ios - 类型 '[String]' 的值没有成员 'lastObject'

Question

我有错误 (shoppingList.lastObject)

    var shoppingList = ["bananas", "milk", "vanilla ice cream"]
    var itemCount = shoppingList.count
    print("There are \(itemCount) items.")
    for item in shoppingList
    {
        print("I need to buy \(item).")
    }
    print("The most important item on my list is definitely \(shoppingList.lastObject)")

它说 lastObject 不是成员。

Answer 1

它是last 而不是lastObject:

var shoppingList = ["bananas", "milk", "vanilla ice cream"]
var itemCount = shoppingList.count
print("There are \(itemCount) items.")
for item in shoppingList {
    print("I need to buy \(item).")
}
print("The most important item on my list is definitely \(shoppingList.last)")

注意:使用.first获取第一个元素。