If UIKit standard controls aren't enough for you, Yari has the solution in this post with the bonus of it being in Swift.
Looks like Apple doesn't have right instructions to open the app from "Today" extension aka Widgets. Daniel has written a great post on how he found out about it and how to fix it.
UITextView a lot of times feels limited in it's functionality, this library from LinkedIn helps with extending it and gives an example of how to implement @ mentions using it.
In this post William talks about design psychology and the fact that most design decisions are made in conversations. It's a really nice talk on how our brain takes criticism and how we can overcome it.
If you are the kind of designer who likes to work in Xcode, this post is for you. Mathew illustrates in this post how to build adaptive layouts for iPhone 6 and the settings in Xcode that allows us to do it effectively.
In this post Paul writes about how to build multiple custom views that can be used in various layouts and updated by passing data to one container view per layout.
Looking to implement an upload progress bar? Ravi has the tutorial for you.
Cyril writes about how to manage the dynamic grid-based UI effectively.
Cool tool to generate color palette and visualize how it will look like.
When it comes to porting an app from iOS to Android, design is an important consideration because iOS and Android follow different design conventions. This post from Zack helps us think about issues that should be considered.