swift--环形进度条（UIActivityIndicatorView）的用法

swift中，除了条形进度条，还有环形进度条，俗称“菊花”,效果如下图

1，创建

var activityIndicator:UIActivityIndicatorView!

 func creatActivity(){
        activityIndicator = UIActivityIndicatorView(activityIndicatorStyle:UIActivityIndicatorViewStyle.gray)
        activityIndicator.center = self.view.center
        self.view.addSubview(activityIndicator)
        //开发触发
        play()
    }

    func play(){
        //进度条开始转动
        activityIndicator.startAnimating()
    }
    
    func stop() {
        //进度条停止转动
        activityIndicator.stopAnimating()
    }

2，判断点击屏幕一下，停止菊花，具体代码如下：

 override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        
        for touch:AnyObject in touches {
            let t:UITouch = touch as! UITouch
            //当在屏幕上拍动一下时，终止环形进度条
            if t.tapCount == 1{
                self.stop()
            }
        }

结束！

1创建