Loop through AnyObject Array

Question

My data contains user data of various values (which I can parse out) then balances for each user in a number of currencies.

I can parse out the user data. For example:

if let add2 = parsed["address"] as? String {
    println("Alert: \(add2)")
}

I can get the lists of balances:

if let findbalances = parsed["balances"]{    
           println("find the balances: \(findbalances)")

and I can get the individual values:

var balance11:Double = findbalances[0]["available_amount"] as! Double/100

var curr11:String = findbalances[0]["currency"] as! String

The array is AnyObject. If I try:

for currency in findbalances {

I get

Type AnyObject does not conform to Sequence

So then I tried to downcast it to String:

if let findbalances = parsed["balances"] as? String {
for currency in findbalances {

and my output is blank.

Yet I know the values are there.

I am stumped; how do you loop through an AnyObject Array in Swift?

Travis M. · Accepted Answer · 2015-04-24 22:10:26Z

3

I think you're close. In your code "for currency in findbalances {", you should know that currency is a dictionary, not the currency. Were you looking for something like this?

for balance in findbalances as! [[String: AnyObject]] {
    let currency = balance["currency"] as! String
    //do something with currency
}

edited Apr 24, 2015 at 22:10

answered Apr 24, 2015 at 21:56

Travis M.

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7 Comments

Aaron Brager Over a year ago

as should be as! or as?

Travis M. Over a year ago

I think that's only the case if findbalances is an optional right? If it's a ! already, the "as" should work? I'm assuming it's not an optional since he's pulling data directly like he was... I guess in that case, he wouldn't need the "as [[String: AnyObject]]" at all.

Eendje Over a year ago

since Swift 1.2, as has to be either as! or as?.

Travis M. Over a year ago

Ok, fixed it. @techguy, note if the compiler complains you may be able to remove the "as" portion from the findbalances if it was originally defined properly.

Airspeed Velocity Over a year ago

@Jaconbson not quite – casts that aren’t guaranteed at compile time to succeed (such as AnyObject to something else) have to be as[?!]. But some casts are guaranteed at compile time to work every time (such as the other way – something else to AnyObject) and they can still be as

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