CODEWITHSUNDEEP
iosxcodeswift
AJ_1310
AJ_1310

Reputation: 3443

Functions returns error about overloading operator

This code when I assign the parameter alpha to the function implementation it displays the error Could not find a an overload for '/' that accepts the supplied arguments, but if i set alpha to 1.0 the error disappears.

What could be causing this?

import Foundation
import UIKit

extension UIColor {

  enum AlphaLevel :CGFloat {
    case Empty  = 0.0
    case Low    = 0.25
    case Half   = 0.5
    case High   = 0.75
    case Full   = 1.0
  }

  class func hazeColor(alpha :AlphaLevel = .Full) -> UIColor! {
    return UIColor(red: 230/255.0, green: 235/255.0, blue: 245/255.0, alpha: alpha)
  }

}

I'm enlisting the attempts I've tried:

class func hazeColor(alpha :AlphaLevel = .Full) -> UIColor! {
    return UIColor(red: Float(230)/255.0, green: Float(235)/255.0, blue: Float(245)/255.0, alpha: alpha)
  }

Upvotes: 0

Views: 97

Answers (1)

onevcat
onevcat

Reputation: 4631

It will be OK to use 230/255.0, because the type of the number will be determined after the calculation. If you assign the two number to a variable (or constant), you will be have to convert them before calculating. So there is no problem in the 230/255.0. (And in fact, CGFloat is a Double..not a Float)

It seems there is a fatal bug for me to define the AlphaLevel enum in the extension of UIColor. Swift will crash if I do so (although it should be possible). Anyway...

The problem in your code is the alpha you passed into the hazeColor method is a enum of AlphaLevel, instead of CGFloat, so the type check failed. Just modify the UIColor(red: 230/255.0, green: 235/255.0, blue: 245/255.0, alpha: alpha) to UIColor(red: 230/255.0, green: 235/255.0, blue: 245/255.0, alpha: alpha.toRaw()), you can get around.

Upvotes: 1

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