論 Swift 開發入門：活動指標（UIActivityIndicatorView）

標籤：ios   swift   活動指標   uiactivityindicatorv   

轉載請聲明出處：http://blog.csdn.net/jinnchang/article/details/44828021
------------------------------------------------------------------------------------------
程式碼範例

////  ViewController.swift//  UIActivityIndicatorViewSample////  Created by jinnchang on 15/4/1.//  Copyright (c) 2015年 Jinn Chang. All rights reserved.//import UIKitclass ViewController: UIViewController {        var button1: UIButton!    var button2: UIButton!    var activityIndicatorView: UIActivityIndicatorView!    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.                // 定義一個顯示 activityIndicatorView 的按鈕        button1 = UIButton.buttonWithType(UIButtonType.System) as UIButton        button1.frame = CGRectMake(self.view.frame.width/2 - 200, 50, 400, 50)        button1.setTitle("顯示", forState: UIControlState.Normal)        button1.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)        button1.tag = 1                // 定義一個隱藏 activityIndicatorView 的按鈕        button2 = UIButton.buttonWithType(UIButtonType.System) as UIButton        button2.frame = CGRectMake(self.view.frame.width/2 - 200, 150, 400, 50)        button2.setTitle("隱藏", forState: UIControlState.Normal)        button2.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)        button2.tag = 2                // 定義一個 activityIndicatorView        activityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.White)        activityIndicatorView.frame = CGRectMake(self.view.frame.size.width/2 - 50, 250, 100, 100)        activityIndicatorView.hidesWhenStopped = true        activityIndicatorView.color = UIColor.blackColor()                self.view.addSubview(button1)        self.view.addSubview(button2)        self.view.addSubview(activityIndicatorView)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }        /// 按鈕響應事件    func buttonAction(sender: UIButton) {        let num = sender.tag        switch num {        case 1:            activityIndicatorView.startAnimating()        case 2:            activityIndicatorView.stopAnimating()        default:            break        }    }}

------------------------------------------------------------------------------------------
結果展示
------------------------------------------------------------------------------------------
結語GitHub 上項目地址：UIActivityIndicatorViewSample

文章最後更新時間：2015年4月2日09:41:40。更多資料參考：

UIActivityIndicatorView Class Reference

UIKit User Interface Catalog: Activity Indicators

論 Swift 開發入門：活動指標（UIActivityIndicatorView）