UIAlertController和UIActivityViewController在ipad中的兼容性问题

1、报错提示

• 1.1 UIAlertController

  • Terminating app due to uncaught exception 'NSGenericException', reason: 'Your application has presented a UIAlertController (<UIAlertController: 0x1048f5600>) of style UIAlertControllerStyleActionSheet from

• 1.2 UIActivityViewController

  • Terminating app due to uncaught exception 'NSGenericException', reason: 'Your application has presented a UIActivityViewController (<UIActivityViewController: 0x103840000>). In its current trait environment, the modalPresentationStyle of a UIActivityViewController with this style is UIModalPresentationPopover.

2、解决办法

• 问题原因：这两个crash原因都是因为在ipad上进行UIAlertController和UIActivityViewController的使用的时候，都需要瞄点。

• 2.1 UIAlertController

// 兼容ipad
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
  alert.popoverPresentationController.sourceView = sourceView;
  alert.popoverPresentationController.sourceRect = sourceView.bounds;
  alert.popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
}

• 2.1 UIActivityViewController

// 兼容ipad
if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
    vc.popoverPresentationController.sourceView = self.view;
    vc.popoverPresentationController.sourceRect = CGRectMake(self.view.frame.size.width/2.0, self.view.frame.size.height/2.0, 1.0, 1.0);
    vc.popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirectionAny;
}

• 提示：其中vc就是对应的UIAlertController、UIActivityViewController的实例对象。