[swift-users] Customizing my custom type's appearance in the debugger

[Enrico Granata]

Tim,
the Xcode variables view is controlled by a different mechanism than the playgrounds/po - there is a reference for that mechanism at http://lldb.llvm.org/varformats.html <http://lldb.llvm.org/varformats.html>
The gist of it is that you're going to want to make a synthetic child provider that returns no child elements for your object - that will be what the variables view picks up

> On Jun 26, 2016, at 9:41 PM, Dmitri Gribenko <gribozavr at gmail.com> wrote:
> 
> On Sun, Jun 26, 2016 at 5:03 PM, Tim Vermeulen <tvermeulen at me.com> wrote:
>> I already did that, sorry for not providing any code. Take this as an
>> example:
>> 
>> public struct Wrapper<Element> {
>> 
>>    private var elements: [Element]
>> 
>>    public init<S: Sequence where S.Iterator.Element == Element>(_ sequence:
>> S) {
>>        elements = [Element](sequence)
>>    }
>> 
>> }
>> 
>> extension Wrapper: Collection {
>> 
>>    public var startIndex: Int { return elements.startIndex }
>>    public var endIndex: Int { return elements.endIndex }
>> 
>>    public func index(after index: Int) -> Int {
>>        return index + 1
>>    }
>> 
>>    public subscript(position: Int) -> Element {
>>        return elements[position]
>>    }
>> 
>> }
>> 
>> extension Wrapper: CustomReflectable {
>> 
>>    public var customMirror: Mirror {
>>        return Mirror(self, unlabeledChildren: self, displayStyle:
>> .collection)
>>    }
>> 
>> }
>> 
>> If I debug an instance of this Wrapper type, then Xcode’s Variables View
>> will show
>> 
>> ▿ wrapper
>>  ▿ elements = x values
>>    [0] = 0
>>    [1] = …
> 
> I see.  I'm not sure there's a way to hide anything from Xcode's variables view.
> 
> +Enrico.
> 
> Dmitri
> 
> -- 
> main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
> (j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/


Thanks,
- Enrico
📩 egranata@.com ☎️ 27683

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