func compositionPickerViewWillStopAnimating (QCCompositionPickerView!)
Performs custom tasks when the composition picker view stops animating a composition.
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func compositionPickerViewDidStartAnimating(_ pickerView: QCCompositionPickerView
!)
pickerView
The composition picker view in which the composition started animating.
Quartz Composer invokes this method when the composition picker view starts animating a composition. Implement this method if you want to perform custom tasks at that time.
func compositionPickerViewWillStopAnimating (QCCompositionPickerView!)