Why when converting Float to CGFloat Xcode give me a warning "Cannot convert value of type 'CGFloat' to expected argument type 'UnsafeMutablePointer"?

Question

I am trying to convert a Float value to CGFloat Value, here my code:

    let myFloatForR = 0
    let r = CGFloat(myFloatForR) 
    let myFloatForG = 0
    let g = CGFloat(myFloatForG)
    let myFloatForB = 0
    let b = CGFloat(myFloatForB)
    let myFloatForA = 0
    let a = CGFloat(myFloatForA)
    tintColor.getRed(r, green:&g, blue:&b, alpha:&a)

but suddenly the Xcode gives me a warning says: "Cannot convert value of type 'CGFloat' to expected argument type 'UnsafeMutablePointer" on the "tintColor" line? Anyone can help me?

Solution

You need to change the CGFloat objects as var instead of let and pass pointer object for red value in getRed method.

Updated Code

let myFloatForR = 0
var r = CGFloat(myFloatForR)
let myFloatForG = 0
var g = CGFloat(myFloatForG)
let myFloatForB = 0
var b = CGFloat(myFloatForB)
let myFloatForA = 0
var a = CGFloat(myFloatForA)
tintColor.getRed(&r, green:&g, blue:&b, alpha:&a)

OR

You can optimize your code after declaring r, g, b and a using single line of code.

var r: CGFloat = 0, g: CGFloat = 0, b: CGFloat = 0, a: CGFloat = 0
tintColor.getRed(&r, green:&g, blue:&b, alpha:&a)