Swift 简单控件示例：进度条UIProgressView

转载请声明出处：http://www.jb51.cc/article/p-vmrfynex-ga.html
------------------------------------------------------------------------------------------

//
//  ViewController.swift
//  UIProgressViewSample
//
//  Created by jinnchang on 15/4/2.
//  copyright (c) 2015年 Jinn Chang. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    var button: UIButton!
    var progressView: UIProgressView!
    
    var timer: NSTimer!
    var remainTime = 10

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view,typically from a nib.
        
        button = UIButton.buttonWithType(.System) as UIButton
        button.frame = CGRectMake(30,50,self.view.frame.size.width - 60,100)
        button.setTitle("开始计时",forState: .normal)
        button.addTarget(self,action: "buttonAction",forControlEvents: .TouchUpInside)
        
        progressView = UIProgressView(progressViewStyle: .Bar)
        progressView.frame = CGRectMake(30,200,100)
        progressView.progress = 1.0
        
        self.view.addSubview(button)
        self.view.addSubview(progressView)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // dispose of any resources that can be recreated.
    }

    /// 响应按钮点击事件
    func buttonAction() {
        button.enabled = false
        timer = NSTimer.scheduledTimerWithTimeInterval(1,target: self,selector: "timerAction",userInfo: nil,repeats: true)
        timer.fire()
    }
    
    /// 响应定时器事件
    func timerAction() {
        if(remainTime < 0) {
            timer.invalidate()
            println("倒计时结束")
        } else {
            remainTime = remainTime - 1
            let progressValue = Float(remainTime)/10
            progressView.setProgress(progressValue,animated: true)
        }
    }

}