Progress Demo

1. 新增專案



2. 新增 Progress 元件



3. 為顯示結果，亦拖曳 Label



4. 新增 Button 開啟 Progress



5. Label



6. Progress



7. Button




8. 完整程式


//
//  ViewController.swift
//  ProgressDemo
//
//  Created by Elvis Meng on 2015/10/18.
//  Copyright © 2015年 Elvis Meng. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    var time:Float = 0.0
    var timer = NSTimer()
    
    @IBOutlet weak var showProgress: UILabel!
    @IBOutlet weak var progress: UIProgressView!
    @IBOutlet weak var buttonStatus: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        progress.frame.size.width = 200
        progress.progressTintColor = UIColor.redColor()
        progress.trackTintColor = UIColor.greenColor()
        progress.progress = Float(0)
    }

    @IBAction func startProgress(sender: UIButton) {
        timer = NSTimer.scheduledTimerWithTimeInterval(0.1, 
                                                       target: self, 
                                                       selector:Selector("setProgress"),
                                                       userInfo: nil, 
                                                       repeats: true)
        buttonStatus.enabled = false
    }
    
    func setProgress() {
        time += 1.0
        progress.progress = time / 100
        showProgress.text = "\(time)%"
        if time >= 100 {
            timer.invalidate()
            buttonStatus.enabled = true
        }
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}


9. 測試



後記：

Progress 這專案中，timer 的設定是關鍵，除此要知道目前現況時，就要設定類別為UIProgressView的 .progress 這屬性。

參考:

1. Progress View Tutorialin iOS8 with Swift , http://www.ioscreator.com/tutorials/progress-view-tutorial-in-ios8-with-swift
2. Swift Demo – Add Progress Bar, http://rshankar.com/swift-demo-add-progress-bar/
3. Swift-Creating a Progress Bar, http://stackoverflow.com/questions/31432777/swift-creating-a-progress-bar