swift--環形進度條（UIActivityIndicatorView）的用法

swift中，除了條形進度條，還有環形進度條，俗稱“菊花”,效果如下圖

1，創建

var activityIndicator:UIActivityIndicatorView!

 func creatActivity(){
        activityIndicator = UIActivityIndicatorView(activityIndicatorStyle:UIActivityIndicatorViewStyle.gray)
        activityIndicator.center = self.view.center
        self.view.addSubview(activityIndicator)
        //開發觸發
        play()
    }

    func play(){
        //進度條開始轉動
        activityIndicator.startAnimating()
    }
    
    func stop() {
        //進度條停止轉動
        activityIndicator.stopAnimating()
    }

2，判斷點擊屏幕一下，停止菊花，具體代碼如下：

 override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        
        for touch:AnyObject in touches {
            let t:UITouch = touch as! UITouch
            //當在屏幕上拍動一下時，終止環形進度條
            if t.tapCount == 1{
                self.stop()
            }
        }

 

結束！

1創建