Apple has just posted its developer documentation video explaining how apps can use the new complication types for the larger Apple Watch Series 4 display. These new complications are available on the Infograph and Infograph Modular watch faces.
Both Apple and third party developers can take advantage of the new curved corner gauges, full color graphs and images in the middle of the Infograph modular watch, and the ability to show custom bezel text on nearly 180 degrees of the dial.
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