Question

我正在尝试在导航栏中设置标题标签以允许多行。我有自定义导航控制器代码，我将多行代码放入。我知道代码已经存在，但我的多行部分无效。

let titleLabel = UILabel()
titleLabel.frame = CGRectMake(0, 0, self.navigationBar.frame.width, self.navigationBar.frame.height * 2)
titleLabel.numberOfLines = 0
titleLabel.lineBreakMode = .ByWordWrapping

navigationItem.titleView = titleLabel

但是文字最后仍然没有结束。我也尝试将其放入单个视图控制器本身，在self.navigationController?.前面添加navigationItem，结果相同。

我的代码中是否有某些内容会使标题标签不能使用多行？

Answer 1

以下是如何创建多行navigationBar标题

的代码示例

let label: UILabel = UILabel(frame: CGRectMake(0, 0, 400, 50))
label.backgroundColor = UIColor.clearColor()
label.numberOfLines = 2
label.font = UIFont.boldSystemFontOfSize(16.0)
label.textAlignment = .Center
label.textColor = UIColor.whiteColor()
label.text = "This is a\nmultiline string for the navBar"
self.navigationItem.titleView = label

Swift 3.0：

let label = UILabel(frame: CGRect(x:0, y:0, width:400, height:50))
label.backgroundColor = .clear
label.numberOfLines = 2
label.font = UIFont.boldSystemFont(ofSize: 16.0)
label.textAlignment = .center
label.textColor = .white
label.text = "This is a\nmultiline string for the navBar"
self.navigationItem.titleView = label

Answer 2

使用此选项可以完全按照您的意愿获取标签位置：

let labelWidth = navBar.bounds.width - 110

    let label = UILabel(frame: CGRect(x:(navBar.bounds.width/2) - (labelWidth/2), y:0, width:labelWidth, height:navBar.bounds.height))
    label.backgroundColor = UIColor.clear
    label.numberOfLines = 0
    label.font = UIFont.boldSystemFont(ofSize: 13.0)
    label.textAlignment = .center
    label.textColor = UIColor.black
    label.lineBreakMode = .byWordWrapping

    label.text = loadedName
    navBar.topItem?.title = nil
    navBar.addSubview(label)

顶行中的110值是您想要标签任一侧的间距。

Answer 3

swift 5+ 非常简单的解决方案

func titleMultiLine(topText: String, bottomText: String) {
    //            let titleParameters = [NSForegroundColorAttributeName : UIColor.white,
    //                                   NSFontAttributeName : UIFont.<Font>]
//            let subtitleParameters = [NSForegroundColorAttributeName : UIColor.<Color>(),
    //                                      NSFontAttributeName : UIFont.<Font>]
    let titleParameters = [NSAttributedString.Key.foregroundColor : UIColor.white]
    
    let subtitleParameters = [NSAttributedString.Key.foregroundColor : UIColor.white]
    
    let title:NSMutableAttributedString = NSMutableAttributedString(string: topText, attributes: titleParameters)
    let subtitle:NSAttributedString = NSAttributedString(string: bottomText, attributes: subtitleParameters)
    
    title.append(NSAttributedString(string: "\n"))
    title.append(subtitle)
    
    let size = title.size()
    
    let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: size.width, height: size.height))
    titleLabel.attributedText = title
    titleLabel.numberOfLines = 0
    titleLabel.textAlignment = .center
    
    navigationItem.titleView = titleLabel
}

函数调用

self.titleMultiLine(topText: "I am top text Title", bottomText: "bottom text")

多行导航栏标题

3 个答案: