ios - 如何更改导航栏中 titleView 的大小。因为在 navigationBar 的 titleView 和 backButton 之间有一个空隙

Question

我已经在我的 navigation.titleView 中添加了一个搜索栏

    self.navigationItem.titleView = searchBar

还有一个带有 title = ""的 BackBarButtonItem

    self.navigationItem.backBarButtonItem?.title = ""

但是 Back Button 和 SearchBar 之间存在间隙，如下所示:

我认为这里出现间隙是因为 backBarButtonItem 的 title 有空间(因为我的 title 是 null ""但空间仍然那里)

所以我想问一下如何省略那个间隙？我想让我的 searchBar 更靠近我的 backBarIcon

非常感谢!

编辑 1: 我尝试更改 searchBar 的框架，但它不起作用

这是我的代码

    //Change searchBar's frame        
    let titleViewFrame = (searchController.searchBar.frame)
    searchController.searchBar.frame = CGRect(x: titleViewFrame.minX - 20.0, y: titleViewFrame.minY, width: titleViewFrame.width + 20.0, height: titleViewFrame.height)

Answer 1

override func viewDidLoad() {
    super.viewDidLoad()

    let container = UIView(frame: CGRect(x: 0, y: 0, width: 1000, height: 22))

    let searchBar = UISearchBar()
    searchBar.translatesAutoresizingMaskIntoConstraints = false
    container.addSubview(searchBar)

    let leftButtonWidth: CGFloat = 35 // left padding
    let rightButtonWidth: CGFloat = 75 // right padding
    let width = view.frame.width - leftButtonWidth - rightButtonWidth
    let offset = (rightButtonWidth - leftButtonWidth) / 2

    NSLayoutConstraint.activate([
        searchBar.topAnchor.constraint(equalTo: container.topAnchor),
        searchBar.bottomAnchor.constraint(equalTo: container.bottomAnchor),
        searchBar.centerXAnchor.constraint(equalTo: container.centerXAnchor, constant: -offset),
        searchBar.widthAnchor.constraint(equalToConstant: width)
    ])


    self.navigationItem.titleView = container
}