers in the Document Outline [more…]

What You Should Know about iPad Navigation to Develop Your iOS App

Although the iPhone and iPad are very similar, one area in which they differ is in how a user can navigate through an iOS application. For example, in iPhone apps that use a master-detail architecture, [more…]

How to Add a New View Controller to Your iOS App

Your first step in adding a new view controller to your iOS app is to select the iPad storyboard file in the Project navigator. With the storyboard displayed, you then make sure that the Utility area is [more…]

View Layout Options for Your iOS App

Before you start to add another view to your iOS app — which will be a subview of the view that's already there — it’s necessary to talk about view layout options. View layout is particularly important [more…]

How to Add a Background Image to Your iOS App

Get ready to start editing and adding some objects to your iOS app. To edit an object in the TestDrive view in the storyboard, select Main_iPad.storyboard [more…]

How to Create the iPhone User Interface for Your iOS App

Many times, iOS app programmers will write code for the iPad. All the code that you write for the iPad will work fine for the iPhone. All you need to do is add the following items to your iPhone storyboard [more…]

How to Autosize an Image with Auto Layout for Your iOS App

Because you’re sure to decide — as all good iOS app developers have decided and will continue to decide in perpetuity — that your app needs to function well in both Portrait and Landscape orientations, [more…]

How to Add a Button to Your iOS App

The more objects, the merrier. Let’s say you want to add a nice Test Drive button to your iOS app which, when clicked, will send our 1959 Cadillac Eldorado Biarritz convertible on its merry way. Here’s [more…]

How to Customize the Behavior of iOS Framework Classes: Subclassing and Delegating

Although you'll be creating classes of your own (especially model classes) for your iOS app, often you’re going to want to customize the behavior of a particular framework class. You have three ways to [more…]

How to Use UIApplicationMain to Develop Your iOS App

The UIApplicationMain function is important for iOS app development. It creates the application object (a singleton — the only — UIApplication object) and the [more…]

What Should I Do When the Normal Processing of My iOS Application is Interrupted?

On an iOS device, various events besides termination can interrupt your app to allow the user to respond and your app moves into the inactive state. If the user chooses to ignore an interruption, your [more…]

How to Manage Memory for You iOS App

As powerful as it is, the iPhone — and even the iPad — are limited in resources, and the most critical of these resources for iOS apps is memory. To truly understand how to manage memory correctly in your [more…]

How to Use Automatic Reference Counting (ARC) for Your iOS App

You may want to use ARC for your iOS app. Automatic reference counting (ARC) is a compiler-level feature that simplifies the process of managing the lifetimes of Objective-C objects. Instead of you having [more…]

How to Observe Low-Memory Warnings in Your iOS App

Even if you've done everything correctly, in a large iOS app, you may simply run out of memory. When that situation occurs, the system dispatches a low-memory notification to your app — and it’s something [more…]

How to Use Declared Properties in Your iOS App

Although properties and instance variable access and accessors are often mashed together in the minds of iOS app programmers, make sure that you understand the unique nature of properties and how they [more…]

How to Set Attributes for an iOS App Declared Property

You can set certain property attributes when you declare a property for your iOS app. Take a look to discover more details about the attributes you can set when programming. [more…]

How to Hide Instance Variables in Your iOS App

When properties were first developed for iOS app programming, they were looked at as a way to avoid the tedium of writing accessors for instance variable-based properties. People used to think about properties [more…]


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