实际上，我认为问题在于返回变量名而不是值。您可以通过Swift字典来实现。示例代码如下：

Actually I think the issue is for return the variable name instead of the value. You can achieve it by Swift dictionary. Sample code is like:

let users1 = [
"amya": 1,
"amyb": 2,
"amyc": 10
]
let max = users1.values.maxElement()

func allKeysForValue<K, V : Equatable>(dict: [K : V], val: V) -> [K] {
    return dict.filter{ $0.1 == val }.map{ $0.0 }
}

let keys = allKeysForValue(users1, val: max!)
print(keys)

结果是： [amyc]

它将找到结果最大值来自哪个变量，并将变量名称作为键返回。

It will find which variable the result largest value came from and return the variable names as keys.