Cannot convert value of type '[Record]' to type 'Record' in coercion

Question

Im re-writing an iOS app I made using C# and Xamarin to Swift for obvious reasons of Xamarin\'s pricing, and low documentation. Following this tutorial for including a UIS

Answer 1

filteredArrayUsingPredicate is an NSArray method, so you should cast it to NSArray:

let array = (self.records as NSArray).filteredArrayUsingPredicate(searchPredicate)

But this still generate an error "[Record] is not convertible to NSArray". This is because an NSArray can only contain Objective-C objects, and Record is a Swift struct and is not convertible to an object. There are two solutions.

Solution 1:

Declare Record as an object

class Record: NSObject {
    let album : String
    let artist : String
    let genre : String
    let year : Int
    let speed : String
    let size : Int

    init(album : String, artist : String, genre : String, year : Int, speed : String, size : Int) {
        self.album = album
        self.artist = artist
        self.genre = genre
        self.year = year
        self.speed = speed
        self.size = size
    }
}

Then the following code should works

let searchPredicate = NSPredicate(format: "SELF.artist CONTAINS [c] %@", searchController.searchBar.text!)
let array = (self.records as NSArray).filteredArrayUsingPredicate(searchPredicate)
self.filteredRecords = array as! [Record]

Note your original predicate doesn't make sense, and would cause runtime error, because Record is not a String, so I replace it.

Solution 2:

Use the Swift way to filter:

let searchText = searchController.searchBar.text!.lowercaseString
filteredRecords = self.records.filter { (aRecord) -> Bool in
    return aRecord.artist.lowercaseString.containsString(searchText)
}