ios - How to check if an id points to a CGRect? -

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supposing have:

id value = [self valueforkey:@"frame"]; bool valueiscgrect = ???;

how can decide? should cast id something?

the returned value of type nsvalue scalar types, provides method objctype, returns encoded type of wrapped scalar type. can use @encode() encoding arbitrary type, , compare objctype.

if(strcmp([value objctype], @encode(cgrect)) == 0) {    // it's cgrect }

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