当迭代多维数组时，for循环为什么会中断？
当迭代多维数组时，for循环为什么会中断？
提问于 2016-11-06 00:41:18
我要做的是创建一个由数组组成的可编辑日历。
首先，我创建了一些变量：
import UIKit
/////////////////////////////////////////////////////////////////////
// Variables
var userName = "String"
var bedTime: Int = 0
var wakeTime: Int = 7
var sleepMonth = "String"
var quantifiedMonth: Int = 1然后是通过多维数组的日历：
var day0: [Int] = [0]
var day1: [Int] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]
var day2: [Int] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]
var day3: [Int] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]
var day4: [Int] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24]
var month0 = [[0]]
var january = [day0, day1, day2, day3, day4]
var february = [day0, day1, day2, day3, day4]
var march = [day0, day1, day2, day3, day4]
var april = [day0, day1, day2, day3, day4]
var may = [day0, day1, day2, day3, day4]
var june = [day0, day1, day2, day3, day4]
var july = [day0, day1, day2, day3, day4]
var august = [day0, day1, day2, day3, day4]
var september = [day0, day1, day2, day3, day4]
var october = [day0, day1, day2, day3, day4]
var november = [day0, day1, day2, day3, day4]
var december = [day0, day1, day2, day3, day4]
var calendar = [month0, january, february, march, april, may, june, july, august, september, october, december]然后，我尝试使用嵌套的for-循环来允许用户在他们通常睡着的时候说：
@IBAction func setVariablesButton(_ sender: UIButton)
{
bedTime = Int(bedTimeTextField.text!)!
wakeTime = Int(wakeTimeTextField.text!)!
quantifiedMonth = Int(monthToEditTextField.text!)!
var hourX = bedTime
var hourZ = wakeTime
var dayX = 1
let dayZ = 1
let lengthMonth = calendar[quantifiedMonth].count
for _ in 1...lengthMonth // Do the following for as many days
// as are in the month
{
for _ in calendar[1][dayX][hourX]...calendar[1][dayX][24]
{
calendar[1][dayX][hourX] = 0 // Loops by amount
hourX = hourX + 1 // specified 2 lines above
}
for _ in calendar[1][dayZ][0]...calendar[1][dayZ][hourZ]
{
calendar[1][dayX][hourZ] = 0
hourZ = hourZ - 1
}
dayX = dayX + 1 // Loops by amount specified 8 lines above
}
bedTimeLabel.text = "\(calendar[1][1])"
}当我在建筑时，我总是
var quantifiedMonth设置为0，这允许程序工作。然后我意识到如果我把它设为1，它就坏了。我不知道为什么，因为我得到的输出，当程序工作。
说我有
var quantifiedMonth = 0
bedTime = 20
wakeTime = 7那么我的输出就是
[0, 0, 0, 0, 0, 0, 0, 0, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 0, 0, 0, 0, 0] 但是什么时候
var quantifiedMonth = 1程序崩溃了。我想不出这是为什么。在我看来，我不应该得到我做的输出
var quantifiedMonth = 0请帮帮忙。我试着彻底地回答我的问题，但如果我对某件事含糊不清，请告诉我。
回答 1
Stack Overflow用户
回答已采纳
发布于 2016-11-07 19:36:29
问题是，您在for-循环之外声明变量，应该在其内部声明变量。
var hourX = bedTime
var hourZ = wakeTime应声明如下：
for _ in 1...lengthMonth
{
var hourX = bedTime
var hourZ = wakeTime否则，这些变量将不会像它们应该设置的那样被设置。
您还需要将lengthMonth更改为
let lengthMonth = calendar[quantifiedMonth].count - 1因为从1开始开始for循环，当数组从0开始时。否则，您将得到一个“索引超出范围”错误。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40444843
复制相关文章
相似问题
腾讯云开发者
