我将使用UIFont来更改我的应用程序中的默认字体。这段代码在iOS 10及以下版本上运行良好,但在iOS 11上返回nil,没有任何变化。我使用Swift 4。
这是返回nil的代码:
UIFont(name: "AIranianSans", size: 20)
你能帮我吗?出了什么问题?
尝试检查可用字体
for familyName:String in UIFont.familyNames {
print("Family Name: \(familyName)")
for fontName:String in UIFont.fontNames(forFamilyName: familyName) {
print("--Font Name: \(fontName)")
}
}
可能字体拼写不同。
https://codewithchris.com/common-mistakes-with-adding-custom-fonts-to-your-ios-app/ 按照这里提到的步骤后,我无法在Swift4应用程序中运行时加载字体。只有当我们在故事板中应用特定的自定义字体时,字体才会在运行时出现。然后才能使用此API。
UIFont(name: "font name", size: 20.0)
如果不返回字体实例,则只会返回 nil。因此,设计时自定义字体可以正常工作,但是运行时不行。
为了在运行时工作,我们需要加载字体。
可以加载任意数量的字体文件。
UIFont.registerFontWithFilenameString(filenameString: "font 1 Sans LF Bold.ttf", bundle: Bundle.main)
UIFont.registerFontWithFilenameString(filenameString: "font 2Sans LF Light.ttf", bundle: Bundle.main)
UIFont.registerFontWithFilenameString(filenameString: "font 3Sans LF Regular.ttf", bundle: Bundle.main)
UIFont.registerFontWithFilenameString(filenameString: "font 4Sans LF Medium.ttf", bundle: Bundle.main)
公共静态函数使用文件名字符串注册字体(filenameString: String, bundle: Bundle) {
guard let pathForResourceString = bundle.path(forResource: filenameString, ofType: nil) else {
print("UIFont+: Failed to register font - path for resource not found.")
return
}
guard let fontData = NSData(contentsOfFile: pathForResourceString) else {
print("UIFont+: Failed to register font - font data could not be loaded.")
return
}
guard let dataProvider = CGDataProvider(data: fontData) else {
print("UIFont+: Failed to register font - data provider could not be loaded.")
return
}
guard let fontRef = CGFont(dataProvider) else {
print("UIFont+: Failed to register font - font could not be loaded.")
return
}
var errorRef: Unmanaged<CFError>? = nil
if (CTFontManagerRegisterGraphicsFont(fontRef, &errorRef) == false) {
print("UIFont+: Failed to register font - register graphics font failed - this font may have already been registered in the main bundle.")
}
代码被占用 Xcode:在动态框架内使用自定义字体