如何动态调整导航栏中的标题大小

Posted 2021-04-18

我有一些显示在导航控制器中的视图。其中两个视图的导航栏标题较长。

问题是，当标题太长而不适合时，某些字符会被截断并添加“...”。

有什么办法我可以告诉导航栏自动重新调整标题文本的大小以适应吗？

答案

在ViewDidload中使用以下代码。

目标C.

self.title = @"Your TiTle Text";
UILabel* tlabel=[[UILabel alloc] initWithFrame:CGRectMake(0,0, 200, 40)];
tlabel.text=self.navigationItem.title;
tlabel.textColor=[UIColor whiteColor];
tlabel.font = [UIFont fontWithName:@"Helvetica-Bold" size: 30.0];
tlabel.backgroundColor =[UIColor clearColor];
tlabel.adjustsFontSizeToFitWidth=YES;
tlabel.textAlignment = NSTextAlignmentCenter;
self.navigationItem.titleView=tlabel;

Swift版本

self.title = "Your TiTle Text"
let tlabel = UILabel(frame: CGRectMake(0, 0, 200, 40))
tlabel.text = self.title
tlabel.textColor = UIColor.whiteColor()
tlabel.font = UIFont(name: "Helvetica-Bold", size: 30.0)
tlabel.backgroundColor = UIColor.clearColor()
tlabel.adjustsFontSizeToFitWidth = true
tlabel.textAlignment = .center;
self.navigationItem.titleView = tlabel

希望它对你有用。谢谢

另一答案

Swift版本的Accepted Answer +将标签文本放在中心：

Swift 2.3：

    self.title = "Your TiTle Text"
    let tlabel = UILabel(frame: CGRectMake(0, 0, 200, 40))
    tlabel.text = self.title
    tlabel.textColor = UIColor.whiteColor()
    tlabel.font = UIFont.boldSystemFontOfSize(17) //UIFont(name: "Helvetica", size: 17.0)
    tlabel.backgroundColor = UIColor.clearColor()
    tlabel.adjustsFontSizeToFitWidth = true
    tlabel.textAlignment = .Center
    self.navigationItem.titleView = tlabel

和斯威夫特3：

    self.title = "Your TiTle Text"
    let frame = CGRect(x: 0, y: 0, width: 200, height: 40)
    let tlabel = UILabel(frame: frame)
    tlabel.text = self.title
    tlabel.textColor = UIColor.white
    tlabel.font = UIFont.boldSystemFont(ofSize: 17) //UIFont(name: "Helvetica", size: 17.0)
    tlabel.backgroundColor = UIColor.clear
    tlabel.adjustsFontSizeToFitWidth = true
    tlabel.textAlignment = .center
    self.navigationItem.titleView = tlabel

另一答案

上述解决方案都没有为我可靠地工作。但是我通过使用提供答案的不同元素找到了解决方案，它在Swift 2中非常优雅，因为每次更改标签时它不需要任何自定义代码，它只使用标题上的属性观察者。

请注意，在我的情况下，我在导航栏的左侧有一个后退按钮，它将文本从屏幕中心推出，以修复此问题我使用的是属性文本和tailIndent。以下代码中的所有评论/信息：

class VCHowToTopic : UIViewController {


    //add handlers so that any manipulation of the title is caught and transferred to the custom drawn UILabel
    override var title : String? {
        set {
            super.title = newValue
            configureTitleView()
        }
        get {
            return super.title
        }
    }

    //MARK: - lifecycle


    func configureTitleView() {
        //some large number that makes the navigationbar schrink down our view when added
        let someVeryLargeNumber = CGFloat(4096)
        //create our label
        let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: someVeryLargeNumber, height: someVeryLargeNumber))
        //0 means unlimited number of lines
        titleLabel.numberOfLines = 0
        //define style of the text (we will be using attributed text)
        let style = NSMutableParagraphStyle()
        style.alignment = .Center
        //top compensate for the backbutton which moves the centered text to the right side of the screen
        //we introduce a negative tail indent, the number of 56 has been experimentally defined and might
        //depend on the size of your custom back button (if you have one), mine is 22x22 px
        style.tailIndent = -56
        //create attributed text also with the right color
        let attrText = NSAttributedString(string: title!, attributes: [NSParagraphStyleAttributeName : style,
            NSForegroundColorAttributeName : UIColor.whiteColor()])
        //configure the label to use the attributed text
        titleLabel.attributedText = attrText
        //add it as the titleview
        navigationItem.titleView = titleLabel
    }


}

另一答案

如果您将视图添加到titleView中，并且想要调整视图大小，则可以使用此代码（Swift 3）：

self.translatesAutoresizingMaskIntoConstraints = false
self.layoutIfNeeded()
self.sizeToFit()
self.translatesAutoresizingMaskIntoConstraints = true

另一答案

您需要使用uilabel自定义导航栏标题视图并提供调整字体大小..

    [self.navigationItem setTitleView:<"Include any UI View subclass">];

另一答案

这是Swift中的一个例子，它也允许多行。使用PureLayout简化自动布局。

override func viewDidLoad() {
  super.viewDidLoad()
  configureTitleView()
}

func configureTitleView() {
  let titleLabel = UILabel()
  titleLabel.numberOfLines = 0
  titleLabel.textAlignment = .Center
  titleLabel.font = UIFont.boldSystemFontOfSize(17.0)
  titleLabel.text = searchLoc.mapItem.name
  navigationItem.titleView = titleLabel
  titleLabel.autoPinEdgesToSuperviewMargins() // PureLayout method
  titleLabel.adjustsFontSizeToFitWidth = true
}

一个用法示例：