iOS 图文混排

• 创建label

let label = UILabel(frame:CGRect(origin: .zero, size:CGSize(width:265, height:40)))
label.numberOfLines = 0

• 创建富文本

let attStr = NSMutableAttributedString(string: "xxxx")

• 创建图片文本

let textAttach = NSTextAttachment()

• 富文本添加图片

textAttach.image = UIImage(named:"lottery_alert_warning")
textAttach.bounds = CGRect(origin: .zero, size:CGSize(width:14, height:14))

• 图片和文字居中对齐

let font = UIFont.systemFont(ofSize:14)
let paddingTop = font.lineHeight-font.pointSize
textAttach.bounds = CGRect(x:0, y: -paddingTop, width: font.lineHeight, height: font.lineHeight)

• 图片文本加入富文本中

let imageAtt = NSAttributedString(attachment: textAttach)

• 图片插入文本中位置

attStr.insert(imageAtt, at:0)

• 一些其他设置

let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 2
paragraphStyle.alignment =  .justified
let attrkey = [NSAttributedString.Key.font:font,
NSAttributedString.Key.foregroundColor:UIColor(hex:"333333"),
NSAttributedString.Key.paragraphStyle:paragraphStyle]
attStr.addAttributes(attrkey, range:NSRange(location:0, length: attStr.string.count))

• 富文本赋值给label

label.attributedText = attStr