swift中UIActivityIndicatorView的使用

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1. // 实例化  
2. let activityview = UIActivityIndicatorView(frame: CGRectMake(10.0, 10.0, 50.0, 50.0))  
3. self.view.addSubview(activityview)  
4.           
5. activityview.backgroundColor = UIColor.yellowColor()          
6. activityview.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge  
7. activityview.color = UIColor.redColor()  
8.           
9. // 停止转圈圈时，隐藏  
10. activityview.hidesWhenStopped = true  
11. activityview.startAnimating()  
12.           
13. activityview.tag = 1000  

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1. let swithch = UISwitch(frame: CGRectMake(100.0, 10.0, 0.0, 0.0))  
2. self.view.addSubview(swithch)  
3. swithch.on = false  
4. swithch.addTarget(self, action: Selector("switchValueChange:"), forControlEvents: UIControlEvents.ValueChanged)  

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1. // MARK: - switchValueChange  
2. func switchValueChange(sender:UISwitch)  
3. {  
4.         let activityview = self.view.viewWithTag(1000) as! UIActivityIndicatorView  
5.           
6.         let openStatus = sender.on  
7.         if openStatus  
8.         {  
9.             if !activityview.isAnimating()  
10.             {  
11.                 activityview.startAnimating()  
12.             }  
13.         }  
14.         else  
15.         {  
16.             activityview.stopAnimating()  
17.         }  
18. }