无法转换类型 'NSAttributedString.DocumentAttributeKey' 的值，"DocumentReadingOptionKey" 也不起作用

Question

我从 Swift 3 升级到 Swift 4，我收到 NSAttributedString 相关错误。

这是我的代码：

viewModel.getInviteAFriendInfo(success: { message in
    if message.isEmpty{
        self.lblDetail.text = "xxxxxxx"
    }else{
        let htmlString: String = "<html><head><style xxxxxx </style></head><body>\(message)</body></html>"
        self.lblDetail.setText(try! NSAttributedString(data: htmlString.data(using: .unicode, allowLossyConversion: true)!, options: [NSAttributedString.DocumentAttributeKey.documentType:NSAttributedString.DocumentType.html,NSAttributedStringKey.kern: 2.0], documentAttributes: nil))
    }
}, failure: {
    self.showAlert("Failed to get text")
})

这是我的错误：

Cannot convert value of type 'NSAttributedString.DocumentAttributeKey' to expected dictionary key type 'NSAttributedString.DocumentReadingOptionKey'

阅读了一些已发布的问题和解决方案，尝试将 NSAttributedString.DocumentAttributedKey 更改为 NSAttributedString.DocumentReadingOptionKey，但仍然出错。

Answer 1

您尝试传递给 options 参数的值需要拆分。

首先，documentType 来自 NSAttributedString.DocumentReadingOptionKey，而不是 NSAttributedString.DocumentAttributeKey。

其次，kern 需要传递给 documentAttributes 参数，而不是 options 参数。

如果你拆分代码就容易多了:

let options: [NSAttributedString.DocumentReadingOptionKey : Any] = [ .documentType: NSAttributedString.DocumentType.html ]
let attributes = [ NSAttributedString.Key.kern: 2.0 ] as NSDictionary?
let data = htmlString.data(using: .utf8)!
let attrStr = try? NSAttributedString(data: data, options: options, documentAttributes: &attributes)

Answer 2

试试这个

var htmlString: String = "<html><head><style xxxxxx </style></head><body>\(message)</body></html>"

if let attributedString = try? NSAttributedString(data: (htmlString.data(using: .unicode, allowLossyConversion: true)!), options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil) {
    self.lblDetail.attributedText = attributedString
}

无法转换类型 'NSAttributedString.DocumentAttributeKey' 的值，"DocumentReadingOptionKey" 也不起作用

Cannot convert value of type 'NSAttributedString.DocumentAttributeKey' , "DocumentReadingOptionKey" also not working

nsattributedstring

swift

swift4