[swift-users] NSInvocation equivalent

[Bob Miller via swift-users]

Hello Swift Users,

        This is a Swift3 newbie question that I’ve not found a solution to. Has 
there been any consensus reached on an equivalent approach to the AppKit class 
NSInvocation ? Here’s a simple objC example.


-(NSInteger)totalCount
{
    NSInteger totalCount = -1;
    if ([self.representedObject respondsToSelector:@selector(totalCount)])
    {
       SEL selector = @selector(totalCount);
        NSMethodSignature  *aSignature = [[self.representedObject class] 
instanceMethodSignatureForSelector:selector];

        if (aSignature != nil)
        {
            NSInvocation  *anInvocation = [NSInvocation 
invocationWithMethodSignature:aSignature];
            [anInvocation setSelector:selector];
            [anInvocation setTarget:self.representedObject];
            [anInvocation invoke];
            [anInvocation getReturnValue:&totalCount];
        }
    }
    return totalCount;
}

Thanks and regards,
RFM
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