Swift UIText View replaceCharacters Out of bounds答案

【问题标题】：Swift UIText View replaceCharacters Out of boundsSwift UIText View replaceCharacters Out of bounds
【发布时间】：2018-07-09 09:01:41
【问题描述】：

我尝试替换图片链接并在 TextView 上显示

这是我的代码

class ViewController: UIViewController {

    let textView: UITextView = {
        let view = UITextView()
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(textView)
        textView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        textView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        textView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        textView.topAnchor.constraint(equalTo: view.topAnchor, constant: 50).isActive = true
        let input = "New iPhone \nhttp://cdn2.gsmarena.com/vv/bigpic/apple-iphone-6s1.jpg \nTest Test Test"
        imageText(text: input)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func imageText(text:String) {
        let attributedString = NSMutableAttributedString(string: text)
        let detector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
        let matches = detector?.matches(in: text, options: .reportCompletion, range:NSRange(location: 0, length: text.count))
        for match in matches! {
            if match.url?.absoluteString.suffix(3) == "jpg" {
                let textAttachment = NSTextAttachment()
                let data = NSData(contentsOf: (match.url!))
                if data != nil{
                    let image = UIImage(data: data! as Data)
                    textAttachment.image = image
                    let attributedStringWithImage = NSAttributedString(attachment: textAttachment)
                    attributedString.replaceCharacters(in: (match.range), with: attributedStringWithImage)
                }
            }
        }
        textView.attributedText = attributedString
    }
}

有效：

App Screen Shot

但如果我添加第二个链接，它就会崩溃。

let input = "New iPhone \nhttp://cdn2.gsmarena.com/vv/bigpic/apple-iphone-6s1.jpg \nTest Test Test \nhttp://cdn2.gsmarena.com/vv/bigpic/apple-iphone-6s1.jpg \nTest Test Test"

控制台

reason: 'NSMutableRLEArray replaceObjectsInRange:withObject:length:: Out of bounds'

我发现崩溃点是这一行

attributedString.replaceCharacters(in: (match.range), with: attributedStringWithImage)

如何解决这个问题？

【问题讨论】：

你需要倒着做。因为如果您更改第一个，那么您的字符串的长度会更小，因为您将长链接更改为小文本附件。忘记图像，假设您将每个链接替换为“Hello”，您就明白了。现在，修复它：for match in matches! => for match in matches!.reversed()
感谢您的回答它有效

标签： swift uitextview nsattributedstring

【解决方案1】：

问题是：你在这一行中改变了attributedString

attributedString.replaceCharacters(in: (match.range), with: attributedStringWithImage)

因此，在for 循环的以下迭代中，您尝试替换的范围不再存在。

【讨论】：