Combining 'AND' and 'OR' Condition in NSPredicate

Question

Back again needing more help with constructing my NSPredicates :(

Category
{
   name:string
   subs<-->>SubCategory
}

SubCategory
{
   name:string
         


        

Answer 1

For Swift, this is how you can do it:

SWIFT 4.x - AND

        let p0 = NSPredicate(format: "X == 1")
        let p1 = NSPredicate(format: "Y == 2")
        fetchRequest.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [p0, p1])

SWIFT 4.x - OR

        let p0 = NSPredicate(format: "X == 1")
        let p1 = NSPredicate(format: "Y == 2")
        fetchRequest.predicate = NSCompoundPredicate(orPredicateWithSubpredicates: [p0, p1])

SWIFT 4.x - NOT

        let p0 = NSPredicate(format: "X == 1")
        let p1 = NSPredicate(format: "Y == 2")
        fetchRequest.predicate = NSCompoundPredicate(notPredicateWithSubpredicates: [p0, p1])

Example

This is an example from one of my codes, where I look for uid and sync:

        let p0 = NSPredicate(format: self.uid + " = '" + uid + "'")
        let p1 = NSPredicate(format: self.sync + " = %@", NSNumber(value: true as Bool))
        fetchRequest.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [p0, p1])