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iOS Object-Oriented Swift 2.0 Complex Data Structures Custom Initializers

Posted by Billy Potts
Billy Potts
Courses Plus Student 2,344 Points

how do i create my own custom initializer

how do i create a custom initializer and not swifts member wise one

structs.swift 
struct RGBColor {
    let red: Double
    let green: Double
    let blue: Double
    let alpha: Double

    let description: String

    // Add your code below
    init(red: Double, green: Double,blue: Double,alpha: Double, description: String) {
        self.red = 86.0
       self.green = 191.0
       self.blue = 131.0
        self.alpha = 1.0
       self.description = "red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0"
    }
}

2 Answers

omarelamrieado
omarelamrieado
18,473 Points
omarelamrieado
omarelamrieado
18,473 Points

Use a class, classes do not have an automatic member wise initializer. Also, they support inheritance, more the reason to use a class. If any of this sounds like jibberish, continue with the Object Oriented Swift course, as it will teach you more about structs and classes.

Edit:

Oh, I did not know that this was a challenge that specifies that you need a struct, please disregard.

Billy Potts
Billy Potts
Courses Plus Student 2,344 Points

yea i don't understand and it won't let me move on until i complete this task

omarelamrieado
omarelamrieado
18,473 Points

Look at the answer below.

omarelamrieado
omarelamrieado
18,473 Points
omarelamrieado
omarelamrieado
18,473 Points

Real answer this time:

init(red: Double, green: Double, blue: Double, alpha: Double) {
    self.red = red
    self.green = green
    self.blue = blue
    self.alpha = alpha
    self.description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"
    }

You were on the right track, but the values Pasan Premaratne provided were only for an example.
So, instead of having a fixed values for an object, (having fixed values defeats the the purpose of Object Oriented Programming) set them to the attributes of the instance.
For the description, same case. Instead of a fixed description, interpolate the default string to have the attributes of the object.