Tag Archive | "Objective-C"

Web Apps vs. Native Apps


When the iPhone was first launched, it didn’t launch with a marketplace for apps – indeed Apple didn’t even enable programmers to create applications for the platform at all. Quite quickly though, people worked out that you could create a web based application and style it specially to run in the iPhone screen. The Web App was born, and Apple quickly embraced this entrepreneurial approach by setting up a Web App directory. To have an app listed you just have to submit your URL to Apple and if it conforms to their loose rules and guidelines, it will be added to their listings.

The iPhone runs a very competent and capable Safari web browser which supports current web standards. Interactivity can be achieved using Javascript, there are even a few proprietary extensions to HTML and Javascript (undergoing formal approval to become standards) to cater for some of the capabilities of a touch and multitouch environment.

With the success of Web Apps, Apple took the bold decision to open up the iPhone platform to any programmer, making the SDK freely available, introducing a nominal fee to join their developer program, adding app support into iTunes and introducing a revenue-share model for app publishers. This was a game changing move which other mobile platforms have tried to replicate with mixed results.

Native applications are written in Objective-C, a superset of C and C++, and the SDK includes hundreds of API’s and libraries that allow any programmer to create the true ‘iPhone experience’ for their own applications. There’s a steep learning curve for anyone that hasn’t developed for the Mac platform before, but it’s a rewarding experience – Objective-C is an elegant language and the rich SDK often makes complex tasks relatively straightforward.

Programmers can still create web applications in favour of native applications, and if you don’t want formal listing in the app store or the web app directory, then there are no restrictions on what your app can do, how it behaves or on your business model – you can encourage people to add your app to their iPhone from your own website. However, you cannot recreate the rich experience of native applications, and such apps require an internet connection at all times. Much of the iPhone experience is down to the Wow factor given by:-

  • the animated interface
  • tab and navigation controllers
  • access to the camera, contacts and iTunes library
  • access to location information, compass data and movement data from the accelerometer

Most of this can only be replicated in a web app in a ‘hacky’ way that won’t make your app stand out, and doesn’t do the platform justice.

You can create ‘hybrid’ applications for the iPhone and many apps in the store take this approach. They take advantage of the native SDK to give the app the overall iPhone navigational experience, but they are filled with HTML content, either stored locally or on a remote web server. If your company has web content that you want embedded in your app, then this presents a great way to do this without having to maintain different information sources. Beware that apps taking this approach may display no content if there isn’t an internet connection, and part of Apple’s requirement is that apps handle lack of internet connectivity gracefully.

The ‘hybrid’ nature of such apps is achieved through a few simple mechanisms:

  • A screen (view) can contain a web ‘canvas’ (UIWebView) that you can populate with HTML, CSS and Javascript
  • The content of a UIWebView is addressed by a URN pointing to a local file or a remote resource
  • You can have multiple UIWebViews in a single screen (view)
  • Javascript can call out to Objective-C methods
  • Objective-C methods can call Javascript functions within a UIWebView

Learning just enough Objective-C to enable you to build hybrid applications is a great first step to learning how to do much more. At Mindsizzler’s we’re convinced that once you set out, you’ll enjoy the experience and will be thirsty to learn more!

If you need that introduction to learn how to create iPhone applications and achieve a good understanding of Objective-C, Xcode and the iPhone SDK then why not join in one of our training courses?

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