ios swift 实现饼状图进度条

//

//  ProgressControl.swift

//  L02MyProgressControl

//

//  Created by plter on 7/29/14.

//  Copyright (c) 2014 jikexueyuan. All rights reserved.

//

import UIKit

class ProgressControl: UIView {

    override init(frame: CGRect) {

        super.init(frame: frame)

        // Initialization code

        self.backgroundColor = UIColor(white: 1, alpha: 0)

    }

    required init(coder aDecoder: NSCoder) {

        fatalError("init(coder:) has not been implemented")

    }

    private var _progressValue:CGFloat = 0

    public func getProgressValue()->CGFloat{

        return _progressValue

    }

    public func setProgressValue(value:CGFloat){

        _progressValue = value

        setNeedsDisplay()

    }

    // Only override drawRect: if you perform custom drawing.

    // An empty implementation adversely affects performance during animation.

    override func drawRect(rect: CGRect)

    {

        // Drawing code

        var ctx = UIGraphicsGetCurrentContext()

        var r = rect.width/2

        CGContextAddArc(ctx, r, r, r, 0, 3.141592653*2, 0)

        CGContextSetRGBFillColor(ctx, 0.7, 0.7, 0.7, 1)

        CGContextFillPath(ctx)

        CGContextAddArc(ctx, r, r, r, 0, 3.141592653*2*_progressValue, 0)

        CGContextAddLineToPoint(ctx, r, r)

        CGContextSetRGBFillColor(ctx, 0, 0, 1, 1)

        CGContextFillPath(ctx)

    }

}

viewcontroller：

//

//  ViewController.swift

//  L02MyProgressControl

//

//  Created by plter on 7/29/14.

//  Copyright (c) 2014 jikexueyuan. All rights reserved.

//

import UIKit

class ViewController: UIViewController {

    @IBAction func addProgressBtnPressed(sender: AnyObject) {

        pc.setProgressValue(pc.getProgressValue()+0.1)

    }

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        pc = ProgressControl(frame: CGRect(x: 100, y: 100, width: 100, height: 100))

        self.view.addSubview(pc)

    }

    private var pc:ProgressControl!

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}

使用alertview展示的方案：

            let frame = CGRectMake(0, 0, 78, 78)

            let window = UIWindow()

            window.backgroundColor = UIColor.clearColor()

            let mainView = UIView()

            mainView.layer.cornerRadius = 12

            mainView.backgroundColor = UIColor(red:0, green:0, blue:0, alpha: 0.8)

            let ai = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.WhiteLarge)

            ai.frame = CGRectMake(21, 21, 36, 36)

            ai.startAnimating()

            mainView.addSubview(ai)

            window.frame = frame

            mainView.frame = frame

            window.windowLevel = UIWindowLevelAlert

            window.center = self.view.center

            window.hidden = false

            window.addSubview(mainView)

一般的实现方法：

  //  activityIndicatorView

            m_objActivityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.WhiteLarge)

            m_objActivityIndicatorView!.frame = CGRectMake(self.view.frame.size.width/2 - 100, self.view.frame.size.height/2 - 100, 200, 200)

            m_objActivityIndicatorView!.hidesWhenStopped = true

            m_objActivityIndicatorView!.color = UIColor.blackColor()

            m_objActivityIndicatorView!.layer.cornerRadius = 6

            m_objActivityIndicatorView!.layer.masksToBounds = true

            self.view.addSubview(m_objActivityIndicatorView)