Question

我知道要在屏幕上设置元素的自定义字体，我只需someLabel.font=UIFont(name: "Exo 2.0", size: 15)即可。

我想知道如何使用swift为整个应用设置它。（对于应用程序的每个元素，黑客都会做我所知道的，但这只是一个可维护性的噩梦）

我看到这个问题已经被一个Objective-C标签How to set a custom font for entire iOS app without specifying size询问了，但我对Objective-C不够熟悉，足以将代码移植到swift

Answer 1

您可以设置UILabel和其他UIViews的外观：

UILabel.appearance().font = UIFont(name: "yourFont", size: yourSize)

更多一般：

AnyUIView.appearance().font = UIFont(name: "yourFont", size: yourSize)

Answer 2

作为更详细的答案，我建议使用扩展程序：

没有尺寸覆盖（无论您在设计师中设置的是什么）都将使用
没有样式覆盖（Bold，Light，Medium，UltraLight在我的代码中实现，但您可以根据需要自定义）

import UIKit

extension UILabel {
    public var substituteFontName : String {
        get {
            return self.font.fontName;
        }
        set {
            let fontNameToTest = self.font.fontName.lowercased();
            var fontName = newValue;
            if fontNameToTest.range(of: "bold") != nil {
                fontName += "-Bold";
            } else if fontNameToTest.range(of: "medium") != nil {
                fontName += "-Medium";
            } else if fontNameToTest.range(of: "light") != nil {
                fontName += "-Light";
            } else if fontNameToTest.range(of: "ultralight") != nil {
                fontName += "-UltraLight";
            }
            self.font = UIFont(name: fontName, size: self.font.pointSize)
        }
    }
}

extension UITextView {
    public var substituteFontName : String {
        get {
            return self.font?.fontName ?? "";
        }
        set {
            let fontNameToTest = self.font?.fontName.lowercased() ?? "";
            var fontName = newValue;
            if fontNameToTest.range(of: "bold") != nil {
                fontName += "-Bold";
            } else if fontNameToTest.range(of: "medium") != nil {
                fontName += "-Medium";
            } else if fontNameToTest.range(of: "light") != nil {
                fontName += "-Light";
            } else if fontNameToTest.range(of: "ultralight") != nil {
                fontName += "-UltraLight";
            }
            self.font = UIFont(name: fontName, size: self.font?.pointSize ?? 17)
        }
    }
}

extension UITextField {
    public var substituteFontName : String {
        get {
            return self.font?.fontName ?? "";
        }
        set {
            let fontNameToTest = self.font?.fontName.lowercased() ?? "";
            var fontName = newValue;
            if fontNameToTest.range(of: "bold") != nil {
                fontName += "-Bold";
            } else if fontNameToTest.range(of: "medium") != nil {
                fontName += "-Medium";
            } else if fontNameToTest.range(of: "light") != nil {
                fontName += "-Light";
            } else if fontNameToTest.range(of: "ultralight") != nil {
                fontName += "-UltraLight";
            }
            self.font = UIFont(name: fontName, size: self.font?.pointSize ?? 17)
        }
    }
}

使用扩展程序的示例：

e.g。将这些行放在起始控制器viewDidLoad

中

    UILabel.appearance().substituteFontName = "IRANSans"; // USE YOUR FONT NAME INSTEAD
    UITextView.appearance().substituteFontName = "IRANSans"; // USE YOUR FONT NAME INSTEAD
    UITextField.appearance().substituteFontName = "IRANSans"; // USE YOUR FONT NAME INSTEAD

P.S。正如@Christian所提到的，你可以为几乎AnyUIView编写自己的扩展

Answer 3

最终弄清楚了这一点。我能找到的最干净的方法。（快速4）解决方案不需要您设置字体大小，也不会覆盖所有字体大小。

  UILabel.appearance().font = UIFont.preferredFont(forTextStyle: UIFontTextStyle(rawValue: "Roboto"))

适合那些寻找将代码放置在何处的人。我将其放在

内的AppDelegate.swift文件中

 func application(_ application: UIApplication, 
 didFinishLaunchingWithOptions...

Swift 4.2

 UILabel.appearance().font = UIFont.preferredFont(forTextStyle: UIFont.TextStyle(rawValue: "Roboto"))

Answer 4

我在 Swift 4 with iOS 11

中找到了一种方法

只需在变量名称前添加'admin' => [ 'identityClass' => 'app\models\adminUsers', 'enableAutoLogin' => true, 'identityCookie' => [ 'name' => '_backendUser', // unique for backend 'path' => '/advanced/backend/web' // correct path for backend app. ] ],关键字。所以变量声明就像这样

@objc

希望这可以帮助那些面临这个问题的人。

Answer 5

答案是已经提供的答案的组合，但是我不得不尝试多种方法才能使其在iOS 13中运行：

所有这些都放置在Table View Controller中，该控件与UIFontPickerViewControllerDelegate兼容，以便为用户提供选择字体的视图。这将使用新字体更新所有UILabel，但保留其他属性。

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let cell = tableView.cellForRow(at: indexPath)

    if cell === fontCell {
        if #available(iOS 13, *) {
            let configuration = UIFontPickerViewController.Configuration()
            configuration.includeFaces = true

            let fontVC = UIFontPickerViewController(configuration: configuration)
            fontVC.delegate = self

            present(fontVC, animated: true)
        } else {
            let ac = UIAlertController(title: "iOS 13 is required", message: "Custom fonts are only supported by devices running iOS 13 or above.", preferredStyle: .alert)
            ac.addAction(UIAlertAction(title: "OK", style: .default))
            present(ac, animated: true)
        }
    }
}

}

@available(iOS 13.0, *)
extension AppearanceTableViewController: UIFontPickerViewControllerDelegate {
    func fontPickerViewControllerDidPickFont(_ viewController: UIFontPickerViewController) {
        // attempt to read the selected font descriptor, but exit quietly if that fails
        guard let descriptor = viewController.selectedFontDescriptor else { return }

        let font = UIFont(descriptor: descriptor, size: 20)
        UILabel.appearance().substituteFontName = font.fontName
    }
}

extension UILabel {
    @objc public var substituteFontName : String {
        get {
            return self.font.fontName;
        }
        set {
            let fontNameToTest = self.font.fontName.lowercased()
            var fontName = newValue
            if fontNameToTest.range(of: "bold") != nil {
                fontName += "-Bold"
            } else if fontNameToTest.range(of: "medium") != nil {
                fontName += "-Medium"
            } else if fontNameToTest.range(of: "light") != nil {
                fontName += "-Light"
            } else if fontNameToTest.range(of: "ultralight") != nil {
                fontName += "-UltraLight"
            }
            self.font = UIFont(name: fontName, size: self.font.pointSize)
        }
    }
}

使用自定义字体整个iOS应用程序swift

5 个答案: