当我们push时 searchbar 会闪烁出现（就延迟了出现）
override func viewDidLoad() { navigationController?.navigationBarHidden = true//去除UISeachbar 的白边闪烁bug（在super前调用） super.viewDidLoad() } override func viewWillAppear(animated: Bool) { navigationController?.navigationBarHidden = false super.viewWillAppear(animated) searchBar.becomeFirstResponder() }
转载别人的