調(diào)用[mAppDelegate.rootNavigationController presentViewController:vc animated:YES completion:nil];
顯示一個(gè)模態(tài)界面后,再次調(diào)用[mAppDelegate.rootNavigationController presentViewController:vc animated:YES completion:nil];顯示UIAlertController,將不會(huì)顯示出來(lái)可训。
解決方法:[vc presentViewController:ac animated:YES completion:nil]
這樣就可以在模態(tài)界面vc上面顯示UIAlertController