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SwiftUI Cookbook
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In the Using @State to drive a View's behavior recipe, you saw how to use an @State
variable to change a UI. But what if we want to have another view that changes that @State
variable?
Given that an array has a value-type semantic, if we pass down the variable, Swift creates a copy of the variable, and if the variable is mutated, changes are not reflected in the original.
SwiftUI solves this with the @Binding
property wrapper, which, in a certain way, creates a reference semantic for specific structs.
To explore this mechanism, we are going to create an extension of the TodoList
app that we created in the Using @State to drive a View's behavior recipe, where we are going to add a child view that allows us to add a new to-do to the list.
The starting point for this project is the final code of the previous recipe, so you can use the same StaticTodoList
project you used previously.
If you...