不同颜色的TextView，Swift

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var textView: UITextView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let attributedString = NSMutableAttributedString(string: "Hello, World!")
        
        // 设置第一个字符为红色
        attributedString.addAttribute(.foregroundColor, value: UIColor.red, range: NSRange(location: 0, length: 1))
        
        // 设置第六个字符为绿色
        attributedString.addAttribute(.foregroundColor, value: UIColor.green, range: NSRange(location: 6, length: 1))
        
        // 设置TextView的attributedText属性
        textView.attributedText = attributedString
    }
}