Question

我有这个数组：

var array = [[12,46,["a","b","c"],"nil",true,7,true],[10,40,["c","d","e"],"nil",true,7,true],[0,1,["z","l","w"],"hey",false,7,true]].

当我尝试通过以下代码更改数组boolean的最后一个布尔值：

array[0][6] = false

我收到此错误＆＃34;无法通过下标下标分配是get-only数组＆＃34;

Answer 1

有趣。我认为编译器在某个地方绊倒了。您只需检查数组的类型即可理解原因：

var array = [
    [12,46,["a","b","c"],"nil",true,7,true],
    [10,40,["c","d","e"],"nil",true,7,true],
    [0,1,["z","l","w"],"hey",false,7,true]
]

print(array.dynamicType) // Array<NSArray>
                         // can't assign to the inner array since NSArray is immutable

给Swift一个内部类型的提示，它可以正常工作

var array: [[AnyObject]] = [
    [12,46,["a","b","c"],"nil",true,7,true],
    [10,40,["c","d","e"],"nil",true,7,true],
    [0,1,["z","l","w"],"hey",false,7,true]
]

array[0][6] = false     // works

Answer 2

您应该使用元组数组。使代码更好，性能更好，不依赖于Objective-C：

var array = [
    (12,46,["a","b","c"],"nil",true,7,true),
    (10,40,["c","d","e"],"nil",true,7,true),
    (0,1,["z","l","w"],"hey",false,7,true)
]

// Array has type [(Int, Int, [String], String, Bool, Int, Bool)]

array[0].6 = false

swift：更改数组的内容会给我一个错误

2 个答案: