隐藏搜索栏也隐藏导航栏标题

Question

我有 navigation bar 和 search 按钮。单击它会显示 searchbar 并在取消按钮上单击它会隐藏。但出于某种原因，如果 searchbar 被隐藏，那么导航栏 titleview 也会隐藏。什么会导致这个？一开始我其实是想让它从右边滑到titleView但是我做不到所以我就这样做了

这是显示和隐藏它的代码：

//Create searchbar
    func createSearchBar(){

        searchBar.showsCancelButton = true
        searchBar.tintColor = UIColor(red:0.184, green:0.996, blue:0.855, alpha:1.00)
        searchBar.placeholder = "Search brands"
        searchBar.delegate = self



        searchBar.hidden =  false
        searchBar.alpha = 0

        navigationItem.titleView = searchBar
        navigationItem.setLeftBarButtonItem(menuButton, animated: true)
        navigationItem.setRightBarButtonItem(searchButtton, animated: true)


        UIView.animateWithDuration(0.5, animations: {
            self.searchBar.alpha = 1
            }, completion: { finished in
                self.searchBar.becomeFirstResponder()
        })


    }

    //Searchbar hide
    func hideSearchBar() {


        navigationItem.setLeftBarButtonItem(menuButton, animated: true)
        navigationItem.setRightBarButtonItem(searchButtton, animated: true)
        searchBar.alpha = 0
        UIView.animateWithDuration(1, animations: {


            }, completion: { finished in

        })
    }

    //Searchbar cancel button
    func searchBarCancelButtonClicked(searchBar: UISearchBar) {
        hideSearchBar()
        searchBar.endEditing(true)
        snusBrandsTableView.reloadData()
    }

Answer 1

如果你想在隐藏 searchBar 时设置 title of navigationItem 你需要将 titleView 设置为 nil 然后设置标题。

func hideSearchBar() {
    navigationItem.setLeftBarButtonItem(menuButton, animated: true)
    navigationItem.setRightBarButtonItem(searchButtton, animated: true)
    searchBar.alpha = 0
    self.navigationItem.titleView = nil
    self.navigationItem.title = "YourTitle"
}

隐藏搜索栏也隐藏导航栏标题

Hiding searchbar hides navigation bar title also

uinavigationbar

swift