在swift中創建對象和鍵數組字典

Question

我有Keys數組和對象數組，並且我想創建一個字典，其中鍵數組中的索引Y處的每個鍵都指向對象數組中相同索引Y處的對象，即I想要讓這樣的代碼，但是在斯威夫特2：

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] 

或更多的功能和通用的方法

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 

Answer 2

這是一個通用的解決方案

func dictionaryFromKeys<K : Hashable, V>(keys:[K], andValues values:[V]) -> Dictionary<K, V> 
{ 
    assert((keys.count == values.count), "number of elements odd") 
    var result = Dictionary<K, V>() 
    for i in 0..<keys.count { 
    result[keys[i]] = values[i] 
    } 
    return result 
} 

let keys = ["alpha", "beta", "gamma", "delta"] 
let values = [1, 2, 3, 4] 

let dict = dictionaryFromKeys(keys, andValues:values) 
print(dict) 

Answer 3

試試這個：

let dict = NSDictionary(objects: <Object_Array>, forKeys: <Key_Array>) 

    //Example 
    let dict = NSDictionary(objects: ["one","two"], forKeys: ["1","2"]) 

Answer 4

let keyArray = [1,2,3,4] 
let objectArray = [10, 20, 30, 40] 
let dictionary = NSMutableDictionary(objects: objectArray, forKeys: keyArray) 
print(dictionary) 

輸出： -

{ 
    4 = 40; 
    3 = 30; 
    1 = 10; 
    2 = 20; 
}