MKMapViewDelegate Command failed due to signal: Segmentation fault: 11 - ios

Question

i have a very weird problem with a MKMapViewDelegate when i implement this method give me an error that i do not understand
The error only disappear when i delete the whole function,
i tried to make a empty function returning nil but give me the same error.
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
if annotation.isKindOfClass(MKUserLocation.classForCoder()) {
return nil
}
let AnnotationIdentifier:NSString = "AnnotationIdentifier"
var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(AnnotationIdentifier)
if annotationView != nil {
return annotationView
}else {
var annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: AnnotationIdentifier)
annotationView.canShowCallout = true
annotationView.image = UIImage(named: "btn_fav.png")
return annotationView
}
}
The error:
Command failed due to signal: Segmentation fault: 11
CompileSwift normal arm64 /Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Vistas/Proyecto/MapaViewController.swift
cd /Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c "/Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Classes/NetClass/Downloader.swift" -primary-file "/Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Vistas/Proyecto/MapaViewController.swift" "/Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Vistas/Widget/ToggleView.swift" .
.
.
.
0 swift 0x00000001019df028 llvm::sys::PrintStackTrace(__sFILE*) + 40
1 swift 0x00000001019df514 SignalHandler(int) + 452
2 libsystem_platform.dylib 0x00007fff9a2dc5aa _sigtramp + 26
3 libsystem_platform.dylib 000000000000000000 _sigtramp + 1708276336
4 swift 0x0000000100fe90ea swift::ClangImporter::Implementation::loadAllMembers(swift::Decl const*, unsigned long long, bool*) + 3130
5 swift 0x0000000101da2834 swift::IterableDeclContext::loadAllMembers() const + 100
6 swift 0x0000000101d995dc swift::NominalTypeDecl::getMembers(bool) const + 28
7 swift 0x0000000101dc029f swift::NominalTypeDecl::lookupDirect(swift::DeclName) + 79
8 swift 0x0000000101dbe96a swift::DeclContext::lookupQualified(swift::Type, swift::DeclName, unsigned int, swift::LazyResolver*, llvm::SmallVectorImpl<swift::ValueDecl*>&) const + 3146
9 swift 0x0000000100fe5941 (anonymous namespace)::SwiftDeclConverter::VisitObjCPropertyDecl(clang::ObjCPropertyDecl const*, swift::DeclContext*) + 161
10 swift 0x0000000100fe0d0d clang::declvisitor::Base<clang::declvisitor::make_const_ptr, (anonymous namespace)::SwiftDeclConverter, swift::Decl*>::Visit(clang::Decl const*) + 3117
11 swift 0x0000000100fe005b swift::ClangImporter::Implementation::importDeclImpl(clang::NamedDecl const*, bool&, bool&) + 331
12 swift 0x0000000100fe4912 swift::ClangImporter::Implementation::importDeclAndCacheImpl(clang::NamedDecl const*, bool) + 226
13 swift 0x0000000100fe879e swift::ClangImporter::Implementation::loadAllMembers(swift::Decl const*, unsigned long long, bool*) + 750
14 swift 0x0000000101da2834 swift::IterableDeclContext::loadAllMembers() const + 100
15 swift 0x0000000101d99a95 swift::ExtensionDecl::getMembers(bool) const + 21
16 swift 0x0000000101dc027d swift::NominalTypeDecl::lookupDirect(swift::DeclName) + 45
17 swift 0x0000000101dbe96a swift::DeclContext::lookupQualified(swift::Type, swift::DeclName, unsigned int, swift::LazyResolver*, llvm::SmallVectorImpl<swift::ValueDecl*>&) const + 3146
18 swift 0x0000000101cc6288 swift::TypeChecker::lookupMember(swift::Type, swift::DeclName, swift::DeclContext*, bool) + 200
19 swift 0x0000000101c34e2c swift::constraints::ConstraintSystem::lookupMember(swift::Type, swift::DeclName) + 220
20 swift 0x0000000101c6b32d swift::constraints::ConstraintSystem::simplifyMemberConstraint(swift::constraints::Constraint const&) + 2173
21 swift 0x0000000101c6dc88 swift::constraints::ConstraintSystem::simplifyConstraint(swift::constraints::Constraint const&) + 216
22 swift 0x0000000101c354bc swift::constraints::ConstraintSystem::addConstraint(swift::constraints::Constraint*, bool, bool) + 28
23 swift 0x0000000101c5a8a5 swift::ASTVisitor<(anonymous namespace)::ConstraintGenerator, swift::Type, void, void, void, void, void>::visit(swift::Expr*) + 9317
24 swift 0x0000000101c5c502 (anonymous namespace)::ConstraintWalker::walkToExprPost(swift::Expr*) + 162
25 swift 0x0000000101d6627f (anonymous namespace)::Traversal::visit(swift::Expr*) + 6431
26 swift 0x0000000101d62765 swift::Expr::walk(swift::ASTWalker&) + 53
27 swift 0x0000000101c583b0 swift::constraints::ConstraintSystem::generateConstraints(swift::Expr*) + 96
28 swift 0x0000000101c90ab6 swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::Type, bool, swift::FreeTypeVariableBinding, swift::ExprTypeCheckListener*) + 518
29 swift 0x0000000101cd73e3 swift::ASTVisitor<(anonymous namespace)::StmtChecker, void, swift::Stmt*, void, void, void, void>::visit(swift::Stmt*) + 291
30 swift 0x0000000101cd64c3 swift::TypeChecker::typeCheckFunctionBodyUntil(swift::FuncDecl*, swift::SourceLoc) + 371
31 swift 0x0000000101cd6b8f swift::TypeChecker::typeCheckAbstractFunctionBody(swift::AbstractFunctionDecl*) + 95
32 swift 0x0000000101c86b65 typeCheckFunctionsAndExternalDecls(swift::TypeChecker&) + 421
33 swift 0x0000000101c87476 swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, unsigned int) + 1734
34 swift 0x0000000100fc07dd swift::CompilerInstance::performSema() + 2253
35 swift 0x0000000100d54831 frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 1953
36 swift 0x0000000100d5294d main + 1677
37 libdyld.dylib 0x00007fff960e05fd start + 1
38 libdyld.dylib 0x0000000000000061 start + 1777465957
Stack dump:
0. Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c /Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Classes/NetClass/Downloader.swift -primary-file /Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Vistas/Proyecto/MapaViewController.swift /Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Vistas/Widget/ToggleView.swift /Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Classes/Entities/Mapa.swift /Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Classes/Entities/Edificio__c.swift .
.
.
.
.
1. While type-checking 'loadMapa' at /Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Vistas/Proyecto/MapaViewController.swift:56:5
2. While type-checking expression at [/Users/Fortis/Proyectos/IOS Apps/Abilia/Abilia iOS/Abilia/Abilia/Vistas/Proyecto/MapaViewController.swift:57:9 - line:57:29] RangeText="mapaView.delegate = s"
func loadMapa () {
mapaView.delegate = self
var theCoord = CLLocationCoordinate2DMake(0, 0)
if let coordenadasU = coordenadas {
let coordArray:[NSString] = coordenadasU.componentsSeparatedByString(",") as [NSString]
if coordArray.count > 1 {
let lat: CLLocationDegrees = coordArray[0].doubleValue;
let long: CLLocationDegrees = coordArray[1].doubleValue;
theCoord = CLLocationCoordinate2DMake(lat, long)
}
}
pointAnnotation.coordinate = theCoord;
mapaView.addAnnotation(pointAnnotation)
let span = MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)
let region:MKCoordinateRegion = MKCoordinateRegion(center: theCoord, span: span)
mapaView.setRegion(region, animated: true)
mapaLoaded = true;
}

