[英]Value of type 'NSLinguisticTag' has no member 'range'
我有文本方向代码,可以在Swift 3上正常工作,但是在迁移到Swift 4之后,出现了错误
let tagScheme = [NSLinguisticTagScheme.language]
let tagger = NSLinguisticTagger(tagSchemes: tagScheme, options: 0)
tagger.string = self.text
let lang = tagger.tag(at: 0, scheme: NSLinguisticTagScheme.language,
tokenRange: nil, sentenceRange: nil)
if lang?.range(of: "he") != nil || lang?.range(of: "ar") != nil { //Value of type 'NSLinguisticTag' has no member 'range'
self.textAlignment = NSTextAlignment.right
} else {
self.textAlignment = NSTextAlignment.left
}
有人知道怎么修这个东西吗? 谢谢
从Swift 4开始, NSLinguisticTagger
返回的标签不是(可选)字符串,而是NSLinguisticTag
(可选)值:
public struct NSLinguisticTag : RawRepresentable, Equatable, Hashable {
public init(_ rawValue: String)
public init(rawValue: String)
}
您将获得带有rawValue
属性的基础字符串:
if let lang = tagger.tag(at: 0, scheme: .language, tokenRange: nil, sentenceRange: nil) {
print(lang.rawValue)
if lang.rawValue.hasPrefix("he") { ... }
}
如果要检查相等性而不是包含性,则还可以定义自己的NSLinguisticTag
常量:
extension NSLinguisticTag {
static let hebrew = NSLinguisticTag("he")
}
并将它们用作
if let lang = tagger.tag(at: 0, scheme: .language, tokenRange: nil, sentenceRange: nil) {
if lang == .hebrew { ... }
}
另一个选择是定义自定义计算属性
extension NSLinguisticTag {
var isRightToLeft: Bool {
return rawValue.hasPrefix("he") || rawValue.hasPrefix("ar")
}
}
并用作
if let lang = tagger.tag(at: 0, scheme: .language, tokenRange: nil, sentenceRange: nil) {
if lang.isRightToLeft { ... }
}
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