arrays - 无法设置数组内字典的值 [Swift]

Question

我试图在 swift 中设置数组内字典的值，但出现错误。
上面写着Cannot pass immutable value of type '[Dictionary]' to mutating binary operator '+='

我的代码如下:
// Declare the array
var numbersArray:[Dictionary] = [Dictionary<String, Any>]()

...更多代码...

func createArray() {
    for var iteration = 0; iteration < 75; iteration++ {
        //Add numbers to the array
        // May be used to set column
        var column:String
        switch iteration {
        case 0...14:
            column = "B"
            numbersArray += [["Randomized" : false, "Column" : "B", "Origin" : 0]]
        case 15...29:
            column = "I"
            numbersArray += [["Randomized" : false, "Column" : "I", "Origin" : 0]]
        case 30...44:
            column = "N"
            numbersArray += [["Randomized" : false, "Column" : "N", "Origin" : 0]]
        case 45...59:
            column = "G"
            numbersArray += [["Randomized" : false, "Column" : "G", "Origin" : 0]]
        case 60...74:
            column = "O"
            numbersArray += [["Randomized" : false, "Column" : "O", "Origin" : 0]]
        default:
            column = "Out Of Bounds"
            numbersArray += [["Randomized" : false, "Column" : "Out Of Bounds", "Origin" : 0]]
        }
        // numbersArray1 += [["Randomized" : false, "Column" : String(column), "Origin" : 0]]

    }
}

有什么想法吗？
注意:这在 Playground 上效果很好。

Answer 1

您不能对不兼容项目的数组(类型可以更改)使用 +=，您需要将值附加到数组，如下所示:

var numbersArray = [Dictionary<String, Any>]() 
numbersArray.append(["Randomized" : false, "Column" : "B", "Origin" : 0])

如果您有一个字符串或整数数组，则可以使用 +=

var numbersArray = [String]() 
NumbersArray += ["I am always a string"]

有关集合的更多详细信息，请访问 this apple documentation