Access struct through class instance

Question

In a class I created I have a struct called Image:

public struct Image {


 private(set) var url: String
 private(set) var crop: CGRect

    init(url: String, crop: CGRect) {
        self.url = url
        self.crop = crop
    }
}

I also have a function that usesImage as a parameter.

public func detectBoxes(image: Image) {
    //some code
}

What I want to do is access Image in another file to use it in a function. So, I create an instance of the class and try typing

instance.detectBoxes(image: ...)

BUT it won't let me create an instance of Image so I can use it, it just wants me to type Class.Image which doesn't make sense.

Does anyone know how to solve my issue? Any help would be much appreciated. Cheers, Theo

Is your struct declared inside the class declaration (i.e. a nested declaration)? Or are they just defined in the same file? — paulvs
– paulvs, Commented Jul 17, 2017 at 16:30

Shai Balassiano · Accepted Answer · 2017-07-17 16:30:18Z

1

You defined a nested struct inside of a class, meaning it's available from within the class context.

If you wish to just use an instance of type Image and not <ClassName>.Image you must move the declaration of the struct out side the scope of the class.

answered Jul 17, 2017 at 16:30

Shai Balassiano

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3 Comments

Theo Strauss Over a year ago

thanks so much! I did what you suggested but when I try to make an instance of it in my other file by doing var imageInstance = Image( it doesn't autocomplete to be Image(url: String, crop: CGRect). Do you know what's up with that. Once I get that working I'm golden. I'll definitely give you the check mark if you can fix that

Theo Strauss Over a year ago

i realized that my init() function wasn't public, so I made it so, but it still doesn't work. I'm getting the error when I type var imageInstace = Image(url: "blah", crop: "blah"), 'Image' initializer is inaccessible due to 'internal' protection level

henrique Over a year ago

Just an observation, you don't have to declare "default" init for structs, only classes. If you writestruct A { var x = 0 } it automatically has a A(x: Int) init.

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