How to Change Title Kerning Value of NavigationBar in iOS using Xamarin - ios

Question

I'm trying to adjust the kerning for the title text in the NavigationBar. I've gotten as far as assigning a custom UIStringAttributes to the NavigationBar title. Setting the font and the text color seems to work fine, but when I input the Kerning Adjustment, nothing happens, regardless of what value I input.
public void SetTitleFont (string fontName, float fontSize, Color foregroundColor)
{
var TitleAttr = new UIStringAttributes {
ForegroundColor = foregroundColor.ToUIColor(),
Font = UIFont.FromName (fontName, fontSize),
KerningAdjustment = 50
};
this.NavigationController.NavigationBar.TitleTextAttributes = TitleAttr;
}

Answer 1

Figured this one out.
What worked out for me was creating a new UILabel, set the attributes for the UILabel, then set the TitleView to the UILabel.
// We will grab the actual title of the Page further down.
string viewTitle = string.Empty;
UINavigationItem navItem = new UINavigationItem();
if (this.NavigationController != null)
{
if (this.NavigationController.VisibleViewController != null)
{
if (this.NavigationController.VisibleViewController.NavigationItem != null)
{
navItem = this.NavigationController.VisibleViewController.NavigationItem;
// Grab the title of the Page you are on.
if (navItem.Title != null)
{
viewTitle = this.NavigationController.VisibleViewController.NavigationItem.Title;
}
}
}
}
// We do not want to set an arbitrary size for the UILabel.
// Otherwise, positioning it will be very difficult.
// The StringSize function will set the size of the UILabel to the absolute
// minimum size of whatever string you specify - given the correct
// parameters (font and fontSize).
CGSize titleSize = viewTitle.StringSize(UIFont.FromName (fontName, size));
// Create the new title UILabel. Make sure to set the Bounds!
pageTitleView = new UILabel {
Bounds = new CGRect (0, 0, titleSize.Width, titleSize.Height),
BackgroundColor = UIColor.FromRGBA(0, 0, 0, 0)
};
var titleAttributes = new NSAttributedString (viewTitle,
new UIStringAttributes () {
ForegroundColor = foregroundColor.ToUIColor(),
Font = UIFont.FromName (fontName, size),
KerningAdjustment = 1.1f
});
// Apply the new attributes to the UILabel and center the text.
pageTitleView.AttributedText = titleAttributes;
pageTitleView.TextAlignment = UITextAlignment.Center;
// Set the TitleView to the new UILabel.
navItem.TitleView = pageTitleView;
I hope this helps!