如何调整标题在导航栏动态(How to resize Title in a navigation b

我有一些看法，在导航控制器显示出来。这些视图中的两个具有导航栏更长的称号。

问题是，当标题是太长，一些字符被截断，“......”被添加。

有什么办法，我可以告诉导航栏自动重新大小标题文本以适应？

Answer 1:

用于viewDidLoad中下面的代码。

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;

斯威夫特版本

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

希望它为周到，谢谢

Answer 2:

接受的答案+把标签文本的中心斯威夫特版本：

雨燕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SWIFT 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

Answer 3:

上述解决方案缝都不可靠地为我工作。但是我发现了一个解决方案，通过使用不同的元素提供了答案，它在斯威夫特2，是很高雅的，因为它不需要任何自定义代码每次更改标签时，它只是使用属性观察员称号。

需要注意的是在我的情况，我不得不在导航栏上，这推杆文字在屏幕中央的左侧后退按钮，来解决这个问题，我使用属性文本和tailIndent。所有评论在下面的代码/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
    }


}

Answer 4:

如果你有一个观点加入到titleview的，并且要调整视图，您可以使用此代码（SWIFT 3）：

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

Answer 5:

你需要定制具有的UILabel导航栏标题视图，并提供调整字体大小..

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

Answer 6:

下面是斯威夫特的例子还允许多条线路。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
}

以及使用例如：