导航栏标题标签文本

Question

在iOS中，是否可以让标题文本缩小以适应UINavigationBar（竖屏iPhone应用程序没有自动布局）？

我正在动态设置标题栏，但有时文本太长，目前只是用省略号将其截断。

例如："This is the t..."

我希望它缩小文本而不是截断。

- Fogmeister

Answer 1

你可以创建自己的标题视图来实现。

类似这样：

- (void)viewDidLoad
{
    [super viewDidLoad];

  //Do any additional setup after loading the view, typically from a nib.
     UILabel *titleLabelView = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 40)]; //<<---- Actually will be auto-resized according to frame of navigation bar;
    [titleLabelView setBackgroundColor:[UIColor clearColor]];
    [titleLabelView setTextAlignment: NSTextAlignmentCenter];
    [titleLabelView setTextColor:[UIColor whiteColor]];
    [titleLabelView setFont:[UIFont systemFontOfSize: 27]]; //<<--- Greatest font size
    [titleLabelView setAdjustsFontSizeToFitWidth:YES]; //<<---- Allow shrink
     // [titleLabelView setAdjustsLetterSpacingToFitWidth:YES];  //<<-- Another option for iOS 6+
    titleLabelView.text = @"This is a Title";

    navigationBar.topItem.titleView = titleLabelView;

    //....
}

希望这可以帮到你。

- Hail Zhang

---

谢谢，实际上我已经做过类似的事情了。在UILabel上使用了一个分类，为我快速创建了所有视图控制器中的内容。 - Fogmeister

Answer 2

Xcode 7.1 - Swift 2.0


//Adding Title Label
        var navigationTitlelabel = UILabel(frame: CGRectMake(0, 0, 200, 21))
        navigationTitlelabel.center = CGPointMake(160, 284)
        navigationTitlelabel.textAlignment = NSTextAlignment.Center
        navigationTitlelabel.textColor  = UIColor.whiteColor()
        navigationTitlelabel.text = "WORK ORDER"
        self.navigationController!.navigationBar.topItem!.titleView = navigationTitlelabel

- Alvin George

Answer 3

我在Swift 4中使用了这段代码（请注意，标签矩形不重要...）。

func navBar()->UINavigationBar?{
        let navBar = self.navigationController?.navigationBar
        return navBar
    }


override func viewDidLoad() {
        super.viewDidLoad()

        setTNavBarTitleAsLabel(title: "VERYYYY VERYYYY VERYYYY VERYYYY VERYYYY VERYYYY VERYYYY LONGGGGGG")
    }

    // will shrink label...

    func setTNavBarTitleAsLabel(title: String, color: UIColor ){

        // removed some code..

        let navigationTitlelabel = UILabel(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
        navigationTitlelabel.numberOfLines = 1
        navigationTitlelabel.lineBreakMode = .byTruncatingTail

        navigationTitlelabel.adjustsFontSizeToFitWidth = true
        navigationTitlelabel.minimumScaleFactor = 0.1
        navigationTitlelabel.textAlignment = .center
        navigationTitlelabel.textColor  = color
        navigationTitlelabel.text = title

        if let navBar = navBar(){
            //was navBar.topItem?.title = title

            self.navBar()?.topItem?.titleView = navigationTitlelabel
            //navBar.titleTextAttributes = [.foregroundColor : color ?? .black]
        }
    }

- ingconti