Questions tagged [swift-optionals]
56 questions
0
votes
1 answer
Force unwrap after guard let
I was told my code contains a lot of force unwrapping. I thought it's okay to do that if I am sure that the value operated won't be nil:
private var x: Int?
private var y: Int?
@IBAction func startButtonPressed(_ sender: UIButton) {
guard…
Anatolii Rudenko
- 368
- 3
- 9
0
votes
2 answers
Swift Extension - Optional
I'm trying to extend optionals into something readable, and achieved this so far:
@discardableResult
func isNotNil(_ handler: (Wrapped) -> Void) -> Optional {
switch self {
case .some(let value):
handler(value)
…
bhagat
- 38
- 4
0
votes
2 answers
CompactMapValues not working on this simple dictionary
I have a model that looks like:
public struct Profile {
public let bio: String?
public let company: String
public let createdDate: Date
public let department: String
public let email: String
public let firstName: String
public let…
Harry Blue
- 4,202
- 10
- 39
- 78
0
votes
2 answers
Cannot assign value of type 'String??' to type 'String?' error
let say I defined a class
class Dummy {
var title: String?
}
and I have a dictionary as
let foo: [Int: String?] = [:]
then when I make an assignment as below
var dummy = Dummy()
dummy.title = foo[1]
it says
Cannot assign value of type…
plymr
- 45
- 7
0
votes
1 answer
Optional Still Returning Nil After Assigning Value
I am working on a similar feature to 'liking/unliking a post'.
I have an MVVM architecture as;
struct MyStructModel {
var isLiked: Bool? = false
}
class MyStructView {
var isLiked: Bool
init(myStructModel: MyStructModel) {
…
David Henry
- 1,972
- 20
- 43
0
votes
1 answer
Unwrapping issue with AXUIElementCopyAttributeValue in Mac OS
I'm trying to copy some information regarding an accessibility window option. Unfortunately, I can't resolve an error that's caused by the AXUIElementCopyAttributeValue method, despite passing in what appears to be all the correct types as…
camelCaseCowboy
- 946
- 1
- 10
- 26
0
votes
1 answer
Duplicating a game scene for a secondary level?
I’m currently working on a sprite kit - I have a first level complete. My game scene calls from encounterManager for the scenes I have prepared.
I am curious as if it is possible to duplicate the game scene in order to set-up a secondary level? I…
AJ James
- 11
- 5
0
votes
2 answers
Swif struct not conform to Codable
I'm trying to let a struct with optionals being codable/decodable but I receive an error message:
Type 'item' does not conform to protocol 'Encodable'
here is the code:
struct Item: Codable {
let domanda: String
let rispostaSemplice:…
Manuel Zompetta
- 394
- 4
- 17
0
votes
2 answers
Loop through plist in swift
Hey guys I'm currently trying to loop through a plist that is set up like this:
The code I'm using:
letterPoints = NSDictionary(contentsOfFile: Bundle.main.path(forResource: "LetterPoints", ofType: "plist")!)
for (myKey, myValue) in…
Slacky88
- 67
- 4
0
votes
0 answers
Getting fatal error when AVAudioPlayer sound triggered by timer function in swift
Trying to trigger a sound file with timer function, but after timer count reaching to trigger the audio file, I get this error:
Fatal error: Unexpectedly found nil while unwrapping an Optional value.
I can't find the problem related to the…
Bezi
- 57
- 1
- 7
0
votes
1 answer
Swift optionals in class methods
I am still relatively new to swift, so I am having some problems with the proper syntax. Here is my code for the class Date, which has the isLeapYear and daysInMonth methods. I am having problems with the optionals for these methods:
class Date {
…
EvilTaco
- 133
- 2
- 8
0
votes
1 answer
How do you create an optional variable that is assigned a function in Swift
I would like to create an optional variable that can be assigned a function ( or can be nil). I'm guessing it would look something like this but the following code does not compile.
var variableThatWillBeAssignedAFunction: {(Int) -> Int}?
Thanks…
code kid
- 374
- 1
- 6
- 22
0
votes
1 answer
Kotlin Multiplatform keep optionals iOS framework
I'm currently building an API library with Kotlin Multiplatform, which I want to share between Android & iOS projects.
API responses, in some cases, contain optionals (which is a great feature of both Kotlin & Swift). For example:
data class…
Daan
- 475
- 5
- 17
0
votes
2 answers
Problem: My non optional variable is nil. (Fatal Error while unwrapping)
I am trying to update an UILabel.
@IBOutlet weak var balanceLabel: UILabel!
it is initially declared as a non optional variable:
var balanceValue: Int = 1
The UILabel depends on the not optional variable balanceValue.
func updateBalanceLabel()…
Roman P.
- 13
- 6
0
votes
1 answer
Swift ignoring parameter types defined in block signature
I have the code below, which the compiler is happy with:
func CheckPaintExists(colorCode : String, applicationCode : String) {
let checkRequest = NSFetchRequest(entityName: "Paint")
checkRequest.predicate =…
pnizzle
- 6,243
- 4
- 52
- 81