1 extension UIFont {
2 class func fontName(fontName: String, size fontSize: CGFloat) -> UIFont {
3
4 return UIFont(name: fontName, size: fontSize)!
5 }
6 }
7 class ViewController: UIViewController {
8
9 override func viewDidLoad() {
10 super.viewDidLoad()
11 // Do any additional setup after loading the view, typically from a nib.
12 self.navigationItem.title = "Swift"
13
14 ///1.常量
15 let number: Int = 10
16 print("the number is \(number)")
17 //1.1变量
18 var string :String = "hello world!"
19 print("\(string.count)个字符")
20 //1.2检查字符串是否有特定前缀/后缀：hasPrefix/hasSuffix
21 if string.hasPrefix("hello") {
22 print("hello首部")
23 }
24 if string.hasSuffix("!"){
25 print("!在尾部")
26 }
27 //1.3空字符串
28 string = "";
29 if string.isEmpty {
30 print("空字符串")
31 }else{
32 print("非空字符")
33 }
34 //1.4 元组
35 let myproject = (one:"game",two:12345)
36 print("myproject:\(myproject)")
37
38 //1.3 获取随机数
39 let temp:Int = Int(arc4random()%100) + 1;
40 print(temp)
41 let temps : Int = Int(arc4random_uniform(100)) + 1;
42 print(temps)
43
44 /// 创建label
45 let label = UILabel.init(frame: CGRect.init(x: 10, y: 15 + TOP_HEIGHT, width: SCREEN_WIDTH - 20, height: 30))
46 label.text = "the number is \(number)"
47 label.backgroundColor = RED_COLOR;
48 label.textColor = GREEN_COLOR
49 label.font = UIFont.fontName(fontName: "PingFangSC-Regular", size: 14)
50 view.addSubview(label)
51 var variableNumber = 42
52 variableNumber = 24
53 print("the variableNumber is \(variableNumber)")
54
55
56
57 }
