objective c - Is there a native function that checks if a value is inside of an enum? -

i'm trying put uilabels inside of nsdictionary, i'm using tags key, problem is, not of labels inside of view needed, tags of uilabels needed inside of enum.

so want is, check tag if exist inside of enum add dictionary tag key.

for (nsobject *obj in [self.formview subviews]) {      if ([obj iskindofclass:[uilabel class]]) {         uilabel *label = (uilabel *)obj;          // here want add check before line         labeldict[[nsstring stringwithformat:@"%d",label.tag]] = label;     } } 

for future readers:

if iterating on nsarray type of object code above, should use nsarray function enumerateobjectsusingblock instead, this answer, doesn't more pretty:

[self.formview.subviews enumerateobjectsusingblock:^(id obj, nsuinteger idx, bool *stop) {         if ([obj iskindofclass:[uilabel class]]) {             uilabel *label = (uilabel *)obj;             if ( label.tag >= textfieldtype_min_val && label.tag <= textfieldtype_max_val ) {                 labeldict[[nsstring stringwithformat:@"%d",label.tag]] = label;             }         } }];  

objective-c enums inherited c enums , cannot reflected @ runtime. without abusing debug symbols (which overly complicated task slow , unreliable result), believe impossible come function tell if arbitrary value member of arbitrary enum.

one possible workaround create nsset contains enum values have, , check if label's tag exists within set. otherwise, if enum sequential, can check tag between enum's minimum value , maximum value.