How to Change Font Size and Font Name of Uisegmentedcontrol Programmatically on Swift

how to change font size and font name of uisegmentedcontrol programmatically on swift?

UI can use control appearance, best place to add it is in app delegate, didFinishLaunchingWithOptions method, use this if you want to set up the same attribute to every UISegmentedControls in your project just once:

let attr = NSDictionary(object: UIFont(name: "HelveticaNeue-Bold", size: 16.0)!, forKey: NSFontAttributeName)
UISegmentedControl.appearance().setTitleTextAttributes(attr as [NSObject : AnyObject] , forState: .Normal)

But if you are going to set up attributes to just one UISegmentedControl or if you want to change it more often base on some condition use this, UISegmentedControl method:

func setTitleTextAttributes(_ attributes: [NSObject : AnyObject]?,
                   forState state: UIControlState)

Example:

let attr = NSDictionary(object: UIFont(name: "HelveticaNeue-Bold", size: 16.0)!, forKey: NSFontAttributeName)
seg.setTitleTextAttributes(attr as [NSObject : AnyObject] , forState: .Normal)

Segment Control Font size not changing in swift

try this:

    let font = UIFont.systemFont(ofSize: 16)

    let normalAttribute: [NSAttributedString.Key: Any] = [.font: font, .foregroundColor: UIColor.gray]
    segmentControl.setTitleTextAttributes(normalAttribute, for: .normal)

    let selectedAttribute: [NSAttributedString.Key: Any] = [.font: font, .foregroundColor: UIColor.red]
    segmentControl.setTitleTextAttributes(selectedAttribute, for: .selected)

How do I change the font of my UISegmentedControl to the Light styled system font?

To create a system font, instead of the standard UIFont constructor use the class method UIFont.systemFontOfSize(fontSize, weight).
For the light font use the UIFontDescriptor constant UIFontWeightLight.

For reference see UIFont and UIFontDescriptor class references.

Set segmented control font for any width class size

Check device model:

let model = UIDevice.currentDevice().model

if model == "iPad" {
    let attr = NSDictionary(object: UIFont(name: "HelveticaNeue-Bold", size: 16.0)!, forKey: NSFontAttributeName as NSCopying)
    segmentedControl.setTitleTextAttributes(attr as [NSObject : AnyObject] , for: .normal)
}else{
    let attr = NSDictionary(object: UIFont(name: "HelveticaNeue", size: 16.0)!, forKey: NSFontAttributeName as NSCopying)
    segmentedControl.setTitleTextAttributes(attr as [NSObject : AnyObject] , for: .normal)
}

The code can be better.

Is it possible to use size classes to adjust the text size for UISegmentedControl objects?

You can use size classes in Interface Builder to substitute a different segmented control with a larger font size when you're running on iPad as opposed to iPhone. But you cannot use size class in Interface Builder just to set a different font size on the same segmented control.

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