UIActivityViewController iOS8 iPad Crash处理

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在iPhone 上程序一切正常，但独在iPad iOS8的系统上,UIActivityViewController会崩溃，经查阅资料：

On iPad the activity view controller will be displayed as a popover using the newUIPopoverPresentationController, it requires that you specify an anchor point for the presentation of the popover using one of the three following properties:

barButtonItem
sourceView
sourceRect

In order to specify the anchor point you will need to obtain a reference to the UIActivityController's UIPopoverPresentationController and set one of the properties as follows:

activityViewController.popoverPresentationController.sourceView = parentView;// 或者 activityViewController.popoverPresentationController.barButtonItem = _actionButton;// 或者SourceRect(不再举例)

资料地址: http://stackoverflow.com/questions/25644054/uiactivityviewcontroller-crashing-on-ios8-ipads

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