The declaration of indexesOfObjectsPassingTest: looks like this in Swift,
func indexesOfObjectsPassingTest(predicate: ((AnyObject!, Int, CMutablePointer<ObjCBool>) -> Bool)!) -> NSIndexSet!
I've tried all sorts of permutations to get this to work, but I'm stumped, particularly with how you deal with this piece, CMutablePointer<ObjCBool>) -> Bool)!
. I found it confusing enough, when I was first learning blocks in objective-c, how you translate from the declaration to actual use of a method, and the syntax of Swift is at least as confusing.
This code is working in the Playground for me ;) Hope it helps a bit
import Cocoa
let list = [2, 3, 4, 5, 6, 7, 8]
func test (object: AnyObject!, index: Int, stop: CMutablePointer<ObjCBool>) -> Bool
{
let number = object as Int
return (number % 2 == 0) //for even numbers
}
let result: NSIndexSet = (list as NSArray).indexesOfObjectsPassingTest(test)
println("\(result.lastIndex)") //prints "6" (because 8%2=0)
I transformed my above example to work with an inline-closure (described in the Swift-eBook). The parameter-list and return-type is separated by the term in
.
import Cocoa
let list = [2, 3, 4, 5, 6, 7, 8]
let result: NSIndexSet = (list as NSArray).indexesOfObjectsPassingTest({
(object: AnyObject!, index: Int, stop: CMutablePointer<ObjCBool>) -> Bool in
let number = object as Int
return (number % 2 == 0) //for even numbers
})
println("\(result.lastIndex)") //prints "6" (because 8%2=0)
Seems like CMutablePointer was recently changed to UnsafeMutablePointer.
This one worked for me:
let indices = myArray.indexesOfObjectsPassingTest({
(obj: AnyObject!, idx: Int, stop: UnsafeMutablePointer<ObjCBool>) -> Bool in
var didPass = false
//determine if obj passes test, if it does set didPass = true
return didPass
})
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