property-observer Questions
3
Solved
I added a variable of Timer to my class, and used its didSet observer to invalidate old value
var timer: Timer? {
didSet { oldValue?.invalidate() }
}
deinit {
timer = nil
}
I thought this wou...
Clyte asked 15/10, 2018 at 16:1
4
Solved
I'm testing this and it appears that if you change the value within didSet, you do not get another call to didSet.
var x: Int = 0 {
didSet {
if x == 9 { x = 10 }
}
}
Can I rely on this? Is i...
Loseff asked 2/10, 2016 at 16:24
3
I have a very basic view that only shows a TextField:
View
struct ContentView: View {
@StateObject var viewModel = ViewModel()
var body: some View {
TextField("Enter a string...", t...
Brusa asked 16/1, 2022 at 21:34
5
Solved
Let's started with the code snippet:
St Foo {
var proA: Int = 0 { // needs initialization
willSet {
print("about to set proA to \(newValue) from \(proA)")
}
didSet {
print("already set proA ...
Inefficacy asked 11/10, 2016 at 20:26
5
Solved
What is the difference between willSet - didSet, and get - set, when working with this inside a property?
From my point of view, both of them can set a value for a property. When, and why, should ...
Spiro asked 20/8, 2014 at 7:10
11
Solved
Swift has a property declaration syntax very similar to C#'s:
var foo: Int {
get { return getFoo() }
set { setFoo(newValue) }
}
However, it also has willSet and didSet actions. These are calle...
Gospodin asked 3/6, 2014 at 2:32
1
Solved
It's well-known that, of course, didSet will not run on the same object again from inside a didSet. (example.)
However. It seems that: the restriction applies not only to that object, but to maybe...
Cognate asked 9/2, 2017 at 18:56
1
I want to observe whether a variable's value has been changed. I was wondering if Java has something that is equivalent to the willSet and didSet methods in Swift?
Hagfish asked 23/2, 2016 at 23:42
1
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