I have an app where users can rate films they have watched, and I want to be able to put these in a tableView. The rating is stored in Firestore, and I want to put both the KEY and value into a Struct so I can access it for the tableView.
However any site/tutorial/stack question I have seen only gets the Maps value, but not the key (in this case, the title name). I can access the value, but only by using the field key, but that is what I am trying to get (see attempt 1)
Struct:
struct Rating: Codable {
var ratedTitle: String
var ratedRating: Int
}
Variable:
var ratedList = [Rating]()
Load data function (attempt 1):
let dbRef = db.collection("Users").document(userID)
dbRef.getDocument { document, error in
if let error = error {
print("There was an error \(error.localizedDescription)")
} else {
if let docData = document!.data() {
let titleRating = docData["Title Ratings"] as? [String: Int]
let midnightMass = titleRating!["Midnight Mass"]
print("Rating given to Midnight Mass: \(midnightMass!) stars")
}
}
}
//Prints: Rating given to Midnight Mass: 2 stars
Also tried (but I don't know how to get this array onto a tableView and have the first index as the Title label, and the second index a Rating label for each movie in the array) attempt 2:
if let docData = document!.data() {
let titleRating = docData["Title Ratings"] as? [String: Int]
self.userRatedList = titleRating!
print("userRatedList: \(self.userRatedList)")
}
//Prints: userRatedList: ["Midnight Mass": 2, "Bly Manor": 5]
Attempt 3:
if let docData = document!.data() {
let titleRating = docData["Title Ratings"] as? [String: Int]
self.ratedList = [Rating(ratedTitle: <#T##String#>, ratedRating: <#T##Int#>)]
//Don't know what I would put as the ratedTitle String or ratedRating Int.
self.ratedList = [Rating(ratedTitle: titleRating!.keys, ratedRating: titleRating!.values)]
//Cannot convert value of type 'Dictionary<String, Int>.Keys' to expected argument type 'String'
//Cannot convert value of type 'Dictionary<String, Int>.Values' to expected argument type 'Int'
}
Firstly, I am not sure why you need the struct to conform to Codable?
Now, based off what I see, "Title Ratings" is a dictionary with a String key and an Int value. You are overcomplicating this. If you want to access the key and value of each element individually, use a for-in loop.
//Declare your global variable
var ratedList = [Rating]()
//If you are using an if let, there is not need to force unwrap
if let docData = document.data() {
if let userRatingList = docData["Title Ratings"] as? [String: Int] {
for (key, value) in userRatingList {
let rating = Rating(ratedTitle: key, ratedRating: value)
ratedList.append(rating)
}
//reload your tableView on the main thread
DispatchQueue.main.async {
tableView.reloadData()
}
}
}
I have created enum with associated value and I want to be able to dynamically update associated value. As far as I know Swift doesn't support that at the moment.
Because of that I used following approach:
enum PersonInfo {
class EnumValue<T> {
var value: T
init(_ value: T) {
self.value = value
}
}
// Instead of using String or Bool or any other type directly, use EnumValue wrapper
case firstName(EnumValue<String>)
case lastName(EnumValue<String>)
case isAdult(EnumValue<Bool>)
}
I want to add function that would update EnumValue.value property in following way:
func updateAssociatedValue<V>(_ updateValue: V) {
let mirror = Mirror(reflecting: self)
for associatedValue in mirror.children {
guard let value = associatedValue.value as? EnumValue<V> else {
continue
}
value.value = updateValue
}
}
Problem is that this guard statement always fails (guard let value = associatedValue.value as? EnumValue<V>) and I can't figure it out why.
On the other hand, when I write updateAssociatedValue with typed type then things work properly:
// This works
func updateAssociatedValue(_ updateValue: String) {
let mirror = Mirror(reflecting: self)
for associatedValue in mirror.children {
guard let value = associatedValue.value as? EnumValue<String> else {
continue
}
value.value = updateValue
}
}
Things compile normally but during the runtime guard statement always fails. Am I using generic value in some incorrect way? Should I use somehow updateValue.Type or updateValue.self (I tried but it didn't work).
Example of usage:
var array: [PersonInfo] = [
.firstName(PersonInfo.EnumValue("John")),
.lastName(PersonInfo.EnumValue("Doe")),
.isAdult(PersonInfo.EnumValue(false))
]
print(array)
// John, Doe, false
array.first?.updateAssociatedValue("Mike")
print(array)
// Mike, Doe, false
I can always reassign enum value in array but if possible I want to avoid that. That's the reason for asking this question.
