iOS开发——UI篇Swift篇&UIActivityIndicatorView

UIActivityIndicatorView

     override func viewDidLoad() {
         super.viewDidLoad()

         titleLabel.text = titleString

         // Do any additional setup after loading the view.

         //创建活动指示器
         var activityView:UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(, , , ))

         //添加到视图上
         self.view.addSubview(activityView)

         //启动
         activityView.startAnimating()

         //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。
         activityView.hidesWhenStopped = true

         //停止
         activityView.stopAnimating()

         //设置属性风格
         activityView.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray

         //获取应用单利
         var app:UIApplication = UIApplication.sharedApplication()

         //设置网络活动指示器加载
         app.networkActivityIndicatorVisible = true

     }