swift iOS 较大的标题文本具有不同的颜色

Question

我正在尝试确定导航栏标题中是否有以下文本 DRN1 黑色 DRN 和红色 1

我目前使用以下代码

self.tabBarController?.navigationItem.title = "DRN1"

如果我可以在大标题中包含 2 行文本，就像我现在想要播放的第二行一样，那就太好了。

 self.tabBarController?.navigationItem.title = "Now Playing"

Answer 1

您需要将自定义UIView和UILabel添加到NavigationBar 。

代码看起来像这样，

let titleView = UIView(frame: CGRect(x: 50, y: 0, width: (self.navigationController?.navigationBar.frame.size.width ?? 200) - 125, height: self.navigationController?.navigationBar.frame.size.height ?? 150)) // Custom title view

let titleLabel = UILabel(frame: CGRect(x: 0, y: 5, width: titleView.frame.size.width, height: titleView.frame.size.height/2))
titleLabel.textAlignment = NSTextAlignment.center
titleLabel.font = UIFont(name: "HelveticaNeue", size: 18.0)
titleLabel.numberOfLines = 0


let titleString = NSMutableAttributedString(string:"DRN1")   
let myRange = NSRange(location: 3, length: 1) // range starting at location 3 with a lenth of 1: "Strings"
titleString.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.red, range: myRange) // MultiColor title

titleLabel.attributedText = titleString  
titleView.addSubview(titleLabel)


let titleLabel1 = UILabel(frame: CGRect(x: 0, y: titleView.frame.size.height/2, width: titleView.frame.size.width, height: titleView.frame.size.height/2))
titleLabel1.textAlignment = NSTextAlignment.center
titleLabel1.font = UIFont(name: "HelveticaNeue", size: 15.0)
titleLabel1.numberOfLines = 0

titleLabel1.text = "Now Playing"
titleView.addSubview(titleLabel1)

self.navigationItem.titleView = titleView  //Add customView to navigationBar

输出将如下图所示，