如何判断UIPrintInteractionController是否显示？

Question

有没有办法判断UIPrintInteractionController是否正在显示（可能类似于检查弹出框的方式）？

if ([popover isPopoverVisible]) {

    //the popover is visible

}

Answer 1

看起来您只需跟踪UIPrintInteractionControllerDelegate

即可跟踪自己

– printInteractionControllerWillPresentPrinterOptions:
– printInteractionControllerDidPresentPrinterOptions:
– printInteractionControllerWillDismissPrinterOptions:
– printInteractionControllerDidDismissPrinterOptions: