Filtering array of custom objects with NSPredicate via binding

Question

class MyClass {
    var result: Bool

    init(result: Bool) {
        self.result = result
     } 
}

I have an array([MyClass]) in my ArrayController connected via binding and I need to filter this array by property result.

For example half of these objects have result as false, I only want to display these items which have result == true, but it must be done with NSPredicate and I don't have any clue how to make this predicate, any ideas?

To make it clear, I'm required to use filterPredicate variable of NSArrayController to filter this array.

Gaurav Tiwari · Accepted Answer · 2017-06-12 13:44:27Z

1

First of all, your class MyClassmust conform to NSObject, this turns the declaration into,

class MyClass: NSObject {
var result: Bool
init(result: Bool) {
    self.result = result
 } 
}

then you can apply the NSPredicate as,

let bPredicate: NSPredicate = NSPredicate(format: "result contains[cd]       %@", true)
let searchArray = yourArray.filtered(using: bPredicate) as NSArray

answered Jun 12, 2017 at 13:44

Gaurav Tiwari

444 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Rajmund Zawiślak Over a year ago

As I mention earlier I'm required to use filterPredicate of an NSArrayController, not creating new array.

Irshad Ahmad · Accepted Answer · 2017-06-12 15:35:05Z

1

User Filter instead of NSPredicate

'let filteredArray = yourArray.filter({$0.result == true})'

answered Jun 12, 2017 at 15:35

Irshad Ahmad

1,39311 silver badges17 bronze badges

Comments

Rajmund Zawiślak · Accepted Answer · 2017-09-08 07:27:34Z

0

Ok, I solved problem by myself. Here is the code

arrayController.filterPredicate = NSPredicate { object, _ in
    (object as? MyClass)?.result
}

for dynamic var

dynamic var predicate: NSPredicate? = {
    return NSPredicate { object, _ in
        (object as? MyClass)?.result
    }
}()

edited Sep 8, 2017 at 7:27

answered Jun 12, 2017 at 13:57

Rajmund Zawiślak

96210 silver badges24 bronze badges

3 Comments

Willeke Over a year ago

How is this using the binding?

Rajmund Zawiślak Over a year ago

Ahh, right, just forgot to paste code for dynamic var.

Willeke Over a year ago

What did you bind to what? If you bind the filter predicate of the array controller, you don't have to set it.

Collectives™ on Stack Overflow

Filtering array of custom objects with NSPredicate via binding

3 Answers 3

1 Comment

Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related