So I just started on Challenge 4 of Module 2 and I am getting the following errors. Cannot find ‘action’ in scope, consecutive statements on a line must be separated by ‘;’
Insert ‘;’
Expected expression
Any Advice?
//
// ContentView.swift
// Shared
//
// Created by Eric Beecroft on 10/6/21.
//
import SwiftUI
struct ContentView: View {
var body: some View {
VStack{
Button("1"){ action: numberList = Integer.random(1...10)
List(numberList in array)
}
Button("2"){ action: //Increase all numbers when tapped
List(numberList in array ++)
}
Button("3"){action: numberList.removeAll()
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Your button can look like this instead of how you have it written
Button {
// action code here
} label: {
Text(“1”)
}
Change:
to:
Button("1") {
numberList = Int.random(in: 1...10)
}
Integer is not a type in Swift; Int is.- What are you doing with this line:
List(numberList in array)? You can’t have a List inside tha action closure of a Button and where does array come from?
Charles,
You have a number of active threads in the Code Crew community. One each for Module 2 challenges 2, 3 and 4 and a couple of others for the 14 day Challenge. I would recommend that you deal with one at a time because the understanding that you gain in one challenge has a bearing on the next.
With reference to the above code, you can’t place a List() inside a button.
The challenge says to create a UI with a List and 3 Buttons below it, so in very basic terms it should look like this:
VStack {
List
Button
Button
Button
}
I decided to reduce the code down to a few buttons. Right now I am getting the error message that the numberList is out of scope.
//
// ContentView.swift
// Shared
//
// Created by Eric Beecroft on 10/6/21.
//
import SwiftUI
struct ContentView: View {
var body: some View {
VStack{
Button("1"){ numberList = Int.random(1...10)
}
Button("2"){
}
Button("3"){
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
That is something I didn’t know, I thought that was something you can do in Swift.
Consider changing it to a let
struct ContentView: View {
var body: some View {
VStack{
Button("1") {
let numberList = Int.random(1...10)
}
Button("2"){
}
Button("3"){
}
}
}
}
I added the let statement and I am now getting an error message that reads “Missing argument label ‘in:’ in call”
Any advice?
//
// ContentView.swift
// Shared
//
// Created by Eric Beecroft on 10/6/21.
//
import SwiftUI
struct ContentView: View {
var body: some View {
VStack{
Button("1"){
let numberList = Int.random(1...10)
}
Button("2"){
}
Button("3"){
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Did you try clicking on the fix it offered by Xcode? That will often correct the error for you.
In this case, Int.random(1...10) should be Int.random(in: 1...10)
1 Like
It fixed it. I looked at the answer but I don’t know how they came up with it. I am kind of struggling to understand the answer.
import SwiftUI
struct ContentView: View {
// Stores our generated numbers
@State var numbers = [Int]()
var body: some View {
VStack {
// For each number, create a text element
List(numbers, id: \.self) { num in
Text(String(num))
}
HStack(spacing: 10.0) {
Button("Generate") {
// Declare a variable outside the scope of the loop
var randNumber = 0
// Loop
repeat {
// Randomize a number
randNumber = Int.random(in: 1...10)
// Add it to our array
numbers.append(randNumber)
// If it's not a 7, then loop
} while randNumber != 7
}
.padding()
.background(Color.blue)
.cornerRadius(10)
Button("Add +1") {
// Check if there are items in the array
if numbers.count == 0 {
// The return keyword will cause execution to stop and return (skipping all the code below the return keyword)
return
}
// Loop through the array
for index in 0...numbers.count-1 {
// Increment it by 1
numbers[index] += 1
}
}
.padding()
.background(Color.blue)
.cornerRadius(10)
Button("Clear") {
numbers.removeAll()
}
.padding()
.background(Color.blue)
.cornerRadius(10)
}
.foregroundColor(.white)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
What don’t you understand?
I don’t get how they were able to add the list to the view. As from my understanding of the lesson that was something that wouldn’t have been able to be put in a VStack or HStack. How do I go from the code I have to the solution?
From this
//
// ContentView.swift
// Shared
//
// Created by Eric Beecroft on 10/6/21.
//
import SwiftUI
struct ContentView: View {
var body: some View {
VStack{
Button("1"){
let numberList = Int.random(in: 1...10)
}
Button("2"){
}
Button("3"){
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
To this
//
// ContentView.swift
// Module2Challenge4Solution
//
// Created by Eric Beecroft on 10/22/21.
//
import SwiftUI
struct ContentView: View {
@State var numbers = [Int]()
var body: some View {
VStack{
List(numbers, id: \.self){ num in
Text(String(num))
}
HStack(spacing: 10.0){
Button("Generate"){
var randNumber = 0
repeat{
randNumber = Int.random(in: 1...10)
numbers.append(randNumber)
}
while randNumber != 7
}.padding().background(Color.blue).cornerRadius(10)
Button("Add +1"){
if numbers.count == 0{
return
}
for index in 0...numbers.count-1{
numbers[index] += 1
}
}.padding().background(Color.blue).cornerRadius(10)
Button("Clear"){
numbers.removeAll()
}.padding().background(Color.blue).cornerRadius(10)
}.foregroundColor(.white)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
1 Like