例 1
UIViewController *vc = [UIViewController new];
[self.navigationController pushViewController:vc animated:YES];
上述代碼推出界面會(huì)卡頓
解決辦法：
UIViewController *vc = [UIViewController new];
vc.view.backgroundColor = [UIColor 推出時(shí)你想要的控制器View的顏色]
/**
*? 如
*/
vc.view.backgroundColor = [UIColor whiteColor];
[self.navigationController pushViewController:vc animated:YES];
