UITextView swift中字符串的粗体部分

Question

正文:

@IBOutlet weak var legalText: UITextView!
let textToAppend = "TERMS OF SERVICEnLast Updated: May 7, 2015nnPLEASE NOTE: The HIGO Terms of Service as stated below is effective as of the 'Last Updated' date above for any user who is browsing the HIGO website, or for any user who creates a HIGO account on or after that date."
legalText.text = legalText.text.stringByAppendingString(textToAppend)

我想加粗"服务条款"one_answers"请注意:以下所述的HIGO服务条款自上述"最后更新"日期起对浏览HIGO网站的任何用户或在该日期或之后创建HIGO帐户的任何用户有效。"

我尝试在uitextview中以编程方式使用uilabel，但没有工作:

var termsofservice : UILabel = UILabel()
termsofservice.numberOfLines = 0
termsofservice.text = "TERMS OF SERVICE"
termsofservice.font = UIFont.boldSystemFontOfSize(20)
termsofservice.textAlignment = NSTextAlignment.Left;
var pleasenote : UILabel = UILabel()
pleasenote.numberOfLines = 0
pleasenote.text = "PLEASE NOTE: The HIGO Terms of Service as stated below is effective as of the 'Last Updated' date above for any user who is browsing the HIGO website, or for any user who creates a HIGO account on or after that date."
pleasenote.font = UIFont.boldSystemFontOfSize(20)
pleasenote.textAlignment = NSTextAlignment.Left;
let textToAppend = "(termsofservice)nLast Updated: May 7, 2015nn(pleasenote)"

也尝试使用这些，但没有工作，它只显示"服务条款"one_answers"上次更新…"，没有显示"请注意…"

var termsofservice = "TERMS OF SERVICE"
var normalText = "nnLast Updated: May 7, 2015"
var pleasenote  = "nnPLEASE NOTE: The HIGO Terms of Service as stated below is effective as of the 'Last Updated' date above for any user who is browsing the HIGO website, or for any user who creates a HIGO account on or after that date."
var attributedString = NSMutableAttributedString(string:normalText)
var attrs = [NSFontAttributeName : UIFont.boldSystemFontOfSize(15)]
var boldString = NSMutableAttributedString(string:pleasenote, attributes:attrs)
var boldString0 = NSMutableAttributedString(string:termsofservice, attributes:attrs)
boldString0.appendAttributedString(attributedString)
attributedString.appendAttributedString(boldString)
legalText.attributedText = boldString0

如何加粗字符串的那一部分?

注意:文本仍然很长，还有更多的字符串部分需要加粗。

Answer 1

已更新为Swift 3

func attributedText() -> NSAttributedString {
    let string = "TERMS OF SERVICEnLast Updated: May 7, 2015nnPLEASE NOTE: The HIGO Terms of Service as stated below is effective as of the 'Last Updated' date above for any user who is browsing the HIGO website, or for any user who creates a HIGO account on or after that date." as NSString
    let attributedString = NSMutableAttributedString(string: string as String, attributes: [NSFontAttributeName:UIFont.systemFont(ofSize: 15.0)])
    let boldFontAttribute = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 15.0)]
    // Part of string to be bold
    attributedString.addAttributes(boldFontAttribute, range: string.range(of: "TERMS OF SERVICE"))
    attributedString.addAttributes(boldFontAttribute, range: string.range(of: "PLEASE NOTE:"))
    // 4
    return attributedString
}

并将属性文本设置为:

legalText.attributedText = attributedText()

Answer 2

更好的是，您可以继续在您的军械库中使用这个1函数，在像Constants.swift这样的文件中，然后您可以在任何字符串中添加单词，在许多场合，只需调用一行代码:

在一个没有类的文件中，就像我的例子中的constants.swift:

import Foundation
import UIKit
func addBoldText(fullString: NSString, boldPartOfString: NSString, font: UIFont!, boldFont: UIFont!) -> NSAttributedString {
    let nonBoldFontAttribute = [NSAttributedString.Key.font:font!]
    let boldFontAttribute = [NSAttributedString.Key.font:boldFont!]
    let boldString = NSMutableAttributedString(string: fullString as String, attributes:nonBoldFontAttribute)
    boldString.addAttributes(boldFontAttribute, range: fullString.range(of: boldPartOfString as String))
    return boldString
}

然后你可以调用这一行代码为任何UILabel:

let normalFont = UIFont(name: "INSERT FONT NAME", size: 14)
let boldFont = UIFont(name: "INSERT BOLD FONT NAME", size: 14)
self.UILabel.attributedText = addBoldText("Check again in 30 DAYS to find more friends", boldPartOfString: "30 DAYS", font: normalFont!, boldFont: boldFont!)

Answer 3

4.2迅速更新

func addBoldText(fullString: String, boldPartOfString: String, baseFont: UIFont, boldFont: UIFont) -> NSAttributedString {
    //1
    let baseFontAttribute = [NSAttributedString.Key.font : baseFont]
    let boldFontAttribute = [NSAttributedString.Key.font : boldFont]
    //2
    let attributedString = NSMutableAttributedString(string: fullString, attributes: baseFontAttribute)
    //3. Note if 'boldPartOfString' is not a substring of 'fullString', enitre 'fullString' will be formatted with 'boldFont'
    attributedString.addAttributes(boldFontAttribute, range: NSRange(fullString.range(of: boldPartOfString) ?? fullString.startIndex..<fullString.endIndex, in: fullString))
    //4
    return attributedString
}

Answer 4

Swift 3 Update(来自@Hamza Ansari的回答)

func attributedText()-> NSAttributedString
{
    let string = "TERMS OF SERVICEnLast Updated: May 7, 2015nnPLEASE NOTE: The HIGO Terms of Service as stated below is effective as of the 'Last Updated' date above for any user who is browsing the HIGO website, or for any user who creates a HIGO account on or after that date." as NSString
    let attributedString = NSMutableAttributedString(string: string as String, attributes: [NSFontAttributeName:UIFont.systemFont(ofSize: 15.0)])
    let boldFontAttribute = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 15.0)]
    // Part of string to be bold
    attributedString.addAttributes(boldFontAttribute, range: string.range(of: "TERMS OF SERVICE"))
    attributedString.addAttributes(boldFontAttribute, range: string.range(of: "PLEASE NOTE:"))
    // 4
    return attributedString
}