本文將演示標籤控制元件的換行功能，

在專案導航區，開啟檢視控制器的程式碼檔案【ViewController.swift】

 1 import UIKit
 2 
 3 class ViewController: UIViewController {
 4 
 5     override func viewDidLoad() {
 6         super.viewDidLoad()
 7         // Do any additional setup after loading the view, typically from a nib.
 8         //
 
建立一個位置在(10,100),尺寸為(300,150)的顯示區域
 9         let rect = CGRect(x: 10, y: 100, width: 300, height: 150)
10         //設定標籤物件的顯示區域
11         let label = UILabel(frame: rect)
12         //然後給標籤物件，設定一段較長的文字內容
13         label.text = "Love you、think of you.love you secretly,love you eagerly,wait ,feel disappointed,try hard,lose,and feel sad,go apart,and recall.these are for sake of you.And I will regret for it.
 
"
14         
15         //設定標籤的背景顏色為橙色
16         label.backgroundColor = UIColor.orange
17         //設定標籤文字的顏色為紫色
18         label.textColor = UIColor.purple
19         //設定標籤文字的對齊方式為居中對齊
20         label.textAlignment = NSTextAlignment.center
21         
22         //設定標籤文字的換行方式為：
23         //以空格為界，並保留整個單詞（即在換行處不會切割單詞）
 

24         label.lineBreakMode = NSLineBreakMode.byWordWrapping
25         //設定標籤物件不限制行數
26         label.numberOfLines = 0
27         
28         //將標籤物件，新增到當前檢視控制器的根檢視
29         self.view.addSubview(label)
30     }
31 
32     override func didReceiveMemoryWarning() {
33         super.didReceiveMemoryWarning()
34         // Dispose of any resources that can be recreated.
35     }
36 }