SwiftUI - Button - How to pass a function request to parent - button

Question

How can I have a button perform an action which triggers a function in its 'parent' view? I'm trying to refactor my code so that components are as small as possible.
In this case, the button performs a few tasks, but one of them is to run a function:
Button(
action: {
self.setViewBackToNil()
}){
Text("Button")
}
// which triggers a function
func setViewBackToNil(){
self.userData.image = nil
self.isProcessing = false
.... etc
}
Now, if I turn the button into its own view, I can't pass self.setViewBackToNil because it's contained within the struct of the parent.
Is there a way for a component to trigger a function within its parent?

Answer 1

The best examples on closures and how they can be used is found in the official swift documentation.
This is a small example on how to pass a closure to your child view which then calls a function of the parent:
struct ChildView: View {
var function: () -> Void
var body: some View {
Button(action: {
self.function()
}, label: {
Text("Button")
})
}
}
struct ParentView: View {
var body: some View {
ChildView(function: { self.fuctionCalledInPassedClosure() })
}
func fuctionCalledInPassedClosure() {
print("I am the parent")
}
}
I hope this helps!
Pass a function
And here is an example to pass the function:
struct ChildView: View {
var function: () -> Void
var body: some View {
Button(action: {
self.function()
}, label: {
Text("Button")
})
}
}
struct ParentView: View {
var body: some View {
ChildView(function: self.passedFunction)
}
func passedFunction() {
print("I am the parent")
}
}
Pass a function with parameters
struct ChildView: View {
var myFunctionWithParameters: (String, Int) -> Void
var body: some View {
Button(action: {
self.myFunctionWithParameters("parameter", 1)
}, label: {
Text("Button")
})
}
}
struct ParentView: View {
var body: some View {
ChildView(myFunctionWithParameters: self.passedFunction)
}
func passedFunction(myFirstParameter: String, mySecondParameter: Int) {
print("I am the parent")
}
}