swift 3如何在tableView中更改標題標題部分的顏色？

Question

我讀過類似的問題，但是我沒有答案：我有帶標題的表格視圖，第一個有標題和數字，我想在表格視圖的標題中更改該數字的顏色，這是我的代碼：

var headerList = ["Account" , "Help" , "" ]

override func viewDidLoad() {
         super.viewDidLoad()
self.headerList[0] = "Account \(userAccountMoney)"

 }
  override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {

    let returnedView = UIView(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 25))
    returnedView.backgroundColor = UIColor.init(red: 229/255, green: 233/255, blue: 236/255, alpha: 1.0)

    let label = UILabel(frame: CGRect(x: -20, y: 7, width: view.frame.size.width, height: 25))
    label.text = self.headerList[section]
    label.textAlignment = .right
    label.textColor = .lightGray
 }

正如您在我的代碼中看到的標題標題為灰色，但我想在第一個標題標題中，帳戶字詞仍為灰色，但userAccountMoney為綠色，問題在於，因為userAccountMoney是另一個變量，我無法使用類似的問題

Answer 1

如果要更改字符串部分的顏色，則需要使用NS(Mutable)AttributedString並將color屬性僅添加到特定范圍：

if section == 0 {
    let sectionTitle = self.headerList[0]
    let attributedString = NSMutableAttributedString(string: sectionTitle)
    if sectionTitle.characters.count > 8 {
        attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSRange(location: 8, length: sectionTitle.characters.count - 8))
    }
    label.attributedText = attributedString
} else {
    label.text = self.headerList[section]
}

索引8是"Account "之后的硬編碼索引

---

但是，根據您的情況，我建議將headerList創建為常量

let headerList = ["" , "Help" , "" ]

然后刪除viewDidLoad的代碼，並使用此代碼動態創建帳戶金額

if section == 0 {
    let attributedString = NSMutableAttributedString(string: "Account ")
    attributedString.append(NSAttributedString(string: "\(userAccountMoney)", attributes: [NSForegroundColorAttributeName : UIColor.red]))
    label.attributedText = attributedString
} else {
    label.text = self.headerList[section]
}

Answer 2

使用NSAttributedString，您可以創建兩個多色文本，甚至可以更改字體。 這是代碼段：

let titleAtt = NSAttributedString(string: "Hello", attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 18.0)!, NSForegroundColorAttributeName: UIColor.blue])
let numberAtt = NSAttributedString(string: "123", attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 18.0)!, NSForegroundColorAttributeName: UIColor.red])

let combinationAtt = NSMutableAttributedString() 
combinationAtt.append(titleAtt)
combinationAtt.append(numberAtt)
label.attributedText = combinationAtt

Answer 3

我可能無法完全理解您的問題，但我想您要為第一個tableview標頭設置不同的顏色。 您想通過對section變量使用If-else語句來做到這一點。 像這樣

func setAttributedString(text string : String, subStringRange range : NSRange, subStringFont font1 : UIFont, mainStringFont font2 : UIFont, subStringColor color1 : UIColor = UIColor.gray, mainStringColor color2 : UIColor = UIColor.green) -> NSAttributedString {

            let mainStringAttribute = [ NSFontAttributeName: font2, NSForegroundColorAttributeName : color2] as [String : Any]
            let attributedString = NSMutableAttributedString(string: string, attributes: mainStringAttribute)

            let subStringAttribute = [ NSFontAttributeName: font1, NSForegroundColorAttributeName : color1] as [String : Any]
            attributedString.addAttributes(subStringAttribute, range: range)

            return attributedString
        }

override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {

     if (section == 0) // this is first header
     { 

    let returnedView = UIView(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 25))
    returnedView.backgroundColor = UIColor.init(red: 229/255, green: 233/255, blue: 236/255, alpha: 1.0)

    let label = UILabel(frame: CGRect(x: -20, y: 7, width: view.frame.size.width, height: 25))
    label.text = self.headerList[section]
    label.textAlignment = .right
        let font1 = UIFont.systemFont(ofSize: 14.0)
        let font2 = UIFont.systemFont(ofSize: 14.0)

        label.attributedText = setAttributedString(text: "", subStringRange: NSRange(location: 0, length: 1), subStringFont: font1, mainStringFont: font2)


  } 
   else /// remaining headers
   {

 let returnedView = UIView(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 25))
    returnedView.backgroundColor = UIColor.init(red: 229/255, green: 233/255, blue: 236/255, alpha: 1.0)

    let label = UILabel(frame: CGRect(x: -20, y: 7, width: view.frame.size.width, height: 25))
    label.text = self.headerList[section]
    label.textAlignment = .right
    label.textColor = .lightGray
}
 }

Answer 4

您可以通過編寫以下代碼來實現：

我創建了一個通用函數以在每個控制器中重用它。

//MARK:- Set title with two different color
func setTitle(title : String, loc : Int, len : Int) -> NSMutableAttributedString
{
    let myMutableString = NSMutableAttributedString(
        string: title,
        attributes: [:])

    myMutableString.addAttribute(
        NSForegroundColorAttributeName,
        value: UIColor(red: 29/255, green: 140/255, blue: 242/255, alpha: 1.0),
        range: NSRange(
            location:loc,
            length:len))

    return myMutableString
}

我正在使用這種功能，

對於同一控制器，您可以編寫它，

self.lblTitle.attributedText = self.setTitle(title: "My Profile", loc: 3, len: 7)

您也可以使用它來更改特定字符的顏色。 您需要指定字符串長度和字符的起始位置。