A Boolean value that determines whether the system repeats its emission and idle periods.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 3.0+
If this value is
YES (the default), you can make the system emit particles periodically or sporadically. For example, in a looping system where the
emission value is
1 seconds and the
idle value is
1 seconds, the system alternates alternates between equal one-second periods of spawning and not spawning particles. Use the
idle properties to randomize the duration of each emission and idle period, making the emission behavior more sporadic.
NO for particle systems that create one-shot effects, such as an explosion that appears when a game character is defeated.