表达式过于复杂，无法在合理时间内解决；考虑将表达式分解为不同的子表达式？

Question

    let attrStr = try! NSAttributedString(
        data: "Your baby in week three\n" +
            "Three weeks into your pregnancy, and you might be wondering just how this little miracle occurred (as in the science bit we will assume you know the other part!). \n" +
            "\n" +
            "So here goes: the joining of your partner's sperm and your egg at the moment of conception resulted in a ball of cells (or a blastocyst, if you want to get really technical) which is now starting the 6 day journey from the fallopian tube to the uterus where it will attach itself to the lining of your womb and in nine months time, will result in a real live baby in your arms! \n" +
            "\n" +
            "Amazingly, although you will not know for a few months (or until the birth) the <b><font color=#00690c >sex of your baby</font></b> has already been determined. The fertilised egg contains <b><font color=#e3007b>46</font></b> chromosomes with <b><font color=#e3007b>23</font></b> from you and <b><font color=#e3007b>23</font></b> from the dad. You as mum will always provide the <b><font color=#e3007b>X</font></b> chromosome but the dad can provide an <b><font color=#e3007b>X</font></b> or <b><font color=#e3007b>Y</font></b> chromosome. <b><font color=#e3007b>XX</font></b> and you will be having a girl, <b><font color=#e3007b>XY</font></b> and you will have a little boy in 9 months time!".dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)!,
        options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
        documentAttributes: nil)
    trimestercontent.attributedText = attrStr

使用“+”运算符连接字符串的标题出现错误。 有什么方法可以解决这个问题，因为我有一个带有“+”运算符的批量数据来连接字符串。 请帮忙

Answer 1

只需在调用NSAttributedString的init方法之前创建文字字符串

let string = "Your baby in week three<br>" +
    "Three weeks into your pregnancy, and you might be wondering just how this little miracle occurred (as in the science bit we will assume you know the other part!). <br>" +
    "<br>" +
    "So here goes: the joining of your partner's sperm and your egg at the moment of conception resulted in a ball of cells (or a blastocyst, if you want to get really technical) which is now starting the 6 day journey from the fallopian tube to the uterus where it will attach itself to the lining of your womb and in nine months time, will result in a real live baby in your arms! <br>" +
    "<br>" +
"Amazingly, although you will not know for a few months (or until the birth) the <b><font color=#00690c >sex of your baby</font></b> has already been determined. The fertilised egg contains <b><font color=#e3007b>46</font></b> chromosomes with <b><font color=#e3007b>23</font></b> from you and <b><font color=#e3007b>23</font></b> from the dad. You as mum will always provide the <b><font color=#e3007b>X</font></b> chromosome but the dad can provide an <b><font color=#e3007b>X</font></b> or <b><font color=#e3007b>Y</font></b> chromosome. <b><font color=#e3007b>XX</font></b> and you will be having a girl, <b><font color=#e3007b>XY</font></b> and you will have a little boy in 9 months time!"

let attrStr = try! NSAttributedString(
    data: string.dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)!,
    options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)

Answer 2

将你的字符串拆分为一些字符串，然后更改为 Swift 3.0 API

    let a = "Your baby in week three\nThree weeks into your pregnancy, and you might be wondering just how this little miracle occurred (as in the science bit we will assume you know the other part!). \n\n"
    let b = "So here goes: the joining of your partner's sperm and your egg at the moment of conception resulted in a ball of cells (or a blastocyst, if you want to get really technical) which is now starting the 6 day journey from the fallopian tube to the uterus where it will attach itself to the lining of your womb and in nine months time, will result in a real live baby in your arms! \n" +
    "\n"
    let c = "Amazingly, although you will not know for a few months (or until the birth) the <b><font color=#00690c >sex of your baby</font></b> has already been determined. The fertilised egg contains <b><font color=#e3007b>46</font></b> chromosomes with <b><font color=#e3007b>23</font></b> from you and <b><font color=#e3007b>23</font></b> from the dad. You as mum will always provide the <b><font color=#e3007b>X</font></b> chromosome but the dad can provide an <b><font color=#e3007b>X</font></b> or <b><font color=#e3007b>Y</font></b> chromosome. <b><font color=#e3007b>XX</font></b> and you will be having a girl, <b><font color=#e3007b>XY</font></b> and you will have a little boy in 9 months time!"
    let d = a+b+c

    let attrStr = try! NSAttributedString.init(data: d.data(using: String.Encoding.unicode, allowLossyConversion:true)!, options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)

    trimestercontent.attributedText = attrStr

Answer 3

您可以使用耦合更少且对编译器更友好的表达式

let dataStr: String = [
    "Your baby in week three",
    "Three weeks into your pregnancy, and you might be wondering just how this little miracle occurred (as in the science bit we will assume you know the other part!). \n",
    "So here goes: the joining of your partner's sperm and your egg at the moment of conception resulted in a ball of cells (or a blastocyst, if you want to get really technical) which is now starting the 6 day journey from the fallopian tube to the uterus where it will attach itself to the lining of your womb and in nine months time, will result in a real live baby in your arms!",
    "Amazingly, although you will not know for a few months (or until the birth) the <b><font color=#00690c >sex of your baby</font></b> has already been determined. The fertilised egg contains <b><font color=#e3007b>46</font></b> chromosomes with <b><font color=#e3007b>23</font></b> from you and <b><font color=#e3007b>23</font></b> from the dad. You as mum will always provide the <b><font color=#e3007b>X</font></b> chromosome but the dad can provide an <b><font color=#e3007b>X</font></b> or <b><font color=#e3007b>Y</font></b> chromosome. <b><font color=#e3007b>XX</font></b> and you will be having a girl, <b><font color=#e3007b>XY</font></b> and you will have a little boy in 9 months time!"
].joined(separator: "\n")