致命错误：索引超出范围tableview
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任何人都可以看到我错在哪里？ tableView控制器应显示1或4个部分（取决于前一个View Controller的输入）以及来自阵列的动态行数。
该程序应该用不同的数组填充每个部分，但是我在Switch语句的第三种情况下收到索引超出范围错误。截面和行在viewdidLoad()方法中设置，selectPic()方法相应地更改houseImg变量。
我正在使用Swift 4。
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
if checkData == 0 {
//Inserting one section and filling the cells with the array
saveCount = pupilNames.count
if saveCount > counter{
cell.imageView?.image = houseImg
cell.textLabel?.text = "Pupil Name: (pupilNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (pupilScores[indexPath.row])"
counter = counter+1
}
checkData = 2
return cell
}
else if checkData == 1 {
//Inserting four sections and populate 4 arrays for each section
var countIf: Int = 0
var secondCount: Int = 0
houseCount = 4
if checkCount > houseCont {
switch houseCont {
case 0:
chosenHouse = 1
selectPic()
countIf = pupilNames.count
repeat {
cell.imageView?.image = houseImg
cell.textLabel?.text = "Pupil Name: (pupilNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (pupilScores[indexPath.row])"
secondCount = secondCount+1
} while countIf > secondCount
case 1:
chosenHouse = 2
selectPic()
countIf = secondNames.count
secondCount = 0
repeat {
cell.imageView?.image = houseImg
cell.textLabel?.text = "Pupil Name: (secondNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (secondScores[indexPath.row])"
secondCount = secondCount+1
} while countIf > secondCount
case 2:
chosenHouse = 3
selectPic()
countIf = thirdNames.count
secondCount = 0
repeat {
cell.imageView?.image = houseImg
//*******Error occurring on Pupil Name line *********
cell.textLabel?.text = "Pupil Name: (thirdNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (thirdScores[indexPath.row])"
secondCount = secondCount+1
} while countIf > secondCount
case 3:
chosenHouse = 4
selectPic()
repeat {
cell.imageView?.image = houseImg
cell.textLabel?.text = "Pupil Name: (fourNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (fourScores[indexPath.row])"
secondCount = secondCount+1
}while countIf > secondCount
default:
houseCont = 5
checkData = 2
}
houseCont = houseCont+1
}
}
return cell
}
编辑：'houseCount'从前一个视图控制器发送，包含一个或四个值。 'saveCount'包含通过将所有数组的计数相加而创建的数字，这是在填充数组的方法中完成的。
saveCount = pupilNames.count+secondNames.count+thirdNames.count+fourNames.count
override func numberOfSections(in tableView: UITableView) -> Int{
return houseCount
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return saveCount
}
最终编辑：感谢所有人的帮助，这是两个答案的混合，帮助我解决了我的错误。这是我修复我的问题的最终代码，我删除了if语句和重复循环以及更改了一些代码以解决我的问题。
else if checkData == 1 {
houseCount = 4
switch indexPath.section {
case 0:
chosenHouse = 1
selectPic()
cell.imageView?.image = houseImg
cell.textLabel?.text = "Pupil Name: (pupilNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (pupilScores[indexPath.row])"
case 1:
chosenHouse = 2
selectPic()
cell.imageView?.image = houseImg
cell.textLabel?.text = "Pupil Name: (secondNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (secondScores[indexPath.row])"
case 2:
chosenHouse = 3
selectPic()
cell.imageView?.image = houseImg
cell.textLabel?.text = "Pupil Name: (thirdNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (thirdScores[indexPath.row])"
case 3:
chosenHouse = 4
selectPic()
//saveCount = fourNames.count
cell.imageView?.image = houseImg
cell.textLabel?.text = "Pupil Name: (fourNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (fourScores[indexPath.row])"
default:
houseCont = 5
checkData = 2
}
houseCont = houseCont+1
}
看看下面的代码，有几个警钟响起：
chosenHouse = 3
selectPic()
countIf = thirdNames.count
secondCount = 0
repeat {
cell.imageView?.image = houseImg
//*******Error occurring on Pupil Name line *********
cell.textLabel?.text = "Pupil Name: (thirdNames[indexPath.row])"
cell.detailTextLabel?.text = "Score: (thirdScores[indexPath.row])"
secondCount = secondCount+1
} while countIf > secondCount
首先使用repeat。里面的代码总是至少执行一次。我认为在thirdNames.count == 0的情况下这将是一个错误
然而，更奇怪的是，重复循环的内容在迭代之间不会改变。你不做任何取决于唯一改变的事情 - secondCount。如果countIf为10，则只需将相同的名称和分数分配给相同的两个控件10次。
我不确定但是在最后一个switch语句中根据我的说法，当它执行时，插入到部分时会出现问题，因为它可能会以某种方式超出索引路径行计数。编写代码的方式也没有考虑indexPath.section。
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