Tips-富文本

NSTextAttachment

富文本插入图片并居中

func textAttachment(fontSize: CGFloat) -> NSTextAttachment {
    let font = UIFont.systemFontOfSize(fontSize) //set accordingly to your font, you might pass it in the function
    let textAttachment = NSTextAttachment()
    let image = //some image
    textAttachment.image = image
    let mid = font.descender + font.capHeight
    textAttachment.bounds = CGRectIntegral(CGRect(x: 0, y: font.descender - image.size.height / 2 + mid + 2, width: image.size.width, height: image.size.height))
    return textAttachment
}