发布于 5年前
Cannot convert value of type 'NSAttributedString.DocumentAttributeKey' to expected dictionary key type 'NSAttributedString.DocumentReadingOptionKey'
Swift 3切换为Swift 4，原来用于转换html为NSAttributedString的代码报错：
Cannot convert value of type 'NSAttributedString.DocumentAttributeKey' to expected dictionary key type 'NSAttributedString.DocumentReadingOptionKey'
Swift 3代码：
func html2AttributedString() -> NSAttributedString {
return try! NSAttributedString(
data: self.data(using: String.Encoding.unicode, allowLossyConversion: true)!,
options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
documentAttributes: nil)
}
在Swift 4转换为NSAttributedString需要使用DocumentType选项：
- doc：NSAttributedString.DocumentType.docFormat
- html：NSAttributedString.DocumentType.html
- plain文本：NSAttributedString.DocumentType.plain
- 富文本：NSAttributedString.DocumentType.rtf
- 带有附件的富文本：NSAttributedString.DocumentType.rtfd
所以Swift4对应的代码为：
func html2AttributedString() -> NSAttributedString {
return try! NSAttributedString(
data: modifiedFont.data(using: .unicode, allowLossyConversion: true)!,
options:[.documentType: NSAttributedString.DocumentType.html,
.characterEncoding: String.Encoding.utf8.rawValue],
documentAttributes: nil)
}
需要加上
.characterEncoding: String.Encoding.utf8.rawValue
否则可能会导致app崩溃。
