I have a 2d array with custom types.
I'd like to do something like:
HStack {
ForEach(2dArray) { x in
VStack {
ForEach(self.2dArray[x.index]) { y in
The main issue I have is that I can't figure out how to get x.index.
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4 Answers
So I was going to say you should do this to iterate a 2D array:
var data = [[1,2,3],[4,5,6],[7,8,9]]
ForEach(data.identified(by: \.self)) { array in
ForEach(array.identified(by: \.self)) { element in
Text("\(element)")
}
}
but XCode 11 beta is still very buggy with SwiftUI and type inference, so you get a compiler error for doing that, even though it should work. So for now, you'll have to separate everything into functions that the XCode compiler can handle, but with the complex types that SwiftUI uses, it gets ugly very fast. Here is an example:
var data = [[1,2,3],[4,5,6],[7,8,9]]
var body: some View {
doubleForEach(data: data)
}
func doubleForEach(data: [[Int]]) -> ForEach<IdentifierValuePairs<[[Int]], [Int]>,ForEach<IdentifierValuePairs<[Int], Int>, Text>> {
return ForEach(data.identified(by: \.self)) { row in
self.foreach(dataArr: row)
}
}
func foreach(dataArr: [Int]) -> ForEach<IdentifierValuePairs<[Int], Int>, Text> {
return ForEach(dataArr.identified(by: \.self)) { data in
Text("\(data)")
}
}
Which looks like this:
2 Comments
thekodols
Ohhh...k. I think I'm following; I'll try to implement this. Thank you!
RPatel99
No problem! And as mimo said, you might want to see if the code that didn't work for me works for you, since Xcode 11's buggy compiler can give false errors on a case by case basis. If it doesn't work then you should go the ugly functions route, at least until you can clean it up later when Apple starts releasing Xcode 11 updates.
var data = [[1,2,3],[4,5,6],[7,8,9]]
struct ContentView : View {
var body: some View {
VStack {
ForEach(data, id: \.self) { array in
HStack{
ForEach(array, id: \.self) { element in
Text("\(element)")
}
}
}
}
}
}
Comments
actually the example RPatel99 postet in the earlier response works fine for me:
var data = [[1,2,3],[4,5,6],[7,8,9]]
struct ForTesting : View {
var body: some View {
VStack {
ForEach(data.identified(by: \.self)) { array in
ForEach(array.identified(by: \.self)) { element in
Text("\(element)")
}
}
}
}
}
But was this your problem?
3 Comments
RPatel99
Thanks for the info! But this post would probably work better as a comment on my answer than as a separate answer.
thekodols
It works. I just needed to (1) change self.2dArray[x.index] to just the array I get from the first ForEach. (2) make my types hashable to be able to use .self. Thanks for the help!
mimo
thanks. in fact I wanted to do this as a comment but was not yet able to do comments (reputation < 50)
struct ContentView : View {
var body: some View {
VStack {
ForEach(data.identified(by: \.self)) { array in
HStack{
ForEach(array.identified(by: \.self)) { element in
Text("\(element)")
}
}
}
}
}
}
