iOS development

iOS7 default blue: R:0.0 G:122.0 B:255.0; #007AFF

Asynchronous image downloader with cache support as a UIImageView category:

ProgressHUD is a lightweight and easy-to-use HUD for iOS 8 (written in Objective-C):

The Reachability sample application demonstrates how to use the System Configuration framework to monitor the network state of an iOS device:

iPhone resolutions guide:

The Ultimate Guide To iPhone Resolutions

iOS versions statistic: