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ipad和iphone使用UIAlertViewController

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ipad和iphone使用UIAlertViewController

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id aController;
    if(DKDeviceiPad){
    alertC.modalPresentationStyle = UIModalPresentationPopover;
    UIPopoverPresentationController *popPc = alertC.popoverPresentationController;
    popPc.barButtonItem = self.downloadItem;
    popPc.permittedArrowDirections = UIPopoverArrowDirectionAny;
    aController = alertC;
}else{
    aController = alertC;
}
[window.rootViewController presentViewController:aController animated:YES completion:nil];