Adjust navigation bar title font size to fit text - ios

Question

Is it possible to adjust the font size of the navigation bar's title to fit the text?

Answer 1

You can create a UILabel and set it to UINavigationItem's titleView. See Apple doc: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UINavigationItem_Class/#//apple_ref/occ/instp/UINavigationItem/titleView
For the created UILabel, you can set the adjustsFontSizeToFitWidth & minimumScaleFactor properties to let it fit the title. Doc:
https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UILabel_Class/#//apple_ref/occ/instp/UILabel/adjustsFontSizeToFitWidth
Some codes:
- (void)setMyTitle:(NSString *)title
{
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.navigationController.view.bounds.size.width - 100, 44)];
titleLabel.text = title;
titleLabel.font = [UIFont systemFontOfSize:16];
titleLabel.textColor = ...
...
self.navigationItem.titleView = titleLabel;
}

Answer 2

Try the following in viewDidLoad:
NSDictionary *attributes = #{ NSFontAttributeName: [UIFont fontWithName:#"HelveticaNeue-Bold" size:14] };
[self.navigationController.navigationBar setTitleTextAttributes:attributes];
NOTE: The downside to this solution is that you have to know the font size up front and set it manually. I'm not sure if you can set the navigation bar's title label to automatically change the font size to fit the text.
EDIT:
Turns out you can set the navigation bar's label to resize the font size dynamically

Answer 3

Swift 5
private var isFirst = true
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
guard isFirst else {
return
}
isFirst = false
// Adjust Navigation Title by text
if let navigationController = navigationController {
let bar = navigationController.navigationBar
var minX: CGFloat = 0
var maxX: CGFloat = bar.bounds.width
if let lastLeft = navigationItem.leftBarButtonItems?.last, let leftView = lastLeft.view, let buttonBarStackViewFrame = leftView.superview?.frame {
minX = buttonBarStackViewFrame.maxX
}
if let firstRight = navigationItem.rightBarButtonItems?.first, let rightView = firstRight.view, let buttonBarStackViewFrame = rightView.superview?.frame {
maxX = buttonBarStackViewFrame.minX
}
let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: maxX - minX, height: bar.bounds.height))
titleLabel.text = LocStr(.favorite_master_title)
titleLabel.adjustsFontSizeToFitWidth = true
titleLabel.minimumScaleFactor = 0.3
titleLabel.textColor = UIColor.white
titleLabel.textAlignment = .center
if UIDevice.current.modelName.contains(PLUS) {
titleLabel.font = UIFont(name: GENERAL_FONT_NAME, size: PLUS_NAVIGATION_BAR_TITLE_FONT)!
} else {
titleLabel.font = UIFont(name: GENERAL_FONT_NAME, size: GENERAL_NAVIGATION_BAR_TITLE_FONT)!
}
navigationItem.titleView = titleLabel
}
}
with a Extension
extension UIBarButtonItem {
var view: UIView? {
return value(forKey: "view") as? UIView
}
}