Enabling On-Demand Resources
On-demand resources are enabled by default for apps targeting iOS 9.0 or later. You can manually change this in the build settings for a target (Figure 2-1).
In the project navigator, select the project file.
In the project editor, select the target.
Select the Build Settings pane.
Show the Assets category.
Set the value of the Enable On-Demand Resources setting.
Yes enables on-demand resources for the target.
No disables on-demand resources for the target.
On-Demand Resources Essentials