Swift 3 错误 UILabel：不支持将 CGColor 用于颜色属性或内部属性字符串

Question

我的应用程序在尝试创建 NSAttributedString 时崩溃了。我收到错误：

'NSInternalInconsistencyException'，原因：'UILabel: the use of CGColor for color properties or inside attributed strings is not supported.'

这在升级到 Swift 3、Xcode 8

之前没有发生

这是我的代码：

let encodedData = someHtmlString.data(using: String.Encoding.utf8, allowLossyConversion: true)!

let attributedOptions: [String:Any] = [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                                        NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue]

do {
    let attributedString = try NSAttributedString(data: encodedData, options: attributedOptions, documentAttributes: nil)
}

我无法理解 CGColor 与此有什么关系。

编辑：我像这样使用 attributedString：

let label = UILabel()
label.text = attributedString.string

但是这段代码没有执行。应用程序在 'try' 范围内崩溃。

我传入的字符串 (someHtmlString) 有：

<ul>  <li>Up to 2 children 11 years old and younger stay free when occupying the parent or guardian\'s room, using existing bedding. </li><li>Only registered guests are allowed in the guestrooms. </li> <li>The property has connecting/adjoining rooms, which are subject to availability and can be requested by contacting the property using the number on the booking confirmation. </li><li>Some facilities may have restricted access. Guests can contact the property for details using the contact information on the booking confirmation. </li> </ul>

编辑 2 奇怪的事情正在发生。我注释掉了对这段代码的调用，应用程序仍然因同样的错误而崩溃。所以 "All exceptions" 断点将我指向了错误的位置。

编辑 3 请参阅下面我的解决方案

Answer 1

编辑:

勾选Sample

使用

label.attributedText = attributedString

我的输出是您自己的代码，只需使用我上面的行代替您的 label.text = attributedString.string。只需将标签的行保持为 0，并提供引导和跟踪约束。

我的代码

let someHtmlString = "<ul>  <li>Up to 2 children 11 years old and younger stay free when occupying the parent or guardian\'s room, using existing bedding. </li><li>Only registered guests are allowed in the guestrooms. </li> <li>The property has connecting/adjoining rooms, which are subject to availability and can be requested by contacting the property using the number on the booking confirmation. </li><li>Some facilities may have restricted access. Guests can contact the property for details using the contact information on the booking confirmation. </li> </ul>"

let encodedData = someHtmlString.data(using: String.Encoding.utf8, allowLossyConversion: true)!

let attributedOptions: [String:Any] = [
    NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
    NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue            
]

do {
    let attributedString = try NSAttributedString(data: encodedData, options: attributedOptions, documentAttributes: nil)
    myLabel.attributedText = attributedString
    //or use myLabel.text = attributedString.string
} catch {
}

Answer 2

经过一些注释，我发现问题出在这段代码中：

let mutableAttributedStr = NSMutableAttributedString
let textColor = label.textColor
let textRange = NSMakeRange(0, mutableAttributedStr.length)
mutableAttributedStr.addAttributes([NSForegroundColorAttributeName: textColor], range: textRange)

textColor 产生了一个 Optional 类型（有一个值，不是 nil）。一旦我将 ! 添加到下一行，它就起作用了。不知道为什么这突然成为 Swift 3/iOS 10.

中的一个问题

let textColor = label.textColor!

Answer 3

快点！因为我刚刚有错字，所以在颜色属性上添加了 UIFont，例如：

[NSForegroundColorAttributeName: UIFont]

Swift 3 错误 UILabel：不支持将 CGColor 用于颜色属性或内部属性字符串

Swift 3 Error UILabel: the use of CGColor for color properties or inside attributed strings is not supported

nsattributedstring

ios

swift

swift3