代码如下
<pre>
<code>
`
import UIKit
class ViewController: UIViewController
{
let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.Gray)
override func viewDidLoad()
{
super.viewDidLoad()
let btnPlay = UIButton()
btnPlay.frame = CGRectMake(20, 20, 100, 40)
btnPlay.layer.borderColor = UIColor.blueColor().CGColor
btnPlay.layer.borderWidth = 2
btnPlay.setTitle("play", forState: .Normal)
btnPlay.setTitleColor(UIColor.redColor(), forState: .Normal)
btnPlay.addTarget(self, action: #selector(ViewController.play), forControlEvents: .TouchUpInside)
self.view.addSubview(btnPlay)
let btnStop = UIButton()
btnStop.frame = CGRectMake(20, 100, 100, 40)
btnStop.layer.borderColor = UIColor.blueColor().CGColor
btnStop.layer.borderWidth = 2
btnStop.setTitle("stop", forState: .Normal)
btnStop.setTitleColor(UIColor.redColor(), forState: .Normal)
btnStop.addTarget(self, action: #selector(ViewController.stop), forControlEvents: .TouchUpInside)
self.view.addSubview(btnStop)
activityIndicator.center = self.view.center
//在view中添加控件activityIndicator
self.view.addSubview(activityIndicator)
}
//菊花转动开始
func play()
{
activityIndicator.startAnimating()
}
//菊花转动结束
func stop()
{
activityIndicator.stopAnimating()
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
`
</code>
</pre>
