Swift: UISegmentedControl with multiline labels (tested on iOS 9.3).

UISegmentedControl-Multiline.swift

// Remember to initialize UISegmentedControl with appropriate titles.
extension UISegmentedControl {
    func makeMultiline(withFontName fontName: String, fontSize: CGFloat, textColor: UIColor){
        for index in 0...self.numberOfSegments - 1 {
            
            let label = UILabel(frame: CGRectMake(0,0,self.frame.width/CGFloat(self.numberOfSegments),self.frame.height))
            label.font = UIFont(name: fontName, size: fontSize)
            label.textColor = textColor
            label.text = self.titleForSegmentAtIndex(index)
            label.numberOfLines = 0
            label.textAlignment = .Center
            label.adjustsFontSizeToFitWidth = true
            
            self.setTitle("", forSegmentAtIndex: index)
            self.subviews[index].addSubview(label)
        }
    }
}

in case you need to change the title color
you need to add in the function "makeMultiline" => label.tag = i

then add this function in the extension

`func setSelectedTitleColor() {

for i in 0...self.numberOfSegments - 1 {

  let label = self.subviews[self.numberOfSegments - 1 - i].subviews[1] as? UILabel

  label?.textColor = label?.tag == self.selectedSegmentIndex ? UIColor.red : UIColor.blue
}

}`