显示 UIPopOverPresentationController 时崩溃答案

【问题标题】：crash on showing UIPopOverPresentationController显示 UIPopOverPresentationController 时崩溃
【发布时间】：2015-11-25 14:44:30
【问题描述】：

*** 由于未捕获的异常“NSGenericException”而终止应用程序，原因：“UIPopoverPresentationController (<_uialertcontrolleractionsheetregularpresentationcontroller:>) 应该在演示发生之前设置非零的 sourceView 或 barButtonItem。”

【问题讨论】：

请在您展示弹出框控制器的位置显示代码。
是不是因为我在 iPad Simulator 中运行？
ActionSheet not working iPad的可能重复

标签： ios swift crash uipopovercontroller

【解决方案1】：

self.dismissViewControllerAnimated(true, completion: nil)
        let textToShare:String = "Lets have a chat!";
        let activityVC:UIActivityViewController = UIActivityViewController(activityItems: [textToShare], applicationActivities: nil)
        let excludeActivities = [UIActivityTypeAirDrop, UIActivityTypePrint, UIActivityTypeSaveToCameraRoll, UIActivityTypeAssignToContact, UIActivityTypePostToFlickr, UIActivityTypePostToTencentWeibo, UIActivityTypePostToVimeo, UIActivityTypePostToTencentWeibo]
        activityVC.excludedActivityTypes = excludeActivities
        activityVC.modalPresentationStyle =  UIModalPresentationStyle.FormSheet
 presentViewController(activityVC, animated: true, completion: nil)

【讨论】：

【解决方案2】：

我用下面的代码修改并找到了解决方案。

if (DeviceType.IS_IPAD == false)
{
    presentViewController(activityVC, animated: true, completion: nil)
}else {
    // Change Rect to position Popover
    let popUp = UIPopoverController(contentViewController: activityVC)
    popUp.presentPopoverFromRect(CGRectZero, inView: self.view, permittedArrowDirections: UIPopoverArrowDirection.Any, animated: true)
}

【讨论】：