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。