swift - 如何使用 swift 在 iOS 8 中插入图像 Inline UILabel

Question

我关注了 following post关于如何使用 NSTextAttachment 添加与 UILabel 内联的图像。我尽我所能，用 Swift 编写了我的版本。

我正在创建一个聊天应用程序，但我要插入啤酒图标的字段不呈现图像或似乎不呈现内联图像。我没有收到任何错误，所以我假设我的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

这不适用于 UITextField。它仅适用于 UILabel。

这是一个基于您的代码的 UILabel 扩展 (Swift 2.0)

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:

这是一个允许在标签之前或之后添加图标的新版本。还有一个功能是把图标从标签中去掉

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
    }
}