Xcode9学习笔记25 - 文本标签的自动换行UILabel，lineBreakMode

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let rect = CGRect(x: 10, y: 100, width: 300, height: 150)//创建一个显示区域
        let label = UILabel(frame: rect)//设置标签对象的显示区域
        label.text = "Start Developing iOS Apps (Swift) is the perfect starting point for learning to create apps that run on iPhone and iPad. View this set of incremental lessons as a guided introduction to building your first app—including the tools, major concepts, and best practices that will ease your path.";
        
        label.backgroundColor = UIColor.brown//设置标签背景色
        label.textColor = UIColor.purple//设置标签文字颜色
        label.textAlignment = NSTextAlignment.center//设置标签文字的对齐方式
        
        //设置标签文字对齐方式：以空格为界，并保留整个单词
        label.lineBreakMode = NSLineBreakMode.byWordWrapping
        label.numberOfLines = 0//设置标签对象不限制行数
        
        self.view.addSubview(label)//将标签对象添加到当前视图控制器的根视图
    }