Type 'AnyObject' does not conform to protocol 'SequenceType'

Question

func loadThumbnails() {

    let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
           


        

Answer 1

Apple states in The Swift Programming Language:

The for-in loop performs a set of statements for each item in a range, sequence, collection, or progression.

Right now, directoryContent is just conforming to protocol AnyObject, so you can't use for loops over it. If you want to do so, you have to do something similar to the following:

for item in directoryContent as [AnyObject] {
    //Do stuff
}

Answer 2

contentsOfDirectoryAtPath returns an NSArray, whereas you are casting it to AnyObject. The solution is to cast it to either [AnyObject]? or NSArray:

let directoryContent: [AnyObject]? = fileManager.contentsOfDirectoryAtPath(documentsDirectory, error: &error)

or

let directoryContent: NSArray? = fileManager.contentsOfDirectoryAtPath(documentsDirectory, error: &error)

Then use an optional binding before the for loop:

if let directoryContent = directoryContent {
    for item:AnyObject in directoryContent {

Looking at the contentsOfDirectoryAtPath documentation, it states it always returns an array - so what said above can be reduced to unwrapping the return value to either a swift or objc array, with no need to use the optional binding:

let directoryContent: [AnyObject] = fileManager.contentsOfDirectoryAtPath(documentsDirectory, error: &error)!

or

let directoryContent: NSArray = fileManager.contentsOfDirectoryAtPath(documentsDirectory, error: &error)!