[Xcode 实际操作]四、常用控件-(4)UILabel文本标签的自动换行

本文将演示标签控件的换行功能，

在项目导航区，打开视图控制器的代码文件【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         //创建一个位置在(10,100),尺寸为(300,150)的显示区域
 9         let rect = CGRect(x: 10, y: 100,  300, height: 150)
10         //设置标签对象的显示区域
11         let label = UILabel(frame: rect)
12         //然后给标签对象，设置一段较长的文本内容
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         //设置标签的背景颜色为橙色
16         label.backgroundColor = UIColor.orange
17         //设置标签文字的颜色为紫色
18         label.textColor = UIColor.purple
19         //设置标签文字的对齐方式为居中对齐
20         label.textAlignment = NSTextAlignment.center
21         
22         //设置标签文字的换行方式为：
23         //以空格为界，并保留整个单词（即在换行处不会切割单词）
24         label.lineBreakMode = NSLineBreakMode.byWordWrapping
25         //设置标签对象不限制行数
26         label.numberOfLines = 0
27         
28         //将标签对象，添加到当前视图控制器的根视图
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 }