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Objective-c determine if parameter is an object

in Objective-c I have this function prototype: - (NSString *) formatSQL: (NSString *) sql, ... I can pass any type of parameters to this function: NSString, NSNumber, integer, float How to define in a function if the parameter is it an object (NSString ..) or primitive (integer ...)? thanks to BrochPirate

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1 answer


If you have a parameter that accepts multiple types, you can only safely do so using Obj-C objects, which means using id

as a type. You cannot safely mix id

with float

, integer

etc.

If you are all wrapped float

and int

in NSNumber

s, you could be this way:



- (NSString *)formatSQL:(id)obj
{
    if ([obj isKindOfClass:[NSString class]]) {
        // Format as a string
    }
    else if ([obj isKindOfClass:[NSNumber class]]) {
        // Further processing will be required to differentiate between ints and floats
    }
}

There are a few caveats to use isKindOfClass:

, but this should serve as a good starting point.

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