ios Swift 错误：源文件中的编辑器占位符
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Swift Error: Editor placeholder in source file
提问by Lucas Crostarosa
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"
你好，我正在实现一个图形数据结构。当我尝试构建应用程序时，我收到错误“源文件中的编辑器占位符”
The full graph implementation was pulled from WayneBishop's GitHub from here https://github.com/waynewbishop/SwiftStructures
完整的图实现是从这里https://github.com/waynewbishop/SwiftStructures从 WayneBishop 的 GitHub 中提取的
class Path {
var total: Int!
var destination: Node
var previous: Path!
init(){
//Error happens on next line
destination = Node(key: String?, neighbors: [Edge!], visited: Bool, lat: Double, long: Double)
}
}
I changed the NodeClass around to:
我将Node班级改为：
public class Node{
var key: String?
var neighbors: [Edge!]
var visited: Bool = false
var lat: Double
var long: Double
init(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.
到目前为止，在我构建的代码中，此错误发生了 5 次。也有人问过这个问题，但没有回答。
I think the error may be due to my changes to the init()in the Nodeclass. 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.
我认为错误可能是由于我init()对Node课堂上的更改造成的。在我更改之前，它只是init(). 如果是，我如何将对象添加到类中？如果我的编程术语不正确，请原谅我，因为我对 OOP 比较陌生。
采纳答案by David Yang Liu
you had this
你有这个
destination = Node(key: String?, neighbors: [Edge!], visited: Bool, lat: Double, long: Double)
which was place holder text above you need to insert some values
这是上面的占位符文本，您需要插入一些值
class Edge{
}
public class Node{
var key: String?
var neighbors: [Edge]
var visited: Bool = false
var lat: Double
var long: Double
init(key: String?, neighbors: [Edge], visited: Bool, lat: Double, long: Double) {
self.neighbors = [Edge]()
self.key = key
self.visited = visited
self.lat = lat
self.long = long
}
}
class Path {
var total: Int!
var destination: Node
var previous: Path!
init(){
destination = Node(key: "", neighbors: [], visited: true, lat: 12.2, long: 22.2)
}
}
回答by Vishal Chaudhry
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.
有时，即使您已将其替换为值，XCode 也不会忘记具有“编辑器占位符”的行。剪切 XCode 抱怨的代码部分并将代码粘贴回同一位置以使错误消息消失。这对我有用。
回答by Ahtazaz
After Command + Shift + B, the project works fine.
Command + Shift + B 后，项目运行正常。
回答by KingKongCoder
Clean Build folder + Build
清理构建文件夹 + 构建
will clear any error you may have even after fixing your code.
即使在修复代码后，也会清除您可能遇到的任何错误。
回答by XpressGeek
Go to Product> Clean Build Folder
转到产品>清理构建文件夹
回答by Vishnu gondlekar
Error is straight forward and its because of wrong placeholders you have used in function call. Inside inityou are not passing any parameters to your function. It should be this way
错误是直接的，这是因为您在函数调用中使用了错误的占位符。在内部，init您没有将任何参数传递给您的函数。应该是这样
destination = Node("some key", neighbors: [edge1 , edge2], visited: true, lat: 23.45, long: 45.67) // fill up with your dummy values
Or you can just initialise with default method
或者您可以使用默认方法进行初始化
destination = Node()
UPDATE
更新
Add empty initialiser in your Node class
在您的 Node 类中添加空的初始化程序
init() {
}
回答by Cihan Necmi Gunal
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
如果您在使用视图控制器而不是 UI 元素创建 segue 时遇到此错误，则必须更改sender: Any?为此
@IBAction func backButtonPressed(_ sender: Any) {
performSegue(withIdentifier: "goToMainScreen", sender: self)
}
It will work.
它会起作用。
