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索引1超出界限[0。。0]创建NSAttributedString时

swift ios

BartÅomiej SemaÅczyk · 技术社区 · 6 年前

在我的代码中有一个扩展名 NSAttributedString

internal convenience init?(html: String) {
    guard let data = html.data(using: String.Encoding.utf8, allowLossyConversion: true) else {
        return nil
    }
    print(UIKit.Thread.isMainThread) //TRUE
    guard let attributedString = try? NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil) else { //here is the error
        return nil
    }
    self.init(attributedString: attributedString)
}

然后我试着这样使用它:

let text = "<p>Your order has been created.Â </p><p>Below You can find the details of Your order:</p><p>Order ID: 183</p><p>Summary: <ul><li>Filtered coffee 50.00 x 1</li></ul></p><p>Service fee: 30.0</p><p>Total: 80.0 Kn</p><p>You will receive a message when our staff starts preparing Your order.<br/></p>"

let attributedString = NSAttributedString(html: text)

Your order has been created.Â

Below You can find the details of Your order:

Order ID: 183

Summary:

过滤咖啡50.00 x 1

服务费:30.0

当我们的工作人员开始准备您的订单时,您将收到一条消息。

怎么了?;)

extension Message: MessageType {
var sender: Sender {
    return Sender(id: createdBy?.identifier ?? "", displayName: createdBy?.name ?? "BOT_RESPONSE")
}
var messageId: String {
    return identifier
}
var sentDate: Date {
    return date
}
var kind: MessageKind {
    guard let attributedString = NSAttributedString(html: text) else {
        return .text(text)
    }
    return .attributedText(attributedString)
}
}

当我将断点放在出现错误的行并在控制台上打印时:

po NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)

2 回复 | 直到 6 年前

ielyamani 6 年前

此分机打开 NSAttributedString 为我工作字符串编码. :

extension NSAttributedString {
    convenience init?(html: String) {
        guard let data = html.data(using: String.Encoding.utf16, allowLossyConversion: false) else {
            return nil
        }

        guard let attributedString = try?  NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil) else {
            return nil
        }

        self.init(attributedString: attributedString)
    }
}

let text = "<p>Your order has been created. </p><p>Below You can find the details of Your order:</p><p>Order ID: 183</p><p>Summary: <ul><li>Filtered coffee 50.00 x 1</li></ul></p><p>Service fee: 30.0</p><p>Total: 80.0 Kn</p><p>You will receive a message when our staff starts preparing Your order.<br/></p>"

let attributedString = NSAttributedString(html: text)
print(attributedString ?? "Nothing")

这是我在操场上用的一根绳子的延伸部分(从这里移植到斯威夫特4号) answer .):

import Foundation
import UIKit
import PlaygroundSupport

let label = UILabel()

extension String {
    func initFrom(html: String, with completionHandler: @escaping (NSAttributedString?) ->()) {
        guard let data = html.data(using: String.Encoding.utf8, allowLossyConversion: true) else {
            return completionHandler(nil)
        }

        let options: [NSAttributedString.DocumentReadingOptionKey : Any] = [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue]

        DispatchQueue.main.async {
            if let attributedString =
                try? NSAttributedString(data: data, options: options, documentAttributes: nil)
            {
                completionHandler(attributedString)
            } else {
                completionHandler(nil)
            }
        }
    }
}

let text = "<p>Your order has been created. </p><p>Below You can find the details of Your order:</p><p>Order ID: 183</p><p>Summary: <ul><li>Filtered coffee 50.00 x 1</li></ul></p><p>Service fee: 30.0</p><p>Total: 80.0 Kn</p><p>You will receive a message when our staff starts preparing Your order.<br/></p>"

text.initFrom(html: text, with: { attString in
    print("attString =", attString ?? "")
    label.attributedText = attString
})

PlaygroundPage.current.needsIndefiniteExecution = true

Mohammed Abdullatif 6 年前

我以前也遇到过类似的问题,我发现我在后台线程上运行我的逻辑。在我创建新的 NSAttributedString 实例,类似于您的行 let attributedString = try? NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil) . 你能确保你正在创建 NSAttributedString

在 NSAttributedString documentation 有人说“不应该从后台线程调用HTML导入程序(即,options dictionary包含值为HTML的documentType)”,所以这可能会指导您解决问题。