Date formatting has always been something that led to bugs in my code. In this post Nick helps you format dates in Swift.
The sooner you detect a problem, the cheaper it is to find and fix is the mantra from Jon in this post. Great post on turning on Xcode warnings.
Xcode now comes with Swift Playground but what if you wanted to test network requests ? Jon has the answer for you in this post on how to use XCPlayground to test network request.
While you build that awesome WathKit app, take a look at this post to figure out how to debug iOS app while WatchKit app is running.
Not so much of app design but this blog is useful if you are looking to design your app landing page on web.
Cast Study on how George went about designing a real estate property search app.
Need help with debugging? Nic's post helps you debug with Android Debug Bridge.
Want to use continuous delivery while building your app? Follow Ross' post for details.
With the advent of material design a lot of us have to redesign our apps, here are the reasons why Brenden decided to redesign his apps.
Patrick from Lyft on how they designed Split payment experience, pretty detailed analysis.