在Swift中更改选项卡栏字体

Question

我一直在尝试更改选项卡栏目的字体，但是我无法找到任何Swift示例。 我知道这是如何在Objective-C中更改它的：

[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont fontWithName:@"AmericanTypewriter" size:20.0f], UITextAttributeFont, nil] forState:UIControlStateNormal];

但是我该如何将这个翻译成Swift呢？

- user3746428

Answer 1

iOS 7中已弃用UITextAttributeFont，您应改用NS变体：

import UIKit

let appearance = UITabBarItem.appearance()
let attributes = [NSFontAttributeName:UIFont(name: "American Typewriter", size: 20)]
appearance.setTitleTextAttributes(attributes, forState: .Normal)

- AlBlue

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没关系，我把代码放在awakeFromNib里面了，问题解决了。非常感谢！ - user3746428

注意：使用 Playground 是发现这种问题的好方法。您还可以访问 http://swifter.natecook.com 查找一些名称。 - AlBlue

截至XCode 6.1，这似乎不起作用。我得到了一个“NSString”与“NSObject”不相同的错误。你们也遇到过这种情况吗？ - Andres C

从6.1版本开始，您必须拆开字体。只需在字体初始化后加上!。 - WCByrne

这对于.selected状态不改变我的字体。 - AydinAngouti

Answer 2

Swift 4.2

UITabBarItem.appearance().setTitleTextAttributes([NSAttributedString.Key.font: UIFont(name: "FontName", size: 10)!], for: .normal)
UITabBarItem.appearance().setTitleTextAttributes([NSAttributedString.Key.font: UIFont(name: "FontName", size: 10)!], for: .selected)

Swift 4

UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "FontName", size: 10)!], for: .normal)
UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "FontName", size: 10)!], for: .selected)

Swift 3

UITabBarItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Font-Name", size: 10)!], for: .normal)
UITabBarItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Font-Name", size: 10)!], for: .selected)

注意: 使用 setTitleTextAttributes 方法时需要同时针对 .normal 和 .selected 两种状态进行设置，以确保更改在选择状态变化后仍然有效。

- iOS.Lover

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这不会改变我在.selected状态下的字体。 - AydinAngouti

@AbbasAngouti- 你只需要复制代码并将 .normal 更改为 .selected 即可。 - Kevin Jantzer

我应该把这段代码放在哪里？我应该为TabBarController创建一个类吗？ - bibscy

可以确认它对所选内容不起作用。 - Peter Lapisu

Answer 3

将以下代码放在didFinishLaunchingWithOptions方法中：

UITabBarItem.appearance()
    .setTitleTextAttributes(
        [NSAttributedStringKey.font: UIFont(name: "Didot", size: 10)!], 
    for: .normal)

这适用于Swift 4

- Richard

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对我来说，在UITabBarItem.appearance()上调用此方法没有起作用。不得不将其替换为self.navigationItem.rightBarButtonItem。 - Marcin D

Answer 4

Swift 5

let appearance = UITabBarItem.appearance()
let attributes = [NSAttributedString.Key.font:UIFont(name: "American Typewriter", size: 20)]
appearance.setTitleTextAttributes(attributes as [NSAttributedString.Key : Any], for: .normal)

- Dani

Answer 5

除了@Mc.Lover的回答外，如果您想将此更改应用于应用程序中的所有标签栏项目，我建议将代码添加到AppDelegate类的application函数中：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    //Just add this line to get it done.       
    UITabBarItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "IranSansMobile", size: 15)!], for: UIControlState.normal)

    return true
}

- Milad Faridnia

Answer 6

还有一个答案，但针对的是：

if #available(iOS 15, *) {
    let tabBarAppearance = UITabBarAppearance()
    tabBarAppearance.backgroundColor = backgroundColor
    tabBarAppearance.stackedLayoutAppearance.selected.titleTextAttributes = [.foregroundColor: selectedItemTextColor, .font: UIFont(name: "American Typewriter", size: 20)]
    tabBarAppearance.stackedLayoutAppearance.normal.titleTextAttributes = [.foregroundColor: unselectedItemTextColor, .font: UIFont(name: "American Typewriter", size: 20)]
    tabBar.standardAppearance = tabBarAppearance
    tabBar.scrollEdgeAppearance = tabBarAppearance
}

- McDonal_11

Answer 7

Swift 4.2

    UITabBarItem.appearance().setTitleTextAttributes([NSAttributedString.Key.font: UIFont(name: "BahijTheSansArabic-Plain", size: 10)!], for: .normal)
    UITabBarItem.appearance().setTitleTextAttributes([NSAttributedString.Key.font: UIFont(name: "BahijTheSansArabic-Plain", size: 10)!], for: .selected)

- Ahmed Safadi

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在AppDelegate.swift文件中的application函数内，具体为application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { }。 - Ahmed Safadi

Answer 8

在Swift4版本中，您可以使用属性键来设置字体和前景色。

UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor(hexString: "#D8FFE8"), NSAttributedStringKey.font : UIFont(name: "HelveticaNeue-Bold", size: 16) as Any], for: .normal)
    UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor(hexString: "#FFFFFF"),NSAttributedStringKey.font : UIFont(name: "HelveticaNeue-Bold", size: 16) as Any], for: .selected)

- Madhav bhogapurapu

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无法在所选中运行 - Peter Lapisu