Find all occurances of a character in a string using Swift

Swift find characters

let search_str = "l"

let string = "Hello World"
let needle:Character = search_str[search_str.startIndex]
let upper:String = String(needle).uppercaseString

var char_locations:[String] = ["-", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"]


for (index, character) in enumerate(Array(string)) {

  if (character == needle) {

    char_locations.insert(upper, atIndex:index)

  }

}

println("\(upper) was found at location \(char_locations) in '\(string)'")