I have this enum
public enum Format {
case label(key: String)
case textField(key: String)
case image(key: String)
}
And I can use it like:
Format.label(key: "abc")
Format.textField(key: "0.0")
Format.image(key: "mystringfile")
When I try to get the value, I can do it with this:
let control = Format.label(key: "abc")
if case let Format.label(key) = control {
tmp = key
} else if case let Format.image(key) = control {
tmp = key
} else if case let Format.textField(key) = control {
tmp = key
}
With that I can get the value, but I'm not finding the case label, textfield or image.
How I can find the enum that belongs that variable?
If I try to use something like this:
control == Format.label
I get the error:
Binary operator '==' cannot be applied to operands of type
'Table.Format' and '(String) -> Format'
I may misunderstand your question but why not use a switch?
let control = Format.label(key: "abc") // or = Format.textField(key: "whatever") or = Format.image(key: "whatever")
let tmp: String
switch control {
case .label(let key):
// It's a label, do what you need
tmp = key
case .textField(let key):
// It's a textField, do what you need
tmp = key
case .image(let key):
// It's a image, do what you need
tmp = key
}
This lets you act on the type and get the value.
According to Swift documentation:
Optional binding can be used with if and while statements to check for a value inside an optional, and to extract that value into a constant or variable, as part of a single action.
The documentation only shows an example of optional-binding using if statement like:
if let constantName = someOptional {
statements
}
I'm looking for an example of optional-binding using while loop?
It's the same
while let someValue = someOptional
{
doSomethingThatmightAffectSomeOptional(with: someValue)
}
Here is a concrete example of iterating a linked list.
class ListNode
{
var value: String
var next: ListNode?
init(_ value: String, _ tail: ListNode?)
{
self.value = value
self.next = tail
}
}
let list = ListNode("foo", ListNode("bar", nil))
var currentNode: ListNode? = list
while let thisNode = currentNode
{
print(thisNode.value)
currentNode = thisNode.next
}
// prints foo and then bar and then stops
I think the advantage of using while let ... is infinite loop that check some variable for any changes. But it's weird. For this kind of work you should use didSet. Or other good example is List data structure. Anyway, here is the example:
var value: Int? = 2
while let value = value {
print(value) // 2
break
}
Consider:
enum Line {
case Horizontal(CGFloat)
case Vertical(CGFloat)
}
let leftEdge = Line.Horizontal(0.0)
let leftMaskRightEdge = Line.Horizontal(0.05)
How can I access, say, lefEdge's associated value, directly, without using a switch statement?
let noIdeaHowTo = leftEdge.associatedValue + 0.5
This doesn't even compile!
I had a look at these SO questions but none of the answers seem to address this issue.
The noIdeaHowTo non compiling line above should really be that one-liner, but because the associated value can be any type, I fail to even see how user code could write even a "generic" get or associatedValue method in le enum itself.
I ended up with this, but it is gross, and needs me to revisit the code each time I add/modify a case ...
enum Line {
case Horizontal(CGFloat)
case Vertical(CGFloat)
var associatedValue: CGFloat {
get {
switch self {
case .Horizontal(let value): return value
case .Vertical(let value): return value
}
}
}
}
Any pointer anyone?
As others have pointed out, this is now kind of possible in Swift 2:
import CoreGraphics
enum Line {
case Horizontal(CGFloat)
case Vertical(CGFloat)
}
let min = Line.Horizontal(0.0)
let mid = Line.Horizontal(0.5)
let max = Line.Horizontal(1.0)
func doToLine(line: Line) -> CGFloat? {
if case .Horizontal(let value) = line {
return value
}
return .None
}
doToLine(min) // prints 0
doToLine(mid) // prints 0.5
doToLine(max) // prints 1
You can use a guard statement to access the associated value, like this.
enum Line {
case Horizontal(Float)
case Vertical(Float)
}
let leftEdge = Line.Horizontal(0.0)
let leftMaskRightEdge = Line.Horizontal(0.05)
guard case .Horizontal(let leftEdgeValue) = leftEdge else { fatalError() }
print(leftEdgeValue)
I think you may be trying to use enum for something it was not intended for. The way to access the associated values is indeed through switch as you've done, the idea being that the switch always handles each possible member case of the enum.
