Instead you can start using the new Swift 4 compiler and migrate at your own pace, taking advantage of new Swift 4 features, one module at a time.

Swift is the result of the latest research on programming languages, combined with decades of experience building Apple platforms. Named parameters brought forward from Objective-C are expressed in a clean syntax that makes APIs in Swift even easier to read and maintain. Inferred types make code cleaner and less prone to mistakes, while modules eliminate headers and provide namespaces. These forward-thinking concepts result in a language that is easy and fun to use. Much like Swift Playgrounds for iPad, playgrounds in Xcode make writing Swift code incredibly simple and fun.

Type a line of code and the result appears immediately. You can then Quick Look the result from the side of your code, or pin that result directly below. The result view can display graphics, lists of results, or graphs of a value over time. You can open the Timeline Assistant to watch a complex view evolve and animate, great for experimenting with new UI code, or to play an animated SpriteKit scene as you code it.

Use Swift syntax to evaluate and interact with your running app, or write new code to see how it works in a script-like environment. Available from within the Xcode console or in Terminal.

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Introduced in Swift 3, Swift Package Manager is a cross-platform tool for building Swift libraries and executables, making it easy to create and manage dependencies. New API lets package authors define which products their packages make available to clients, and customize how their sources are organized on disk.

And the overall API used to create a package is now cleaner and clearer, while retaining source-compatibility with older packages. From its earliest conception, Swift was built to be fast. Using the incredibly high-performance LLVM compiler, Swift code is transformed into optimized native code that gets the most out of modern hardware.

The syntax and standard library have also been tuned to make the most obvious way to write your code also perform the best. Swift is a successor to both the C and Objective-C languages. It includes low-level primitives such as types, flow control, and operators. It also provides object-oriented features such as classes, protocols, and generics, giving Cocoa and Cocoa Touch developers the performance and power they demand. Swift eliminates entire classes of unsafe code.

Variables are always initialized before use, arrays and integers are checked for overflow, and memory is managed automatically. Syntax is tuned to make it easy to define your intent — for example, simple three-character keywords define a variable var or constant let. Another safety feature is that by default Swift objects can never be nil. In fact, the Swift compiler will stop you from trying to make or use a nil object with a compile-time error.

This makes writing code much cleaner and safer, and prevents a huge category of runtime crashes in your apps. However, there are cases where nil is valid and appropriate. For these situations Swift has an innovative feature known as optionals.

An optional may contain nil, but Swift syntax forces you to safely deal with it using the? You can create an entirely new application with Swift today, or begin using Swift code to implement new features and functionality in your app. Swift code co-exists along side your existing Objective-C files in the same project, with full access to your Objective-C API, making it easy to adopt. So, if you're going to integrate your app with HealthKit or Apple Pay, it's good to get to know those as well.

Do you want to build a high-performance app?

Here they are:. It's good to keep in mind that Apple tends to be very conservative with their app review process. Chances are, if you're making something even remotely risque, it will be rejected, so be mindful of that before you start making your app. Beyond Apple's review guidelines, they also have a set of design and interface guidelines.

Apple wants all the apps in their store to have some type of consistency, and while this doesn't have to mean good design, it does mean apps use the same basic UI elements. To get a grasp on this, check out Apple's Human Interface Guidelines page. Here, you'll find the basics of what they're looking for in both apps and icon design.

They also have a set of Do's and Don'ts that distill that massive guide down a little bit so it's easier to get started. Thankfully, Apple doesn't leave you totally in the dark on how to make a well designed app. Here are a few resources to get help you design something worthwhile:. You can also find plenty of resources online to help improve your design chops, or check out our guide.

Unless you're some kind of super genius, you probably don't want to create your app in a bubble. Instead, it's good to get other people to look at your code and invite beta testers to try your app out. GitHub is the go-to for software versioning and collaborative work. Once you register for GitHub, it's incredibly easy to link Xcode into it so everything you do is saved and accessible by other people on your team. If you need a little help setting up GitHub, their guides walk you through the process.

Likewise, beta testing is also incredibly easy in iOS 8. Using TestFlight , you can simply invite users to your team so they can test your app. They'll just need to download the TestFlight app. Developing for iOS is really all about familiarizing yourself with Xcode. Once you're comfortable there, you can write your app in a wide variety of languages or take a stab at learning Swift.

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As you move along to actually writing that app, you'll certainly need to dig up answers to more specific questions, but the tools above will get you started on the right path. The A. Thorin Klosowski.