如何在 Xcode 中左对齐导航栏的标题? [英] How do I left align the title of a navigation bar in Xcode?

问题描述

为了使导航栏的标题左对齐，我一直在尝试以下方法:

I've been trying the following in order to get the title of a navigation bar left aligned:

在 AppDelegate.swift 文件中:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.


    UINavigationBar.appearance().barTintColor = UIColor.red
    UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName:
        UIColor.white]
    return true
}

在 TableViewController.swift 文件中:

override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        self.navigationController?.navigationBar.topItem?.title = "Home"
    }

但我发现没有什么能解决问题.我还尝试了我在此处找到的以下内容，但没有显示任何内容:

but nothing I find solves the problem. I also tried the following that I found on here which does not show anything:

在 AppDelegate.swift 文件中:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.


    UINavigationBar.appearance().barTintColor = UIColor.red
    UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName:
        UIColor.white]
let lbNavTitle = UILabel (frame: CGRect(x: 0, y: 40, width: 320, height: 40))
    lbNavTitle.center = CGPoint(x: 160, y: 285)
    lbNavTitle.textAlignment = .left
    lbNavTitle.text = "Home"
    self.navigationItem.titleView = lbNavTitle

在 TableViewController.swift 文件中:

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    self.navigationController?.navigationBar.topItem?.title = "Home"
    let lbNavTitle = UILabel (frame: CGRect(x: 0, y: 0, width: 320, height: 40))
    lbNavTitle.backgroundColor = UIColor.red
    lbNavTitle.textColor = UIColor.black
    lbNavTitle.numberOfLines = 0
    lbNavTitle.center = CGPoint(x: 0, y: 0)
    lbNavTitle.textAlignment = .left
    lbNavTitle.text = "Home"

    let string = NSMutableAttributedString ("Title/nSubTitle")

    self.navigationItem.titleView = lbNavTitle
}

推荐答案

您可以使用 navigationItems titleView 添加左对齐的 UILabel，然后使用自动布局设置其框架，如下所示:

You can use the navigationItems titleView to add a UILabel with left alignment and then set its frame using auto layout like this:

let label = UILabel()
label.text = "Title Label"
label.textAlignment = .left
self.navigationItem.titleView = label
label.translatesAutoresizingMaskIntoConstraints = false
label.superview?.addConstraint(NSLayoutConstraint(item: label, attribute: .centerX, relatedBy: .equal, toItem: label.superview, attribute: .centerX, multiplier: 1, constant: 0))
label.superview?.addConstraint(NSLayoutConstraint(item: label, attribute: .width, relatedBy: .equal, toItem: label.superview, attribute: .width, multiplier: 1, constant: 0))
label.superview?.addConstraint(NSLayoutConstraint(item: label, attribute: .centerY, relatedBy: .equal, toItem: label.superview, attribute: .centerY, multiplier: 1, constant: 0))
label.superview?.addConstraint(NSLayoutConstraint(item: label, attribute: .height, relatedBy: .equal, toItem: label.superview, attribute: .height, multiplier: 1, constant: 0))

这篇关于如何在 Xcode 中左对齐导航栏的标题?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！