Missing parameter name in completion block causes an error

[robinsalehjan]

Hi!

The method: performInNewBackgroundContext: is missing a parameter name in the completion block.

//The method is declared like this in the current bridging header:
[self.dataStack performInNewBackgroundContext:^(NSManagedObjectContext * _Nonnull) {
        <#code#>
    }];

//It should be declared like this:
[self.dataStack performInNewBackgroundContext:^(NSManagedObjectContext * _Nonnull backgroundContext) {
        <#code#>
    }];

[3lvis]

How would you fix that?

[robinsalehjan]

The problem is that the parameter name in the block, declared in the method performInNewBackgroundContext: is missing.

Im not very familiar with Swift or generating bridging headers.
**I am assuming that Xcode is translating the function declaration in Swift to Objective-C methods, available in the header.

In the class DATAStack.swift the function is declared as:

public func performInNewBackgroundContext(operation: (backgroundContext: NSManagedObjectContext) -> ()) {
   <#code#>
}

Could changing the function declaration to

public func performInNewBackgroundContext(operation: (backgroundContext: NSManagedObjectContext) -> Void) {
   <#code#>
}

Then generating new bridging headers solve the issue?

[3lvis]

I sincerely think that this isn't something that we can fix, but I might be wrong.

Changing -> () for -> Void changes nothing because they are equivalent.

[robinsalehjan]

Yes, I agree.
What about mentioning the issue in the "Background Thread NSManagedObjectContext" under the "Objective-C" section?

[3lvis]

That's a good idea!

[robinsalehjan]

Great, I will close this issue and make a pull request.