UICollectionViewFlowLayout and auto layout on iOS

UICollectionViewFlowLayout is layout object supplied by UIKit and enables showing items in grid. It allows customising spacings and supports fixed size cells and cells with different sizes. This time I am going to show how to build a collection view containing items with different sizes where sizes are defined by auto layout constraints. Cell sizes …

Instantiating view controllers from UIStoryboard on iOS

There are several ways how to create user interfaces on iOS: programmatically, xib per view or using storyboard for multiple views. Personally I tend to use xibs and programmatically created layouts more but sometimes I also use UIStoryboard - depends on the situation on hand. Therefore I like to present two small additions to UIStoryboard …

Basic debugging in Xcode

Printing object description Probably the most used command when debugging apps is po. It evaluates the expression and prints out the object description. When printing custom objects, it should be noted that the format of the result can be customised by implementing debugDescription in CustomDebugStringConvertible protocol. Modifying code in runtime LLDB's expression command allows executing code when …

Circle shaped collection view layout on iOS

UICollectionViewLayout's responsibility is to define layout: all the cell locations and sizes. It acts like a data source object which provides layout related information to the collection view. Collection view then uses that information for creating cells and placing them on screen. This time we'll take a look on how to create a custom circle …

Particle emitters for apps with CAEmitterLayer on iOS

Particle emitters are encountered the most often in games. Apple's SpriteKit framework contains SKEmitterNode for this exact purpose. Moreover, Xcode even has a live editor for configuring SKEmitterNode. As SKEmitterNode can only be added to SKScene, it is not a good fit for apps. But no worries, apps can take advantage of CAEmitterLayer which is …