ios 快速更改 titleTextAttribute
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Changing titleTextAttribute in swift
提问by Peter Pik
Every since i updated xcode i cant seem to change the titleTextAttribute. Now when i use following code i get this error:
自从我更新 xcode 以来，我似乎无法更改titleTextAttribute. 现在，当我使用以下代码时，出现此错误：
could not find an overload init that accepts this supplied arguments
找不到接受此提供的参数的重载 init
Code in appDelegate:
代码appDelegate：
UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName: UIFont(name: "Ubuntu", size: 17), NSForegroundColorAttributeName:UIColor.whiteColor()]
UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Ubuntu-Light", size: 15), NSForegroundColorAttributeName:UIColor.whiteColor()], forState: UIControlState.Normal)
回答by Nate Cook
There was a recent change so that UIFont(name:size:)returns an optional UIFontinstance. You'll need to unwrap them to get it to work. Using !is the easiest way, but will get you a crash if the font isn't on the system. Try something like:
最近发生了变化，因此UIFont(name:size:)返回了一个可选UIFont实例。您需要打开它们才能使其正常工作。使用!是最简单的方法，但如果字体不在系统上，则会导致崩溃。尝试类似：
let navbarFont = UIFont(name: "Ubuntu", size: 17) ?? UIFont.systemFontOfSize(17)
let barbuttonFont = UIFont(name: "Ubuntu-Light", size: 15) ?? UIFont.systemFontOfSize(15)
UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName: navbarFont, NSForegroundColorAttributeName:UIColor.whiteColor()]
UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: barbuttonFont, NSForegroundColorAttributeName:UIColor.whiteColor()], forState: UIControlState.Normal)
回答by Steve Moser
Swift 4:
斯威夫特 4：
UIBarButtonItem.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.white], for: .normal)
UINavigationBar.appearance().titleTextAttributes = [
NSAttributedStringKey.foregroundColor: UIColor.white
]
回答by Andrey Kirsanov
For Swift 3 you could try the following:
对于 Swift 3，您可以尝试以下操作：
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
回答by Satyam
Swift 4:
斯威夫特 4：
if let navFont = UIFont(name: "Futura", size: 18) {
let navBarAttributesDictionary: [NSAttributedStringKey: Any] = [
NSAttributedStringKey(rawValue: NSAttributedStringKey.foregroundColor.rawValue): UIColor(netHex: Colors.BabyBlue.rawValue),
NSAttributedStringKey(rawValue: NSAttributedStringKey.font.rawValue): navFont ]
UINavigationBar.appearance().titleTextAttributes = navBarAttributesDictionary
}
回答by Durul Dalkanat
if let navFont = UIFont(name: "HelveticaNeue-Bold", size: 30.0) {
let navBarAttributesDictionary: [NSObject: AnyObject]? = [
NSForegroundColorAttributeName: UIColor.blackColor(),
NSFontAttributeName: navFont
]
navigationController?.navigationBar.titleTextAttributes = navBarAttributesDictionary
}
回答by Sazzad Hissain Khan
Swift 5
斯威夫特 5
navBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor:titleColor]
