SwiftUI Calling functions from other class

Question

I am having a little trouble here: I have a class

class TempC {
    func GetData(){
          //do stuff
    }
}

And in ContentView I want to call the function, but I can't manage to do it, I am getting errors...

struct ContentView: View {

var variable : TempC
variable.GetData()
var body: some View {
        Text("Hello World")
    }
}

Or in any other method. How can I call an external function now?

PS: The error that I get are on the line with variable.GetData() which are:

Consecutive declarations on a line must be separated by ";"

Expected "("in argument list of cantons declaration

Expected "{"in body of function declaration

Expected 'func' keyword in instance method declaration

Invalid redeclaration of 'variable()'

It's like it is expecting to create a new function not to get the one that is already existing.

Martijn Pieters · Accepted Answer · 2022-08-23 13:38:15Z

31

Depending on what your going to do in that call there are options, ex:

Option 1

struct ContentView: View {

    let variable = TempC()
    init() {
        variable.GetData()
    }
    var body: some View {
            Text("Hello World")
    }
}

Option 2

struct ContentView: View {

    let variable = TempC()

    var body: some View {
        Text("Hello World")
        .onAppear {
            self.variable.GetData()
        }
    }
}

Similarly you can call it in .onTapGesture or any other, pass reference to your class instance during initialising, etc.

edited Aug 23, 2022 at 13:38

Martijn Pieters

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answered Nov 15, 2019 at 20:04

Asperi

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2 Comments

Blaj Bogdan Over a year ago

Good response! Was used with the UIKIT style of calling functions and methods, here I see I need to make an action or something.

TechAV Over a year ago

What if variable.GetData() return a tuple then how to access it in var body: some View

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