Question

我按照following post关于如何使用NSTextAttachment添加与UILabel内联的图像。我尽力而为，并在Swift中编写了我的版本。

我正在创建一个聊天应用程序，我插入啤酒图标的字段不会渲染图像，或者似乎没有内嵌渲染图像。我没有收到任何错误，因此我假设我在代码中遗漏了一些小细节。

var beerName:String!

        if(sender == bn_beer1)
        {
            beerName = "beer1.png"
        }

        if(sender == bn_beer2)
        {
            beerName = "beer2.png"
        }

        if(sender == bn_beer3)
        {
            beerName = "beer3"
        }



        var attachment:NSTextAttachment = NSTextAttachment()
        attachment.image = UIImage(named: beerName)


        var attachmentString:NSAttributedString = NSAttributedString(attachment: attachment)
        var myString:NSMutableAttributedString = NSMutableAttributedString(string: inputField.text)
        myString.appendAttributedString(attachmentString)



        inputField.attributedText = myString;

Answer 1

这对UITextField不起作用。它只适用于UILabel。

这是基于您的代码（Swift 2.0）的UILabel扩展

extension UILabel
{
    func addImage(imageName: String)
    {
        let attachment:NSTextAttachment = NSTextAttachment()
        attachment.image = UIImage(named: imageName)

        let attachmentString:NSAttributedString = NSAttributedString(attachment: attachment)
        let myString:NSMutableAttributedString = NSMutableAttributedString(string: self.text!)
        myString.appendAttributedString(attachmentString)

        self.attributedText = myString
    }
}

编辑：

这是一个新版本，允许在标签之前或之后添加图标。还有一个从标签

中删除图标的功能

extension UILabel
{
    func addImage(imageName: String, afterLabel bolAfterLabel: Bool = false)
    {
        let attachment: NSTextAttachment = NSTextAttachment()
        attachment.image = UIImage(named: imageName)
        let attachmentString: NSAttributedString = NSAttributedString(attachment: attachment)

        if (bolAfterLabel)
        {
            let strLabelText: NSMutableAttributedString = NSMutableAttributedString(string: self.text!)
            strLabelText.appendAttributedString(attachmentString)

            self.attributedText = strLabelText
        }
        else
        {
            let strLabelText: NSAttributedString = NSAttributedString(string: self.text!)
            let mutableAttachmentString: NSMutableAttributedString = NSMutableAttributedString(attributedString: attachmentString)
            mutableAttachmentString.appendAttributedString(strLabelText)

            self.attributedText = mutableAttachmentString
        }
    }

    func removeImage()
    {
        let text = self.text
        self.attributedText = nil
        self.text = text
    }
}

Answer 2

Regis St-Gelais对 Swift 3 和 Swift 4 的扩展答案，并且没有强制解包：

protected $redirectTo = '/mypath/to/page'; (here placed '/home')

用法：

extension UILabel {

    func addImageWith(name: String, behindText: Bool) {

        let attachment = NSTextAttachment()
        attachment.image = UIImage(named: name)
        let attachmentString = NSAttributedString(attachment: attachment)

        guard let txt = self.text else {
            return
        }

        if behindText {
            let strLabelText = NSMutableAttributedString(string: txt)
            strLabelText.append(attachmentString)
            self.attributedText = strLabelText
        } else {
            let strLabelText = NSAttributedString(string: txt)
            let mutableAttachmentString = NSMutableAttributedString(attributedString: attachmentString)
            mutableAttachmentString.append(strLabelText)
            self.attributedText = mutableAttachmentString
        }
    }

    func removeImage() {
        let text = self.text
        self.attributedText = nil
        self.text = text
    }
}

Answer 3

编辑19/03/18：更正imageBehindText = false时的错误+像素中的图像大小无点。

大卫的多功能图像功能更新，文本保存和基于字体大小的图像大小（Swift 4）：

extension UILabel {
    /**
     This function adding image with text on label.

     - parameter text: The text to add
     - parameter image: The image to add
     - parameter imageBehindText: A boolean value that indicate if the imaga is behind text or not
     - parameter keepPreviousText: A boolean value that indicate if the function keep the actual text or not
     */
    func addTextWithImage(text: String, image: UIImage, imageBehindText: Bool, keepPreviousText: Bool) {
                    let lAttachment = NSTextAttachment()
        lAttachment.image = image

        // 1pt = 1.32px
        let lFontSize = round(self.font.pointSize * 1.32)
        let lRatio = image.size.width / image.size.height

        lAttachment.bounds = CGRect(x: 0, y: ((self.font.capHeight - lFontSize) / 2).rounded(), width: lRatio * lFontSize, height: lFontSize)

        let lAttachmentString = NSAttributedString(attachment: lAttachment)

        if imageBehindText {
            let lStrLabelText: NSMutableAttributedString

            if keepPreviousText, let lCurrentAttributedString = self.attributedText {
                lStrLabelText = NSMutableAttributedString(attributedString: lCurrentAttributedString)
                lStrLabelText.append(NSMutableAttributedString(string: text))
            } else {
                lStrLabelText = NSMutableAttributedString(string: text)
            }

            lStrLabelText.append(lAttachmentString)
            self.attributedText = lStrLabelText
        } else {
            let lStrLabelText: NSMutableAttributedString

            if keepPreviousText, let lCurrentAttributedString = self.attributedText {
                lStrLabelText = NSMutableAttributedString(attributedString: lCurrentAttributedString)
                lStrLabelText.append(NSMutableAttributedString(attributedString: lAttachmentString))
                lStrLabelText.append(NSMutableAttributedString(string: text))
            } else {
                lStrLabelText = NSMutableAttributedString(attributedString: lAttachmentString)
                lStrLabelText.append(NSMutableAttributedString(string: text))
            }

            self.attributedText = lStrLabelText
        }
    }

    func removeImage() {
        let text = self.text
        self.attributedText = nil
        self.text = text
    }
}

Answer 4

使用以下扩展名可以肯定起作用

 extension NSMutableAttributedString { 
   static func addImageInBetweenString(firstSentence: String, image: UIImage?, lastSentence: String) -> NSMutableAttributedString {
     // create an NSMutableAttributedString that we'll append everything to
     let fullString = NSMutableAttributedString(string: firstSentence)

     // create our NSTextAttachment
     let image1Attachment = NSTextAttachment()
     image1Attachment.image = image
     //image1Attachment.setImageHeight(height: 15.0)
     Image1Attachment.bounds = CGRect(x: 0, y: -5, width: 15, height: 15)

     // wrap the attachment in its own attributed string so we can append it
     let image1String = NSAttributedString(attachment: image1Attachment)

    // add the NSTextAttachment wrapper to our full string, then add some more text.
    fullString.append(image1String)
    fullString.append(NSAttributedString(string: lastSentence))

    return fullString
   }
} 



extension NSTextAttachment {
   func setImageHeight(height: CGFloat) {
      guard let image = image else { return }
      let ratio = image.size.width / image.size.height
      bounds = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: ratio * height, height: height)
  }
 }

如何使用swift在iOS 8中插入图像内联UILabel

4 个答案: