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你们怎么能告诉一下UIPrint InteractionController是否正在显示?
原标题:How can you tell if a UIPrintInteractionController is showing?

是否有办法说明(可能与你检查人口的方式相类似)是否显示有<条码>的可疑交易。

if ([popover isPopoverVisible]) {

    //the popover is visible

}
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