NSAttribute 不会使 Bold Swift 变得粗体

Question

我正在尝试使用boldFullName 函数将全名设为粗体。但显然，它并没有对其做出任何改变。我相信转换为字符串正在删除 mutableString 功能。我怎样才能在不返回 NSAttributedString 的情况下避免它

class NewNotificationModel: Serializable {
var fromUser: NewNotificationFromUserModel!
 }

class NewNotificationFromUserModel: Serializable {
var name: String!
var lastName: String!
}

final class NewNotificationViewModel {

// MARK: Properties
var notificationModel: NewNotificationModel!

private(set) var fullName: String!
 init(notificationModel: NewNotificationModel) {
    self.notificationModel = notificationModel
    self.fullName = boldFullName(getFullName())

 private func getFullName() -> String {
    guard let fromUser = notificationModel.fromUser, let name = fromUser.name, let lastname = fromUser.lastName else { return "" }
    return name + " " + lastname
}

func boldFullName(_ fullname: String) -> String {
    let range = NSMakeRange(0, getFullName().count)
    let nonBoldFontAttribute = [NSAttributedString.Key.font:UIFont.sfProTextSemibold(size: 16)]
    let boldFontAttribute = [NSAttributedString.Key.font:UIFont.catamaranBold(size: 20)]
    let boldString = NSMutableAttributedString(string: getFullName() as String, attributes:nonBoldFontAttribute)
        boldString.addAttributes(boldFontAttribute, range: range)
    return boldString.mutableString as String
}
}

并且我在表格单元格中使用这个全名，如下所示

class NewNotificationTableViewCell: UITableViewCell, Reusable, NibLoadable {
@IBOutlet weak var messageLbl: UILabel!
 messageLbl.text = NewNotificationTableViewCell.configureText(model: model)

我的 configureText 函数是

private static func configureText(model: NewNotificationViewModel) -> String {
    guard let type = model.type else { return "" }
    switch NotificationType.init(rawValue: type) {
    String(format:"new_notification.group.request.want.join.text_%@_%@".localized, model.fullName, model.groupName ?? "")
    case .mention?: return String(format:"new_notification.post.mention_%@".localized, model.fullName)

但是那些 .fullName 对加粗 fullName 没有任何作用。

编辑为 NSAttributedString 但这会导致

 case .internalCommunicationMessage?: return NSAttributedString(format:("new_notification.announcement.text_%@".localized), args: NSAttributedString(string: model.groupName ?? ""))

此扩展出错。

public extension NSAttributedString {
convenience init(format: NSAttributedString, args: NSAttributedString...) {
    let mutableNSAttributedString = NSMutableAttributedString(attributedString: format)

    args.forEach { (attributedString) in
        let range = NSString(string: mutableNSAttributedString.string).range(of: "%@")
        mutableNSAttributedString.replaceCharacters(in: range, with: attributedString)
    }
    self.init(attributedString: mutableNSAttributedString)
}

无法

将类型“String”的值转换为预期的参数类型“NSAttributedString”

Answer 1

主要问题是您试图将 attributedString 赋予 text 属性，这不会影响 UILabel 。您必须将代码的某些部分更改为 :

private(set) var fullName: String!

到 :

private(set) var fullName: NSMutableAttributedString!

和

func boldFullName(_ fullname: String) -> String {
let range = NSMakeRange(0, getFullName().count)
let nonBoldFontAttribute = [NSAttributedString.Key.font:UIFont.sfProTextSemibold(size: 16)]
let boldFontAttribute = [NSAttributedString.Key.font:UIFont.catamaranBold(size: 20)]
let boldString = NSMutableAttributedString(string: getFullName() as String, attributes:nonBoldFontAttribute)
    boldString.addAttributes(boldFontAttribute, range: range)
return boldString.mutableString as String
}

to:

 func boldFullName(_ fullname: String) -> NSMutableAttributedString {
let range = NSMakeRange(0, getFullName().count)
let nonBoldFontAttribute = [NSAttributedString.Key.font:UIFont.systemFont(ofSize: 10)]
let boldFontAttribute = [NSAttributedString.Key.font:UIFont.systemFont(ofSize: 30)]
let boldString = NSMutableAttributedString(string: getFullName() as String, attributes:nonBoldFontAttribute)
    boldString.addAttributes(boldFontAttribute, range: range)
return boldString
}

最后当您调用时使用 attributedText 而不是 string

 messageLbl.attributedText = ...

Answer 2

使用此扩展，

 convenience init(format: NSAttributedString, args: NSAttributedString...) {
    let mutableNSAttributedString = NSMutableAttributedString(attributedString: format)
    
    args.forEach { (attributedString) in
        let range = NSString(string: mutableNSAttributedString.string).range(of: "%@")
        mutableNSAttributedString.replaceCharacters(in: range, with: attributedString)
    }
    self.init(attributedString: mutableNSAttributedString)
}

我修改了我的开关案例，如下所示，

 case .internalCommunicationMessage?:
        let content = NSAttributedString(string:"new_notification.announcement.text_%@".localized)
        let gn = NSAttributedString(string: model.groupName ?? "", attributes: [.font: UIFont.sfProTextMedium(size: size),
                                                                                .kern: -0.26])
        return NSAttributedString(format: content, args: gn)

更改了configureText的返回类型

configureText(model: NewNotificationViewModel) -> NSAttributedString

，删除了boldFullName函数，并将fullName类型更改回String

，最后插入到标签中，如下所示。

messageLbl.attributedText = NewNotificationTableViewCell.configureText(model: model)

Answer 3

字符串不包含属性，您确实需要从函数返回一个 NSAttributedString 。

您可以做的是将属性字符串分配给UILabel的attributedText属性。文档此处

示例（更新函数以返回 NSAttributedString):

messageLbl.attributedText = NewNotificationTableViewCell.configureText(model: model)

Answer 4

您需要分配 messageLbl.attributedText

func boldFullName(_ fullname: String) -> NSAttributedString {
    let range = NSMakeRange(0, getFullName().count)
    let nonBoldFontAttribute = [NSAttributedString.Key.font:UIFont.sfProTextSemibold(size: 16)]
    let boldFontAttribute = [NSAttributedString.Key.font:UIFont.catamaranBold(size: 20)]
    let boldString = NSMutableAttributedString(string: getFullName() as String, attributes:nonBoldFontAttribute)
        boldString.addAttributes(boldFontAttribute, range: range)
    return boldString.mutableString
}