[英]Adding a new data on a new row in CSV file
我想使用https://github.com/yaslab/CSV.swift/issues將數組中的數據添加到CSV文件中,他們建議的方式是每行都需要聲明
try! csv.write(row: ["", ""])
例如,手動。
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()
無論如何,我需要使其自動創建新行,具體取決於數組內的對象數。 所以我通過將每個csv追加到數組中來更改了它
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!
}
但是每次我嘗試保存它時,都會導致致命錯誤:索引超出了循環for行的范圍 ,並且根本不保存
任何建議都會有幫助
Swift(和大多數語言)中的數組從零開始。 因此,您希望for循環從0到count-1。 有一個內置構造..<
,非常適合:
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])])
}
聽起來您需要索引從1到itemList.count
csv數組,以及從0到itemList.count - 1
所有其他數組的itemList.count - 1
。 因此,您可能應該使用
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])])
}
(請注意csv
的索引中的+1
)。
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