After 4 years, iOS developers can now interact with WhatsApp via URL Schema

In their latest release, WhatsApp has introduced their app URL schema.

For example, the following URL will open WhatsApp from your app, with the message and user prefilled.

whatsapp://send?text=Hello%2C%20World!&abid=1234

At the same time, the app has changed from fixed paid app to auto-renewable subscription. So they earn $0.99 every year!

Interestingly, didn't Apple say auto-renewable subscription is only for apps that has new content?

Guides for iOS library design

Matt Gemmell had written 25 good rules for API design, specifically for developers writing iOS/Mac libraries, frameworks, or resuable components.

Google Data API - New Objective-C Library

Google has released a new Objective-C library for Google Data APIs. 

In this release, they have added new services – Tasks, Books, Latitude and URL shortener.

If you are building iPhone/iPad apps, or Mac apps, you ought to check out this library.