如何在 Swift 5 中循环字典？

Question

在 Swift 4 中，我可以使用下面的代码，但在 Swift 5 中，我收到以下错误：Type 'Dictionary<String, String>.Values.Iterator' does not conform to protocol 'Sequence'

guard let userIds = users.values.makeIterator() else { return }

for userId in userIds {
    // User setup
}

现在 Swift 5 中正确的方法是什么？

Answer 1

你可以简单地做

for (_, userId) in users {
    // User setup
}

Answer 2

let dictionary: [String: Int] = ["a": 1, "b": 2]

for (key, value) in dictionary {
    print(key, value)
}

Answer 3

您可以像这样尝试迭代器：

 let users = ["a":11, "b":12]
 var userIds = users.values.makeIterator()
 while let next = userIds.next() {
    print(next) // 11 \n 12
 }

Answer 4

Swift4、swift5及以上

let dict: [String: Any] = ["a": 1, "b": "hello", "c": 3]

        for (key, value) in dict {
            print(key, value)
        }

Answer 5

另外：

let x = [
"kitty": 7,
"bob": 2,
"orange": 44
]
x.forEach { t in
    print("key = \(t.key); value = \(t.value)")
}

How to loop over a dictionary in Swift 5?