Answer 1

This is one of Swift's many bugs where the compiler suddenly crashes because of specific code in your app it cannot handle.
You have to isolate the problematic part (e.g. by commenting out parts of the screen) and once it compiles again find a workaround to use different code.
How does your method loadMapa look like? It's the cause the compiler mentioned.

Answer 2

I had same error when subclassing UIButton and overriding selected property like this:
class ActionButton: UIButton {
override var selected: Bool = true {
didSet {
updateBackgroundColor()
}
}
}
Solution was to remove ' = true' from the override statement:
class ActionButton: UIButton {
override var selected: Bool {
didSet {
updateBackgroundColor()
}
}
}
I'm just guessing but I would double-check if you implemented your delegate method exactly right way... With all exclamation marks correctly given... '!' at the end of MKAnnotationView! seems to be a bit suspicious.

Answer 3

I've searched why The error: "Command failed due to signal: Segmentation fault: 11" is causing problems in my app... My app is Parse dependent. I found out that Parse made changes to method:
query.findObjectsInBackgroundWithBlock({ (objects : [AnyObject]?, error : NSError?) -> Void in
to
query.findObjectsInBackgroundWithBlock({ (objects : [**PFObject**]?, error : NSError?) -> Void in
I've changed it all, and now it works. Hope this will help someone using Parse. Cheers

Answer 4

Not really a specific answer, but I wanted to add another possible cause of this bug (since it's still quite common).
My program had code like so:
if (myArray.count > 0) && (.Foo != myArray.last) {
// Do something
}
In my case .Foo belonged to an enum for which I'd implemented Equatable, however, for some reason the Swift compiler didn't highlight my comparison to myArray.last as an error (non-optional compared to optional) and produced a segmentation fault.
In my case the fix was simply to use myArray.last! since the myArray.count > 0 ensures this will always succeed (must be at least one element).
As usual, once you know what the bug is, be sure to pass it on to bug report.apple.com!