Answer by orkoden for What is the purpose of willSet and didSet in Swift?
One thing where didSet is really handy is when you use outlets to add additional configuration.@IBOutlet weak var loginOrSignupButton: UIButton! { didSet { let title =...
View ArticleAnswer by dfrib for What is the purpose of willSet and didSet in Swift?
The many well-written existing answers cover the question well, but I'll mention, in some detail, an addition that I believe is worth covering.The willSet and didSet property observers can be used to...
View ArticleAnswer by knshn for What is the purpose of willSet and didSet in Swift?
You can also use the didSet to set the variable to a different value. This does not cause the observer to be called again as stated in Properties guide. For example, it is useful when you want to limit...
View ArticleAnswer by Bartłomiej Semańczyk for What is the purpose of willSet and didSet...
NOTEwillSet and didSet observers are not called when a property is set in an initializer before delegation takes place
View ArticleAnswer by ragnarius for What is the purpose of willSet and didSet in Swift?
In your own (base) class, willSet and didSet are quite reduntant , as you could instead define a calculated property (i.e get- and set- methods) that access a _propertyVariable and does the desired...
View ArticleAnswer by Zigii Wong for What is the purpose of willSet and didSet in Swift?
The willSet and didSet observers for the properties whenever the property is assigned a new value. This is true even if the new value is the same as the current value.And note that willSet needs a...
View ArticleAnswer by user3675131 for What is the purpose of willSet and didSet in Swift?
My understanding is that set and get are for computed properties (no backing from stored properties)if you are coming from an Objective-C bare in mind that the naming conventions have changed. In Swift...
View ArticleAnswer by Analog File for What is the purpose of willSet and didSet in Swift?
I do not know C#, but with a little guesswork I think I understand what foo : int { get { return getFoo(); } set { setFoo(newValue); }}does. It looks very similar to what you have in Swift, but it's...
View ArticleAnswer by eonil for What is the purpose of willSet and didSet in Swift?
Getter and setter are sometimes too heavy to implement just to observe proper value changes. Usually this needs extra temporary variable handling and extra checks, and you will want to avoid even those...
View ArticleAnswer by Sebastien Martin for What is the purpose of willSet and didSet in...
These are called Property Observers:Property observers observe and respond to changes in a property’s value. Property observers are called every time a property’s value is set, even if the new value is...
View ArticleAnswer by zneak for What is the purpose of willSet and didSet in Swift?
The point seems to be that sometimes, you need a property that has automatic storage and some behavior, for instance to notify other objects that the property just changed. When all you have is...
View ArticleWhat is the purpose of willSet and didSet in Swift?
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 called before and...
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