如何在swift 3中更改标签栏字体 [英] How can I change tab bar font in swift 3

问题描述

我的朋友。我是swift和ios的新手。

i希望在swift 3和xcode 8中更改我的标签栏字体。



但我有问题。



i在appDelegate.swift中的方法func application（_ application：UIApplication，didFinishLaunchingWithOptions launchOptions：[UIApplicationLaunchOptionsKey：Any]？） - > Bool中编写此代码：

hi my friend. i am new in swift and ios.
i want change my tab bar font in swift 3 and xcode 8.

but i have problem.

i write this code in "AppDelegate.swift" in method "func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool :"

UITabBarItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "IRANSansWeb.ttf", size: 10)!], for: .normal)

但我有这个错误：

but i have this error:

fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb) 

什么是解决方案???



我尝试过的方法：

what is the solution???

What I have tried:

UITabBarItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "IRANSansWeb.ttf", size: 10)!], for: .normal)

推荐答案

在UITabBarItem调用之前创建字体。我猜它是零，因为Font是nil，因为它被拼错了。



尝试详细了解错误消息。

Create the Font before the UITabBarItem call. I guess it is nil, because the Font is nil because it is mispelled.

Try to understand the error messages in detail.

这篇关于如何在swift 3中更改标签栏字体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！