import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {

        super.viewDidLoad()

        // 1.创建label

        var swiftLabel : UILabel = UILabel(frame: CGRectMake(, , , ))

        // 2.设置label的内容

        swiftLabel.text = "swiftLablel"

        // 3.设置label内容的颜色

        swiftLabel.textColor = UIColor.blueColor()

        // 4.设置label的背景颜色

        swiftLabel.backgroundColor = UIColor.greenColor()

        // 5.切圆角

        swiftLabel.layer.cornerRadius =

        swiftLabel.layer.masksToBounds = true

        // 6.设置居中

        swiftLabel.textAlignment = NSTextAlignment.Center;

        // 7.设置字的大小

        swiftLabel.font = UIFont.systemFontOfSize()

        // 8. 设置断行模式,单词断行

        swiftLabel.lineBreakMode = NSLineBreakMode.ByWordWrapping

        // 9.设置行数,设置为0,如果文本框有足够的显示会全部显示

        swiftLabel.numberOfLines = 

        // 10.将label加入到view

        self.view.addSubview(swiftLabel)

    }

}