我使用UIFont在我的應用程序中更改默認字體。該代碼在iOS 10及更低版本上工作正常,但它在iOS 11上返回nil,沒有任何更改。我使用SWIFT 4ios11- UIFont return nil
這是我的代碼,返回nil:
UIFont(name: "AIranianSans", size: 20)
你能幫助我嗎?哪裏不對 ?
我使用UIFont在我的應用程序中更改默認字體。該代碼在iOS 10及更低版本上工作正常,但它在iOS 11上返回nil,沒有任何更改。我使用SWIFT 4ios11- UIFont return nil
這是我的代碼,返回nil:
UIFont(name: "AIranianSans", size: 20)
你能幫助我嗎?哪裏不對 ?
嘗試檢查可用字體
for familyName:String in UIFont.familyNames {
print("Family Name: \(familyName)")
for fontName:String in UIFont.fontNames(forFamilyName: familyName) {
print("--Font Name: \(fontName)")
}
}
可能是字體拼寫是不同的。
https://codewithchris.com/common-mistakes-with-adding-custom-fonts-to-your-ios-app/ 下面的步驟提到這裏後,我無法在運行時在swift4中加載字體。當我們在故事板中應用特定的自定義字體時,字體將出現在運行時。那麼只有這個api
UIFont(name: "font name", size: 20.0)
返回字體實例否則它將只返回nil。 所以設計時自定義字體工作正常,但不是運行
工作運行時,我們需要加載的字體
負荷字體文件多達你喜歡
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)
公共靜態FUNC registerFontWithFilenameString(filenameString:字符串,束:束){
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.")
}