NSTextAttachmentが含まれているNSAttributedStringでは行間をあけることができない http://blog.ch3cooh.jp/entry/20170310/1489123042

ViewController.swift

//
//  ViewController.swift
//  MultipleLines
//
//  Created by WADAKENJI on 2017/03/10.
//  Copyright © 2017年 ch3cooh.jp. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var label: UILabel!
    
    func setMultipleText() {        
        let str = NSMutableAttributedString()
        
        //プロ生ちゃんアイコンを追加する
        let number = NSTextAttachment()
        if let image = UIImage(named: "sd06") {
            number.image = image
            number.bounds = CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height)
        }
        str.append(NSAttributedString(attachment: number))
        
        //長いテキストを追加する
        let longText = "プロ生ちゃん「ああああああああああああああああああああああああああああああああああああああああああああああああああああああ」"
        str.append(NSAttributedString(string: longText))
        
        //属性を設定する
        let style = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
        let font = UIFont.boldSystemFont(ofSize: 19)
//        style.minimumLineHeight = font.lineHeight + 30
//        style.maximumLineHeight = font.lineHeight + 30
        style.lineSpacing = 30
        
        let attr: [String : Any] = [
            NSFontAttributeName: font,
            NSParagraphStyleAttributeName: style
        ]
        
        //属性を付与する
        str.addAttributes(attr, range: NSRange(location: 0, length: str.length))
        
        //ラベルにNSAttributedStringを設定する
        label.attributedText = str
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        label.lineBreakMode = .byCharWrapping
        label.numberOfLines = 0
        label.backgroundColor = UIColor.cyan
        setMultipleText()
    }

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


}