在Xcode 8.2中编译大数组文字 [英] Compiling large array literal in Xcode 8.2

问题描述

使用Swift存储大型多维数组的最佳方法是什么？

What is the best way to store a large multidimensional array with Swift?

我有一个4D整数数组，现在它在Xcode 8.2中的编译速度似乎减慢了，因为它约有200组9个整数（共1800个）。第一个数组由12个数组组成，然后每个数组都有8个数组，然后每个数组都有2个或更多数组，每个数组由9个整数组成。问题是我计划将数据量增加5到6倍。

I have a 4D array of integers that seems to have slowed down compiling in Xcode 8.2 now that its about 200 sets of 9 integers (1800 total). The first array is made up of 12 arrays, which then each has 8 arrays, which then each has 2 or more arrays, which are each made up of 9 integers. The thing is I plan to probably increase the amount to data by 5 or 6 times.

昨晚我无法编译我的应用程序，今天早上它终于可以工作了，但是它还是很慢。我认为问题会随着加到数组上而变得更加严重。

I couldn't compile my app last night and it finally worked this morning but it was still slow. I figure the problem will just get worse as I add to the array.

有人说只是将每个数组附加到viewDidLoad中，有人说要为数组加载数组txt文件，但我不知道该怎么做。

Some people say to just append each array in the viewDidLoad and some have mentioned loading the array for a txt file but I don't know how to do that.

推荐答案

很抱歉，我一直在开这个玩笑，但是您需要以与超人进入裤子相同的方式进行此操作：一次一只腿。从整体结构开始。然后继续制作最里面的数组，并将它们附加到外面的数组中，以建立最外面的数组。这将帮助您入门：

I'm sorry to keep making the same joke, but you need to do this the same way Superman gets into his pants: one leg at a time. Start with the overall structure. Then keep making the innermost arrays and appending them into the outer arrays to build up the outermost array. This will get you started:

var level1 : [[[[Int]]]] = []
var level2 : [[[Int]]] = []
var level3 : [[Int]] = []
// -----
level3 = []
let innermost1 = [1,2,3,4,5,6,7,8,9]
let innermost2 = [11,12,13,14,15,16,17,18,19]
level3.append(innermost1)
level3.append(innermost2)
level2.append(level3)
level1.append(level2)
// ... keep going ...

通过这种方式，我们不需要任何大/深数组字面量，并且项目可以编译

In this way, we never need any big / deep array literals, and the project will compile easily.

也请注意，每个级别的数组类型都是明确声明的。这样一来，Swift便比推论起来要快乐得多。

Note too that the type of the array at each level is explicitly declared. This makes Swift a lot happier than having to infer it.

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