Swift: 'IN' query alternative using NSPredicate for fetching records from iCloud

问题

In iCloud, I want to search in Item's table, where I have userId column in swift but I didn't know how

Table: User

UserId {String type}
UserName {String type}

Table: Item

ItemId {String type}
ItemName {String type}
UserId {String type}

I need NSPredicate alternative to this query

Select * from item where userId in (2,3,4)

Also, is there any way so I can fire sql query directly in iCloud?

---

Is this is the correct way of doing above in Swift?

var orList = [NSPredicate]()
orList.append(NSPredicate(format: "userId = %i", 2))
orList.append(NSPredicate(format: "userId = %i", 3))       
orList.append(NSPredicate(format: "userId = %i", 4))

Or is there any way to pass array of [2, 3, 4]

Thanks-

回答1:

Try this;

let usrIds:[Int] = [1,2,3];
let predicate:NSPredicate = NSPredicate(format: "userId IN %@", usrIds);

ref. https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Predicates/Articles/pUsing.html

来源：https://stackoverflow.com/questions/33775144/swift-in-query-alternative-using-nspredicate-for-fetching-records-from-icloud