CODEWITHSUNDEEP
iosswift
Richmond Watkins
Richmond Watkins

Reputation: 1370

Swift 2.2 enumerateObjectsUsingBlock - stop

Prior to Swift 2.2 I could stop an enumeration by making the stop parameter mutable with var and then setting it appropriatelystop = UnsafeMutablePointer<ObjCBool>.alloc(NSNumber(bool: true).integerValue)

Now in 2.2 making a parameter mutable is deprecated so how do I stop an enumeration?

Upvotes: 2

Views: 1721

Answers (2)

vadian
vadian

Reputation: 285072

Your syntax is pretty weird ;-)

This works in both Swift 2.1 and 2.2

let array: NSArray = [1, 2, 3, 4, 5]
array.enumerateObjectsUsingBlock { (object, idx, stop) in
  print(idx)
  if idx == 3 {
    stop.memory = true
  }
}

Swift 3:

let array: NSArray = [1, 2, 3, 4, 5]
array.enumerateObjects({ (object, idx, stop) in
    print(idx)
    if idx == 3 {
        stop.pointee = true
    }
})

Nevertheless – as suggested in the other answer – use native Swift Array.

Upvotes: 5

vikingosegundo
vikingosegundo

Reputation: 52227

You should uses the tools Swift offers instead:

for (idx, value) in array.enumerate(){
    print(idx)
    if idx == 10 { break }
}

As you clarified in your comment, that you are enumerating a PHFetchResult, use following extensions to enable swift enumeration:

extension PHFetchResult: SequenceType {
    public func generate() -> NSFastGenerator {
        return NSFastGenerator(self)
    }
}

let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]

let allPhotos = PHAsset.fetchAssetsWithOptions(fetchOptions)

for (idx, photoAsset) in allPhotos.enumerate() {
    if idx == 2 { break }
    print("\(idx) \(photoAsset)")
}

Results in:

0 <PHAsset: 0x7fa0d9f29c40> B84E8479-475C-4727-A4A4-B77AA9980897/L0/001 mediaType=1/0, sourceType=1, (4288x2848), creationDate=2009-10-09 21:09:20 +0000, location=0, hidden=0, favorite=0 
1 <PHAsset: 0x7fa0d9f29df0> 106E99A1-4F6A-45A2-B320-B0AD4A8E8473/L0/001 mediaType=1/0, sourceType=1, (4288x2848), creationDate=2011-03-13 00:17:25 +0000, location=1, hidden=0, favorite=0

Upvotes: 0

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