Atlas is a fully featured, high performance, 100% customizable UI kit, built by Layer to power communications interfaces in any app.

                  
                  
                  
                
// Easily configure the UI appearance by changing the
// TextColor, TextFont, and ViewColor attributes.
- (void)configureGlobalUserInterfaceAttributes
{
  [[ATLOutgoingMessageCollectionViewCell appearance]
    setMessageTextColor:[UIColor blueColor]];
  [[ATLOutgoingMessageCollectionViewCell appearance]
    setMessageTextFont:[UIFont systemFontOfSize: 17]];
  [[ATLOutgoingMessageCollectionViewCell appearance]
    setBubbleViewColor:[UIColor grayColor]];
}