The usage of containsobject in Nsarray

Method scenarios that use Cotainsobject are common, such as determining whether an element (object) exists in an array

But when you use it, you need to be aware that the Constainsobject is an address comparison when comparing objects equally.

If two different addresses and the objects with exactly equal content take the Containsobject default comparison returns the result is no

In this case, we generally need to overload the NSObject-(BOOL) IsEqual: (ID) object method in a custom class

-(BOOL) IsEqual: (ID) Object {

if (self = = object) {

return YES;

}

if (![ Object Iskindofclass:[tekuaentity CALSS]]) {

return NO;

}

Tekuaentity *tekubaentity = (tekubaentity *) object;

if (tekubaentity.id_ = = self.id_) {

return YES;

} else {

return NO;

}

}