1 Swift code

//
//  ViewController.swift
//  Test
//
//  Created by 开发 on 2017/10/27.
//  Copyright ? 2017年 com.cuanbo.beaconeu. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var seg1: UISegmentedControl!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //dic 属性值
        //UITextAttributeTextColor
        //UITextAttributeTextShadowColor
        //UITextAttributeTextShadowOffset
        //UITextAttributeFont
        //UIFontfontWithName

        let dic:NSDictionary = [NSForegroundColorAttributeName:UIColor.red,NSFontAttributeName:UIFont.boldSystemFont(ofSize: 25)];
        
        seg1.setTitleTextAttributes(dic as! [AnyHashable : Any],for: UIControlState.normal);
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

2 效果图：

（编辑：李大同）

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