通过字符串迭代并测试字符的差异(Iterate through Strings and test for differences in characters)

通过字符串迭代并测试字符的差异(Iterate through Strings and test for differences in characters)

我正在尝试遍历一系列与此类似的字符

//Example.txt 0 X X X 0 0 X 0 X 0 0 0 X 0 0 0 X 0 X 0 0 X X X 0

我想能够分辨出X和0之间的区别。 我目前使用的代码导致无限循环运行，然后我的应用程序从未完成构建。

let path = Bundle.main.path(forResource: "Example.txt", ofType: nil) do { let fileContents = try String(contentsOfFile:path!, encoding: String.Encoding.utf8) let lines = fileContents.components(separatedBy: "\n") for row in 0..<lines.count { let items = lines[row].components(separatedBy: " ") for column in 0..<items.count { print(column,row) } } } catch { print("Error loading map") }

它会很好地对整个.txt文档进行迭代，它不会完成构建和运行，它会停留在白色的加载屏幕上。 我认为这与文本的编码有关

我如何修复无限循环错误，并告诉我打算在后面添加的不同字符之间的区别。

-编辑-

我想出了如何测试角色来说明他们之间的差异 -

for row in 0..<lines.count { let items = lines[row].components(separatedBy: " ") for column in 0..<items.count { if items[1] == "0" { print("0") } else { print("X") } } }

问题在于它将文档中的每一行视为一个数组，因此测试中的项目行出现数组越界错误。

I am trying to iterate through a series of characters similar to this

//Example.txt 0 X X X 0 0 X 0 X 0 0 0 X 0 0 0 X 0 X 0 0 X X X 0

I want to be able to tell the difference between the X's and the 0's. The code I am currently using cause an infinite loop to run and then my app never finishes building.

let path = Bundle.main.path(forResource: "Example.txt", ofType: nil) do { let fileContents = try String(contentsOfFile:path!, encoding: String.Encoding.utf8) let lines = fileContents.components(separatedBy: "\n") for row in 0..<lines.count { let items = lines[row].components(separatedBy: " ") for column in 0..<items.count { print(column,row) } } } catch { print("Error loading map") }

It will Iterate through the .txt document perfectly fine, it just won't finish building and running, it gets stuck on the white loading screen. I think it has something to do with the encoding of the text

How can I fix the infinite loop bug, and tell the difference between the different characters that I intend to add in later.

-Edit-

I figured out how to test the characters to tell the difference between them using-

for row in 0..<lines.count { let items = lines[row].components(separatedBy: " ") for column in 0..<items.count { if items[1] == "0" { print("0") } else { print("X") } } }

the problem is that it treats each row in the document as an array so the items line when testing reaches an array out-of-bounds error.

最满意答案

你没有在内部使用“列”变量。 事实上，在每一次迭代中，您总是将“items”数组的第二个元素（ items[1] ）与“0”进行比较 。 如果items数组少于2个元素，则会导致出界错误。

也许你应该迭代如下（我建议使用“for in”循环）：

for line in lines { let items = line.components(separatedBy: " ") for item in items { if item == "0" { print("0") } else { print("X") } } }

虽然我不明白你的“if else”，但如果文件只能包含“0”或“X”，而你只是将其可视化，那么你可以直接print(item) 。

You are not using the "column" variable inside your inner for. In fact, on every iteration, you're always comparing the second element of the "items" array (items[1]) against "0". If the items array has less than 2 elements, it will cause an out-of-bounds error.

Perhaps you should iterate as follows (I suggest using "for in" loops):

for line in lines { let items = line.components(separatedBy: " ") for item in items { if item == "0" { print("0") } else { print("X") } } }

Although I don't understand your "if else", if the file can only contain either "0" or "X" and you're only visualizing it, you might as well just print(item) instead.