How to pass variables functions in forEach loops - swift

Question

Goal:
I am currently working on some code to create a grid of hexagons, each one individually coloured with a gradient. However I am quite new to swiftUI and don't fully understand why my code doesn't work.
Code:
ForEach(0 ..< 11, id: \.self) { Xnum in
ForEach(0 ..< 11, id: \.self) { Ynum in
self.MyNewPath(in: CGRect(), Xcoord: Double(Xnum), Ycoord: Double(Ynum), Type: 1)
.fill(RadialGradient(
gradient: Gradient(colors: [Color.red, Color.blue]),
center: .init(
x: self.gradientParametersX(Xpos: Double(Xnum)),
y: self.gradientParametersY(Ypos: Double(Ynum), Xpos: Double(Xnum))),
startRadius: CGFloat(2.0),
endRadius: CGFloat(70.0)))
.gesture(
TapGesture().onEnded {_ in
self.dataEditor(Xplace: Int(Xnum), Yplace: Int(Ynum))
}
)
}
}
Return Types:
MyNewPath() - Path (of a hexagon)
gradientParametersY() - CGFloat
gradientParametersY() - CGFloat
Error:
The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions
The error appears to be centred around the passing of Xnum and Ynum to functions gradientParametersX() and gradientParametersY().
When I pass 7.0 and 0.0 for example:
x: self.gradientParametersX(Xpos: Double(7.0)),
y: self.gradientParametersY(Ypos: Double(0.0), Xpos: Double(7.0))),
...there is no error.

Answer 1

Try to separate grid item creation in separate function as below (the code snapshot is not testable, so just scratchy to demo idea)
...
ForEach(0 ..< 11, id: \.self) { Xnum in
ForEach(0 ..< 11, id: \.self) { Ynum in
self.createItem(for: Xnum, Ynum: Ynum)
}
}
...
private func createItem(for Xnum: Int, Ynum: Int) -> some View {
self.MyNewPath(in: CGRect(), Xcoord: Double(Xnum), Ycoord: Double(Ynum), Type: 1)
.fill(RadialGradient(
gradient: Gradient(colors: [Color.red, Color.blue]),
center: .init(
x: self.gradientParametersX(Xpos: Double(Xnum)),
y: self.gradientParametersY(Ypos: Double(Ynum), Xpos: Double(Xnum))),
startRadius: CGFloat(2.0),
endRadius: CGFloat(70.0)))
.gesture(
TapGesture().onEnded {_ in
self.dataEditor(Xplace: Int(Xnum), Yplace: Int(Ynum))
}
)
}

Answer 2

EDIT : Does your answer concerns SwiftUI and not just Swift ? If yes, please edit your question, and see user3441734 comment under it.
The compilator seems to have troubles deducing the types of Xnum and Ynum.
You might have to explicitly write their type.
Your ForEach syntax seems quite weird, have you tried
for Xnum:Int in 0..<11
{
for Ynum:Int in 0..<11
{
}
}
And then casting Xnum and Ynum to Double ?
You can also directly do a foreach on doubles this way :
for Xnum:Double in stride(from: 0, through: 10, by: 1.0)
{
for Ynum:Double in stride(from: 0, through: 10, by: 1.0)
{
}
}