CustomNavigationBarTitle.swift

func adjustNavigationBarTitleToVisibleFullText() {
    let titleLabel = UILabel(frame: CGRectMake(0, 0, 1000, 44))
    titleLabel.text = self.title
    titleLabel.numberOfLines = 2
    titleLabel.font = UIFont.GBNavigationBarFont()
    titleLabel.textAlignment = NSTextAlignment.Center
    titleLabel.textColor = UIColor.GBNavigationBarForegroundColor()
    titleLabel.adjustsFontSizeToFitWidth = true
    self.navigationItem.titleView = titleLabel
  }
  
  func adjustNavigationBarTitleToDefault() {
    self.navigationItem.titleView = nil
  }
  
  override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    adjustNavigationBarTitleToVisibleFullText()
  }
  
  override func viewWillDisappear(animated: Bool) {
    super.viewWillDisappear(animated)
    adjustNavigationBarTitleToDefault()
  }