Hello I am implementing a graph data structure. When I try to build the application the I get the error "Editor placeholder in source file"
The full graph implementation was pulled from WayneBishop's GitHub from here https://github.com/waynewbishop/SwiftStructures
class Path {var total: Int!var destination: Nodevar previous: Path!init(){//Error happens on next linedestination = Node(key: String?, neighbors: [Edge!], visited: Bool, lat: Double, long: Double)}}I changed the Node Class around to:
public class Node{var key: String?var neighbors: [Edge!]var visited: Bool = falsevar lat: Doublevar long: Doubleinit(key: String?, neighbors: [Edge!], visited: Bool, lat: Double, long: Double) {self.neighbors = [Edge!]()}}This Error happens 5 times throughout the code that I have built so far. Also this question has been asked, but not answered.
I think the error may be due to my changes to the init() in the Node class. Prior to my changes it was just init(). If it is, how can I add objects to the class? Pardon me if I am not correct in my programming terminology, as I am relatively new to OOP.
Best Answer
Sometimes, XCode does not forget the line which had an "Editor Placeholder" even if you have replaced it with a value. Cut the portion of the code where XCode is complaining and paste the code back to the same place to make the error message go away. This worked for me.
Editor placeholders are an essential element in source files used by programmers. They serve as temporary markers that indicate areas where specific code or information needs to be added later. These placeholders are typically used when multiple developers are working on the same codebase or when certain parts of the code are yet to be implemented.
By using editor placeholders, developers can easily identify the sections that require attention and ensure that they do not miss any crucial code. These placeholders act as reminders and enable seamless collaboration among team members. They also help in maintaining the overall structure and integrity of the codebase.
Editor placeholders are usually indicated by specific syntax or predefined keywords that are recognized by code editors or integrated development environments (IDEs). This allows the editor to highlight or provide suggestions for the missing code or information. It also helps in minimizing errors and improving the efficiency of the development process.
In conclusion, editor placeholders play a crucial role in source files by indicating areas where specific code or information needs to be added. They enhance code development and collaboration, ensuring that no crucial elements are missed. By using these placeholders, developers can easily identify and work on the required sections, improving the overall efficiency and integrity of the codebase.
After Command + Shift + B, the project works fine.
Go to Product > Clean Build Folder
you had this
destination = Node(key: String?, neighbors: [Edge!], visited: Bool, lat: Double, long: Double)which was place holder text above you need to insert some values
class Edge{}public class Node{var key: String?var neighbors: [Edge]var visited: Bool = falsevar lat: Doublevar long: Doubleinit(key: String?, neighbors: [Edge], visited: Bool, lat: Double, long: Double) {self.neighbors = [Edge]()self.key = keyself.visited = visitedself.lat = latself.long = long}}class Path {var total: Int!var destination: Nodevar previous: Path!init(){destination = Node(key: "", neighbors: [], visited: true, lat: 12.2, long: 22.2)}}Error is straight forward and its because of wrong placeholders you have used in function call. Inside init you are not passing any parameters to your function. It should be this way
destination = Node("some key", neighbors: [edge1 , edge2], visited: true, lat: 23.45, long: 45.67) // fill up with your dummy valuesOr you can just initialise with default method
destination = Node()UPDATE
Add empty initialiser in your Node class
init() {}I had the same issue. This works for me:
- Product -> Build Clean Folder
- Product -> Build
Clean Build folder+Build
will clear any error you may have even after fixing your code.
In my case, using Item instead of item was causing the problem, here's come with a comment
struct AspectVGrid<Item, ItemView>: View where ItemView: View, Item: Identifiable {var items: [Item]var aspectRatio: CGFloatvar content: (Item) -> ItemViewvar body: some View {let width: CGFloat = 100LazyVGrid(columns: [GridItem(.adaptive(minimum: width))]) {ForEach(items) { item in// using Item instead of item caused the problemcontent(Item).aspectRatio(aspectRatio,contentMode: .fit)}}}}If you have this error while you create segues with the view controllers not with the UI elements you have to change sender: Any? to this
@IBAction func backButtonPressed(_ sender: Any) {performSegue(withIdentifier: "goToMainScreen", sender: self)}It will work.