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iOS

Fun facts app adding a pop of color crashing. HELP!

Help!

I followed the code verbatim and it crashes in the simulator. The return line is highlighted on the ColorWheel page with a green band that reads "Thread:1 breakpoint 2.1" on the extreme right. Here is my code: Could somebody please help? I can't move on until I solve this.

import Foundation
import UIKit

struct ColorWheel {

    let colorsArray = [
        UIColor(red: 90/255.0, green: 187/255.0, blue: 181/255.0, alpha: 1.0), //teal color
        UIColor(red: 222/255.0, green: 171/255.0, blue: 66/255.0, alpha: 1.0), //yellow color
        UIColor(red: 223/255.0, green: 86/255.0, blue: 94/255.0, alpha: 1.0), //red color
        UIColor(red: 239/255.0, green: 130/255.0, blue: 100/255.0, alpha: 1.0), //orange color
        UIColor(red: 77/255.0, green: 75/255.0, blue: 82/255.0, alpha: 1.0), //dark color
        UIColor(red: 105/255.0, green: 94/255.0, blue: 133/255.0, alpha: 1.0), //purple color
        UIColor(red: 85/255.0, green: 176/255.0, blue: 112/255.0, alpha: 1.0), //green color
    ]

    func randomColor() -> UIColor {
        var unsignedArrayCount = UInt32(colorsArray.count)
        var unsignedRandomNumber = arc4random_uniform(unsignedArrayCount)
        var randomNumber = Int (unsignedRandomNumber)

        return colorsArray[randomNumber]
    }
}

What is the output on the console?