Different members of the enum can have different associated values (e.g., you could have Diagonal(CGFloat, CGFloat) and Text(String) in your enum Line), so you must always confirm which case you're dealing with before you can access the associated value. For instance, consider:
enum Line {
case Horizontal(CGFloat)
case Vertical(CGFloat)
case Diagonal(CGFloat, CGFloat)
case Text(String)
}
var myLine = someFunctionReturningEnumLine()
let value = myLine.associatedValue // <- type?
How could you presume to get the associated value from myLine when you might be dealing with CGFloat, String, or two CGFloats? This is why you need the switch to first discover which case you have.
In your particular case it sounds like you might be better off with a class or struct for Line, which might then store the CGFloat and also have an enum property for Vertical and Horizontal. Or you could model Vertical and Horizontal as separate classes, with Line being a protocol (for example).
Why this is not possible is already answered, so this is only an advice. Why don't you implement it like this. I mean enums and structs are both value types.
enum Orientation {
case Horizontal
case Vertical
}
struct Line {
let orientation : Orientation
let value : CGFloat
init(_ orientation: Orientation, _ value: CGFloat) {
self.orientation = orientation
self.value = value
}
}
let x = Line(.Horizontal, 20.0)
// if you want that syntax 'Line.Horizontal(0.0)' you could fake it like this
struct Line {
let orientation : Orientation
let value : CGFloat
private init(_ orientation: Orientation, _ value: CGFloat) {
self.orientation = orientation
self.value = value
}
static func Horizontal(value: CGFloat) -> Line { return Line(.Horizontal, value) }
static func Vertical(value: CGFloat) -> Line { return Line(.Vertical, value) }
}
let y = Line.Horizontal(20.0)
You can get the associated value without using a switch using the if case let syntax:
enum Messages {
case ping
case say(message: String)
}
let val = Messages.say(message: "Hello")
if case let .say(msg) = val {
print(msg)
}
The block inside the if case let will run if the enum value is .say, and will have the associated value in scope as the variable name you use in the if statement.
With Swift 2 it's possible to get the associated value (read only) using reflection.
To make that easier just add the code below to your project and extend your enum with the EVAssociated protocol.
public protocol EVAssociated {
}
public extension EVAssociated {
public var associated: (label:String, value: Any?) {
get {
let mirror = Mirror(reflecting: self)
if let associated = mirror.children.first {
return (associated.label!, associated.value)
}
print("WARNING: Enum option of \(self) does not have an associated value")
return ("\(self)", nil)
}
}
}
Then you can access the .asociated value with code like this:
class EVReflectionTests: XCTestCase {
func testEnumAssociatedValues() {
let parameters:[EVAssociated] = [usersParameters.number(19),
usersParameters.authors_only(false)]
let y = WordPressRequestConvertible.MeLikes("XX", Dictionary(associated: parameters))
// Now just extract the label and associated values from this enum
let label = y.associated.label
let (token, param) = y.associated.value as! (String, [String:Any]?)
XCTAssertEqual("MeLikes", label, "The label of the enum should be MeLikes")
XCTAssertEqual("XX", token, "The token associated value of the enum should be XX")
XCTAssertEqual(19, param?["number"] as? Int, "The number param associated value of the enum should be 19")
XCTAssertEqual(false, param?["authors_only"] as? Bool, "The authors_only param associated value of the enum should be false")
print("\(label) = {token = \(token), params = \(param)")
}
}
// See http://github.com/evermeer/EVWordPressAPI for a full functional usage of associated values
enum WordPressRequestConvertible: EVAssociated {
case Users(String, Dictionary<String, Any>?)
case Suggest(String, Dictionary<String, Any>?)
case Me(String, Dictionary<String, Any>?)
case MeLikes(String, Dictionary<String, Any>?)
case Shortcodes(String, Dictionary<String, Any>?)
}
public enum usersParameters: EVAssociated {
case context(String)
case http_envelope(Bool)
case pretty(Bool)
case meta(String)
case fields(String)
case callback(String)
case number(Int)
case offset(Int)
case order(String)
case order_by(String)
case authors_only(Bool)
case type(String)
}
The code above is from my project https://github.com/evermeer/EVReflection
https://github.com/evermeer/EVReflection