presentViewController底部弹框适配ipad

//适配ipad

if ([alert respondsToSelector:@selector(popoverPresentationController)]) {

alert.popoverPresentationController.sourceView = self.view;

alert.popoverPresentationController.sourceRect = CGRectMake(0, kScreenHeight, kScreenWidth, kScreenHeight);

}

[self presentViewController:alert animated:YES completion:nil];