iOS开发——UI篇Swift篇&UIActivityIndicatorView

 1     override func viewDidLoad() {
 2         super.viewDidLoad()
 3         
 4         titleLabel.text = titleString
 5         
 6         // Do any additional setup after loading the view.
 7         
 8         //创建活动指示器
 9         var activityView:UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(20, 100, 20, 20))
10         
11         //添加到视图上
12         self.view.addSubview(activityView)
13         
14         //启动
15         activityView.startAnimating()
16         
17         //如果希望指示器停止后自动隐藏，只需要设置hidesWhenStopped属性为YES。默认是YES，设置为NO停止后指示器仍会显示。
18         activityView.hidesWhenStopped = true
19         
20         //停止
21         activityView.stopAnimating()
22         
23         
24         //设置属性风格
25         activityView.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
26         
27         //获取应用单利
28         var app:UIApplication = UIApplication.sharedApplication()
29         
30         //设置网络活动指示器加载
31         app.networkActivityIndicatorVisible = true
32         
33         
34     }