CODEWITHSUNDEEP
objective-cnspredicate
Sivaprasad Km
Sivaprasad Km

Reputation: 730

NSPredicate with Multiple Condition - Execute second condition based on first condition

I need to fetch data from Core data, for that , I need to check Condition1 and Condition 2 using NSPredicate. But I only need to check the condition 2 once condition 1 satisfied . Any one please help me to achieve this scenario ?

Logic 

If (Condition1 == true)
{
     if(Condition2 == True)
        {
         }
    else
       {
      //Code
       }
}
else
{
//codes
}

Please help me to achieve this scenario using NSPredicate.

Upvotes: 0

Views: 169

Answers (1)

Ken Thomases
Ken Thomases

Reputation: 90531

Just use an AND expression in your predicate format string. NSPredicate treats those as short-circuiting operators. That's implicit in this advice from the Predicate Programming Guide: Using Predicates – Performance Considerations section:

You should structure compound predicates to minimize the amount of work done. Regular expression matching in particular is an expensive operation. In a compound predicate, you should therefore perform simple tests before a regular expression […]:

In the […] example, the regular expression [after an OR] is evaluated only if the first clause is false.

(Emphasis added)

Upvotes: 1

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