从swift 2中的对象和键数组创建字典

Question

我有Keys数组和Objects数组,我想创建一个字典,键数组中索引Y处的每个键引用对象数组中相同索引Y处的对象,即我想在Swift 2中创建这样的代码:

NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithObjects:ObjectsArray forKeys:KeysArray];

Answer 1

let keys = [1,2,3,4]
let values = [10, 20, 30, 40]
assert(keys.count == values.count)

var dict:[Int:Int] = [:]
keys.enumerate().forEach { (i) -> () in
    dict[i.element] = values[i.index]
}
print(dict) // [2: 20, 3: 30, 1: 10, 4: 40]

或更多功能和通用方法

func foo<T:Hashable,U>(keys: Array<T>, values: Array<U>)->[T:U]? {
    guard keys.count == values.count else { return nil }
    var dict:[T:U] = [:]
    keys.enumerate().forEach { (i) -> () in
        dict[i.element] = values[i.index]
    }
    return dict
}

let d = foo(["a","b"],values:[1,2])    // ["b": 2, "a": 1]
let dn = foo(["a","b"],values:[1,2,3]) // nil