how to fill <array> struct by another struct - arrays

Question

My app in Xcode with swift language programming :
I have a struct like:
struct PageFilter {
var key: Int?
var title: NSString?
}
And then I have the values in:
filters are coming from API and i am saving them to extractedFilter
if let filters = filters {
for filter in filters {
var extractedFilter = PageFilter()
extractedFilter.key = filter["key"].integerValue
extractedFilter.title = filter["title"].stringValue
}
}
I have an array of page filter like :
lazy var availableFilters = Array<PageFilter>()
I want to fill the availableFilters with ExtractedFilter.
******* *i fixed the issue by a loop like this code :
var strFilter : String = ""
for var i = 0; i < self.newFilterList.availableGuildFilters.count; i++ {
let guildFilter = self.newFilterList.availableGuildFilters[i]
if guildFilter.selected {
strFilter += "\(guildFilter.key),"
}
}
thanks to all*

Answer 1

The following Swift 1.2 playground code would do it - I have put in a function to simulate the call to the API
//: Playground - noun: a place where people can play
import Cocoa
struct PageFilter {
var key: Int?
var title: NSString?
}
// this would be replaced by whatever way you get your filters from the API
func getFiltersFromApi() -> [PageFilter]? {
// return nil // uncomment this line to demo the API returning nothing
return [PageFilter(key: 1, title: "one"),
PageFilter(key: 2, title: "two"),
PageFilter(key: 3, title: "three"),
PageFilter(key: nil, title: nil)
]
}
let filters: [PageFilter]? = getFiltersFromApi() // API call, this could return nil
let extractedFilters: [PageFilter]
if let filters = filters {
extractedFilters = filters.map { filter in
PageFilter(key: filter.key, title: filter.title)
}
} else {
extractedFilters = []
}
for filter in extractedFilters {
println("key: \(filter.key), title: \(filter.title)")
}
Alternatively you could have your lazy var like this
var availableFilters: [PageFilter] = {
let filters: [PageFilter]? = getFiltersFromApi() // API call, this could return nil
if let filters = filters {
return filters.map { filter in
PageFilter(key: filter.key, title: filter.title)
}
} else {
return []
}
}()
The code is similar to Leonardo's answer, the main difference being the use of the map function instead of for ... in ...

Answer 2

Try like this:
struct PageFilter {
var key = Int()
var title = String()
}
var filters:[PageFilter]? = []
filters = [PageFilter(key: 1, title: "one"), PageFilter(key: 2, title: "two"), PageFilter(key: 3, title: "three")]
var extractedFilter = Array<PageFilter>()
if let filters = filters {
for filter in filters {
extractedFilter.append(PageFilter(key: filter.key, title: filter.title))
}
}
println(extractedFilter[1].key) // "2"
println(extractedFilter[1].title) // "two"

Answer 3

I fixed the issue by a loop like this:
var strFilter : String = ""
for var i = 0; i < self.newFilterList.availableGuildFilters.count; i++ {
let guildFilter = self.newFilterList.availableGuildFilters[i]
if guildFilter.selected {
strFilter += "\(guildFilter.key),"
}
}