我想使用 https://github.com/yaslab/CSV.swift/issues 将数组中的数据添加到 CSV 文件中顺便说一句,他们建议的方式是每个新行都需要声明
try! csv.write(row: ["", ""])
例如,手动。
import Foundation
import CSV
let stream = OutputStream(toFileAtPath: "/path/to/file.csv", append: false)!
let csv = try! CSVWriter(stream: stream)
try! csv.write(row: ["id", "name"])
try! csv.write(row: ["1", "foo"])
try! csv.write(row: ["1", "bar"])
csv.stream.close()
无论如何,我需要让它根据数组内对象的数量自动创建一个新行。所以我通过将每个 csv 附加到数组中来更改它
func saveCSVFiles() -> URL {
let itemList = objectNo
let fileManager = FileManager.default
let documentDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
csvFile = documentDirectory.appendingPathComponent("\(fileName!).csv")
let path = csvFile
let stream = OutputStream(url: csvFile!, append: false)
let csv = try! [CSVWriter(stream: stream!)]
try! csv[0].write(row: ["name", "x", "y", "width", "height"])
for no in stride(from: 1, to: itemList.count, by: 1) {
try! csv[no].write(row: [String(describing: objects.dataName[no]), String(describing: objects.dataX[no]), String(describing: objects.dataY[no]), String(describing: objects.boundingX[no]), String(describing: objects.boundingY[no])])
}
csv[itemList.count].stream.close()
print("yesss!", "\(fileName!)")
return path!
}
但每次我尝试保存它都会导致 fatal error :索引超出范围在线for循环上并且根本不保存
任何建议都会有帮助
最佳答案
Swift(以及大多数语言)中的数组是从零开始的。所以你希望 for 循环从 0 到 count-1。有一个内置构造, ..<
,这非常适合:
for no in 0..< itemList.count {
try! csv[no].write(row: [String(describing: objects.dataName[no]), String(describing: objects.dataX[no]), String(describing: objects.dataY[no]), String(describing: objects.boundingX[no]), String(describing: objects.boundingY[no])])
}
编辑
听起来您需要将 csv 数组索引为从 1 到 itemList.count
,以及从 0 到 itemList.count - 1
的所有其他数组。因此你可能应该使用
for no in 0..< itemList.count {
try! csv[no+1].write(row: [String(describing: objects.dataName[no]), String(describing: objects.dataX[no]), String(describing: objects.dataY[no]), String(describing: objects.boundingX[no]), String(describing: objects.boundingY[no])])
}
(注意 +1
索引中的 csv
。)
关于ios - 在 CSV 文件的新行中添加新数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47140598/