我想为所有UIBarButtonItems更改默认字体。我的应用程序的根视图控制器中有以下代码:
let attributes: [NSAttributedString.Key: Any] = [.font: UIFont.systemFont(ofSize: 30)]
UIBarButtonItem.appearance().setTitleTextAttributes(attributes, for: .normal)
UINavigationBar.appearance().titleTextAttributes = attributes
UINavigationBarAppearance().buttonAppearance.normal.titleTextAttributes = attributes
UIBarButtonItemAppearance().normal.titleTextAttributes = attributes
self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "foo", style: .plain, target: nil, action: nil)
尽管外观有所变化,但该栏按钮项目的字体仍是默认字体。如何设置默认字体?我知道我可以为每个单独的按钮按钮设置字体,但是我正在寻找一种广泛更改字体的方法。
iOS 13之前的版本
class AppDelegate : NSObject, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
if #available(iOS 13, *) {
}else{
let attributes: [NSAttributedString.Key: Any] = [.font: UIFont.systemFont(ofSize: 30)]
UIBarButtonItem.appearance().setTitleTextAttributes(attributes, for: .normal)
UINavigationBar.appearance().titleTextAttributes = attributes
}
return true
}
}
iOS 13
class MyNavigationController : UINavigationController {
override init(rootViewController: UIViewController) {
super.init(rootViewController: rootViewController)
if #available(iOS 13, *) {
let attributes: [NSAttributedString.Key: Any] = [.font: UIFont.systemFont(ofSize: 30)]
let appearance = UINavigationBarAppearance()
appearance.buttonAppearance.normal.titleTextAttributes = attributes
appearance.titleTextAttributes = attributes
self.navigationBar.standardAppearance = appearance
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
您可以使用UINavigationBarAppearance来自定义所有导航栏,但是您需要在导航栏的外观代理上设置standardAppearance-这样的调用:
UINavigationBarAppearance().buttonAppearance.normal.titleTextAttributes = attributes
UIBarButtonItemAppearance().normal.titleTextAttributes = attributes
单独执行任何操作,因为它们会创建一个新外观,设置一个值,然后将其丢弃。而是这样做:
let appearance = UINavigationBarAppearance()
appearance.buttonAppearance.normal.titleTextAttributes = attributes
UINavigationBar.appearance().standardAppearance = appearance