无法在最新 Xcode 版本的 Swift 中设置导航栏字体
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Cannot Set Navigation Bar Font in Swift on Latest Xcode Version
提问by Benji
The following code was running fine before updating to Xcode 6.1 to stay up with iOS 8.1:
以下代码在更新到 Xcode 6.1 以跟上 iOS 8.1 之前运行良好：
override func viewDidAppear(animated: Bool) {
self.navigationController?.navigationBar.topItem?.title = "Home"
self.navigationController?.navigationBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34), NSForegroundColorAttributeName: UIColor.whiteColor()]
}
The issue is specifically in NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34)
这个问题具体在 NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34)
and the error I'm getting here is:
我在这里遇到的错误是：
! "Could not find an overload for 'init' that accepts the supplied arguments"
! "Could not find an overload for 'init' that accepts the supplied arguments"
I found this original code on a different StackOverflow question and it was working as expected until this update (downloaded it yesterday). My font is indeed installed properly.
我在一个不同的 StackOverflow 问题上找到了这个原始代码，它在这个更新之前按预期工作（昨天下载了它）。我的字体确实安装正确。
Should I be writing this code differently now, or is there an entirely new way in which I should set my Navigation Bar Font?
我现在应该以不同的方式编写这段代码，还是有一种全新的方式来设置我的导航栏字体？
Thanks!
谢谢！
回答by Benji
Whoops. I figured this out on my own:
哎呀。我自己想出了这个：
I needed an exclamation point following my declaration of the NSFontAttributeName as it requires a type "NSString!". Perhaps it only required an "NSString" before, but I have no issues now.
我在声明 NSFontAttributeName 之后需要一个感叹号，因为它需要一个类型“NSString！”。也许它以前只需要一个“NSString”，但我现在没有问题。
Working line:
工作线：
NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 24)!
Working full code:
工作完整代码：
override func viewDidAppear(animated: Bool) {
self.navigationController?.navigationBar.topItem?.title = "Home"
self.navigationController?.navigationBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34)!, NSForegroundColorAttributeName: UIColor.whiteColor()]
}
Seems like a silly question now. Hope this helps someone else!
现在似乎是一个愚蠢的问题。希望这对其他人有帮助！
回答by codester
You are using UIFont(name:intializer as it is defined as
您正在使用UIFont(name:初始化器，因为它被定义为
init?(name fontName: String, size fontSize: CGFloat) -> UIFont
init?(name fontName: String, size fontSize: CGFloat) -> UIFont
failable intializerread more from link.So it is returning optional.You need to unwrap it as it require AnyObjectnot optional.
可失败的初始化器从链接中读取更多信息。因此它返回可选。您需要解开它，因为它不需要AnyObject可选。
self.navigationController?.navigationBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34)!, NSForegroundColorAttributeName: UIColor.whiteColor()]
回答by Steve Stomp
Thanks Benji!!!
谢谢本吉！！！
I changed it a bit and applied it to the appearance attribute of the navigation controller.
我稍微改动了一下，将它应用到导航控制器的外观属性上。
var navigationBarAppearance = UINavigationBar.appearance()
navigationBarAppearance.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "OpenSans", size: 16)!, NSForegroundColorAttributeName: UIColor.whiteColor()]
回答by IsPha
It is better to declare your font as conditional , like this way :
最好将您的字体声明为有条件的，如下所示：
if let font = UIFont (name: "AdobeArabic-BoldItalic", size: 20) {
UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName: font]
}
Doing this , makes sure that your font is already found , that I have installed new font , and when used it without conditional if , it issued an exception , of unwrapping an optional .
这样做，可以确保您的字体已经找到，我已经安装了新字体，并且在没有条件的情况下使用它时，它会发出一个异常，打开一个可选的 .
回答by A.G
override func viewWillLayoutSubviews() {
self.navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor(), NSFontAttributeName : UIFont(name: "Roboto-Regular", size: 14)!]
}
回答by Dary
Swift 4.2
斯威夫特 4.2
Change Small Titlewhen layout scrolled down
更改小标题布局时向下滚动
override func viewDidAppear(animated: Bool) {
self.navigationController?.navigationBar.topItem?.title = "Home"
self.navigationController?.navigationBar.titleTextAttributes = [ NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34), NSForegroundColorAttributeName: UIColor.whiteColor()]
}
Change Large Title
更改大标题
override func viewDidAppear(animated: Bool) {
self.navigationController?.navigationBar.topItem?.title = "Home"
self.navigationController?.navigationBar.largeTitleTextAttributes = [ NSFontAttributeName: UIFont(name: "Lobster 1.4", size: 34), NSForegroundColorAttributeName: UIColor.whiteColor()]
}
