Simple Quantizer

ViewController.swift

//
//  ViewController.swift
//  quant
//


import Foundation
import UIKit

@objc class ViewController : UIViewController {
 
    var bpm:NSTimeInterval = 100
    var currentBeat = 0
    
    override func viewDidLoad() {
        super.viewDidLoad()
        NSTimer.scheduledTimerWithTimeInterval(60 / (self.bpm*16), target: self, selector: "timerFired", userInfo: nil, repeats: true)
    }
    
    @IBOutlet weak var segmentedControl: UISegmentedControl!
    
    func timerFired() {
        
        currentBeat += 1
        currentBeat = currentBeat % segmentedControl.numberOfSegments
        
        segmentedControl.selectedSegmentIndex = currentBeat
        if currentBeat % 16 == 0 {
            segmentedControl.tintColor = UIColor.redColor()
        } else {
            segmentedControl.tintColor = UIColor.purpleColor()
        }
        
    }
    
    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        let image = getImageWithColor(UIColor.grayColor(), size: CGSizeMake(28, 28))
        segmentedControl.setImage(image, forSegmentAtIndex: segmentedControl.selectedSegmentIndex)
    }
    
    func getImageWithColor(color: UIColor, size: CGSize) -> UIImage {
        var rect = CGRectMake(0, 0, size.width, size.height)
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        color.setFill()
        UIRectFill(rect)
        var image: UIImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}