使用NSPredicate和array进行cloudKit搜索

Question

When using a NSPredicate , I'm trying to search all objects (strings) contained within an array. The code sample below works but the predicate only collects the object in the first index only?? The NSPredicate is used for a CKQueryOperation . Each Record has a value for a key named Category .

    let array: [String] = ["Education", "Sport", "TV and Film"]

    // select all records
    //let predicate = NSPredicate(format: "Category = %@", category )



    let predicate = NSPredicate (format: "Category == %@", argumentArray: array)

    let query = CKQuery(recordType: "quizRecord", predicate: predicate)

    // get just one value only
    let operation = CKQueryOperation(query: query)

  //code works but only queries Records with the Category for "Education" 

Answer 1

Try replacing:

"Category == %@"

With:

"Category IN %@"

Answer 2

I was having the same issue as Peter Wiley. The solution I found was a mash up of Danny Bravo's solution and comment on that solution.

let arrayPredicate = NSPredicate(format: "Name IN %@", argumentArray: [names])

To get multiple results I needed to use both the keyword "IN" in the format and wrap my argumentArray with [].