Im my case, this happened when I did incorrect static initialization in a protocol. I found a way to get around, but a compiler should *never* produce a segmentation fault while building.
There are three files involved. A protocol NamedSegues.swift, a custom TableViewController that among other things implements the protocol which contains a callback, a custom TableViewCell that holds reference to this protocol to call the callback.
//file1
import Foundation
protocol NamedSegues {
func executeSegueWithId(id: String) -> Void
static func getDefault() -> NamedSegues // This was required because of init requirement in CustomCellView
}
//file2
class CustomController: UITableViewController, NamedSegues {
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("CustomCellID", forIndexPath: indexPath ) as! CustomCellView
// Configure the cell...
//App logic...
cell.parent = self
}
//Mark: NamedSegues
func executeSegueWithId(id: String) ->() {
NSLog("Received callback to execute segue: \(id)")
//
}
static func getDefault() -> NamedSegues { // I think this must be where it threw up.
return self as! NamedSegues
}
}
//file3
import UIKit
class CustomCellView: UITableViewCell {
var id: String = "NoName"
var parent: NamedSegues = NamedSegues.getDefault() // This is where it was needed.
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
NSLog("Touched id: \(id)")
parent.executeSegueWithId(id) // This is where parent was used.
}
}
I got around it by using ?
In the protocol file, file1: delete the declaration of getDefault()
In the CustomController file2: delete the implementation of getDefault.
In the CustomCellView, file3:
var parent: NamedSegues?
...
parent?.executeSegueWithId(id)
The compiler should have caught this and given some error message instead of throwing a segmentation fault during build!
]
