Re: Swift Compiler Bug?
Re: Swift Compiler Bug?
- Subject: Re: Swift Compiler Bug?
- From: Roland King <email@hidden>
- Date: Mon, 15 Sep 2014 11:00:07 +0800
> On 15 Sep 2014, at 10:47 am, Charles Jenkins <email@hidden> wrote:
>
> Now on to the next thing that doesn’t seem to work according to the documentation…
>
> These are the first few lines of my function which will save my document data:
>
> override func fileWrapperOfType(
> typeName: String!,
> error outError: NSErrorPointer
> ) -> NSFileWrapper!
> {
> if self.theFileWrapper == nil {
> let noWrappers: [AnyObject] = []
> self.theFileWrapper = NSFileWrapper( directoryWithFileWrappers: noWrappers )
>
> }
>
>
> When I start typing “directoryWithFileWrappers,” Xcode displays its suggestion list showing the prototype:
>
> NSFileWrapper( directoryWithFileWrappers: [NSObject : AnyObject] )
>
> I think I could send nil instead of bothering to create an empty array, but whatever.
>
> Anyway, Xcode gives me the prototype which agrees with Apple’s documentation, and I code according to it. Then Xcode marks the line as an error: “Missing argument for parameter ‘options’ in call,” and my project won’t build.
>
> Is there an error in my code, or is this a problem I should report to Apple? And in the latter case, what’s the best way?
>
There’s an error in your code, that’s not an array, it’s a dictionary. [ NSObject : AnyObject ] so your noWrappers is of the wrong type, you don’t even need to make it a variable either if you don’t want
NSFileWrapper( directoryWithFileWrappers: [:] )
note the colon
or
let noWrappers:[NSObject:AnyObject]=[:]
NSFileWrapper( directoryWithFileWrappers:[:] )
or
let noWrappers = [NSObject:AnyObject]()
NSFileWrapper( directoryWithFileWrappers:[:] )
or a number of other versions depending on how verbose you wish to be.
Please feel free to file a bug report about the terrible error messages the swift compiler tosses out which are entirely unhelpful and often lead in entirely the wrong direction. These days I treat almost any error message from the swift compiler as if it says ‘Syntax Error’ and don’t try to use the message to find the issue.
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