用两行更改此自定义导航栏中的文本颜色？

Posted 2023-03-14

【中文标题】用两行更改此自定义导航栏中的文本颜色？

【英文标题】：Change the color of text in this custom navigation bar with two rows?

【发布时间】：2019-06-12 19:54:18

【问题描述】：

我目前有一个启用大标题的导航栏，它还支持两行，在 viewdidLoad 中有以下代码：

navigationController?.navigationBar.prefersLargeTitles = true
        self.navigationController?.navigationItem.largeTitleDisplayMode = .automatic

        let date = Date()
        let formatter = DateFormatter()
        formatter.dateFormat = "MMMM dd"
        let result = formatter.string(from: date)




        self.title = “This is a Test\n\(result)"



        var count = 0
        for item in(self.navigationController?.navigationBar.subviews)! 
            for sub in item.subviews
                if sub is UILabel
                    if count == 1 
                        break;
                    
                    let titleLab :UILabel = sub as! UILabel
                    titleLab.numberOfLines = 0
                    titleLab.text = self.title
                    titleLab.lineBreakMode = .byWordWrapping
                    count = count + 1
                
            

        
        self.navigationController?.navigationBar.layoutSubviews()
        self.navigationController?.navigationBar.layoutIfNeeded()

如何更改每行文本的字体和颜色 self.title = “This is a Test\n\(result)"

例如，将"This is a Test"设为黑色和"(result)"设为灰色。

【参考方案1】：

首先从string创建一个attributedString并添加所需的attributes，即

let result = "13 June 2019"
let text = "This is a Test\n\(result)"
let arr = text.components(separatedBy: .newlines)

let attributedString = NSMutableAttributedString()
for (index, str) in arr.enumerated() 
    let attrStr = NSMutableAttributedString(string: str)
    if index == 0 
        attrStr.addAttribute(.foregroundColor, value: UIColor.red, range: NSRange(location: 0, length: str.count))
        attrStr.addAttribute(.font, value: UIFont.systemFont(ofSize: 12.0, weight: .bold), range: NSRange(location: 0, length: str.count))
     else 
        attrStr.addAttribute(.foregroundColor, value: UIColor.blue, range: NSRange(location: 0, length: str.count))
        attrStr.addAttribute(.font, value: UIFont.systemFont(ofSize: 12.0), range: NSRange(location: 0, length: str.count))
    
    if index < arr.count 
        attributedString.append(NSAttributedString(string: "\n"))
    
    attributedString.append(attrStr)

创建一个UILabel 并将此attributedString 添加为attributedText 的label。

let label = UILabel()
label.textAlignment = .center
label.numberOfLines = 0
label.attributedText = attributedString

将此label 添加为titleView 的navigationItem，即

self.navigationItem.titleView = label

【讨论】：

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