Question

我有一个简单的数组，想遍历它，并用false替换所有元素，但是for循环有问题。下面是我所做的一个示例。我是Swift的新手，因此真诚地感谢您对循环外观的任何帮助。

order by len([Forecast Week]) desc, [Forecast Week] desc;

Answer 1

您正在尝试：

for _ in sampleMembers() { _ = false }

_表示您希望忽略该值。您不想忽略该值，需要它。

for member in sampleMembers() { member.active = false }

但这有两个问题。 member是只读的，此行完成后，数组就消失了。

因此，您需要迭代数组的每个索引并更新每个值：

var members = sampleMembers()
for i in members.indices {
    members[i].active = false
}

Answer 2

示例：

struct ClubMembers {
    var name: String
    var active: Bool
}

func sampleMembers() -> [ClubMembers] {
    let member1 = ClubMembers(name: "David", active: true)
    let member2 = ClubMembers(name: "John", active: true)
    let member3 = ClubMembers(name: "Mitchell", active: true)

    return [member1, member2, member3]
}

var array = sampleMembers()

for i in 0..<array.count {
    array[i].active = false
}

for i in 0..<array.count {
    print(array[i].active)
}

用for循环替换数组元素

2 个答案: