Question

function App() {
    const [recipes, setRecipes] = useState(sampleRecipes)
    function handleAddRecipe() {
        const newRecipe = {
            id: uuidv4(),
            name: "Banana Shake",
            servings: 1,
            cooktime: "0.5",
            instructions: "1. Put suger into cut bananas\n2. Blend it",
            ingredients: [
                {
                    id: uuidv4(),
                    name: 'sugar',
                    amount: '2 tbs'
                }
            ]
        }
        console.log([...recipes, newRecipe])
        setRecipes([...recipes, newRecipe])
    }

    function handleDeleteRecipe(id) {
        const filteredRecipes = recipes.filter(recipe => recipe.id !== id);
        console.log(filteredRecipes)
        setRecipes(filteredRecipes)
    }

    return (
        <RecipeList recipes={sampleRecipes} 
            handleAddRecipe={handleAddRecipe} 
            handleDeleteRecipe={handleDeleteRecipe}
        />
    )
}

在这里，我想通过使用 useState 钩子更新状态将新配方添加到列表中。 state 的默认值是“sampleRecipes”，它是一个对象数组。我已经检查过配方的状态已更改，但 UI 未更新。使用数组作为状态有什么问题吗？

Answer 1

您正在向列表中传递常量 sampleRecipes 而不是状态 recipes。

状态更改后 UI 未更新

1 个答案: