在Swift中解析CSV文件
应用启动时,我需要将数据预加载到tableView中。所以我通过解析.csv文件来使用核心数据。为此,我正在关注本教程。这是我的parseCSV函数
func parseCSV (contentsOfURL: NSURL, encoding: NSStringEncoding, error: NSErrorPointer) -> [(stationName:String, stationType:String, stationLineType: String, stationLatitude: String, stationLongitude: String)]? { // Load the CSV file and parse it
let delimiter = ","
var stations:[(stationName:String, stationType:String, stationLineType: String, stationLatitude: String, stationLongitude: String)]?
let content = String(contentsOfURL: contentsOfURL, encoding: encoding, error: error)
stations = []
let lines:[String] = content.componentsSeparatedByCharactersInSet(NSCharacterSet.newlineCharacterSet()) as [String]
for line in lines {
var values:[String] = []
if line != "" {
// For a line with double quotes
// we use NSScanner to perform the parsing
if line.rangeOfString("\"") != nil {
var textToScan:String = line
var value:NSString?
var textScanner:NSScanner = NSScanner(string: textToScan)
while textScanner.string != "" {
if (textScanner.string as NSString).substringToIndex(1) == "\"" {
textScanner.scanLocation += 1
textScanner.scanUpToString("\"", intoString: &value)
textScanner.scanLocation += 1
} else {
textScanner.scanUpToString(delimiter, intoString: &value)
}
// Store the value into the values array
values.append(value as! String)
// Retrieve the unscanned remainder of the string
if textScanner.scanLocation < textScanner.string.characters.count {
textToScan = (textScanner.string as NSString).substringFromIndex(textScanner.scanLocation + 1)
} else {
textToScan = ""
}
textScanner = NSScanner(string: textToScan)
}
// For a line without double quotes, we can simply separate the string
// by using the delimiter (e.g. comma)
} else {
values = line.componentsSeparatedByString(delimiter)
}
// Put the values into the tuple and add it to the items array
let station = (stationName: values[0], stationType: values[1], stationLineType: values[2], stationLatitude: values[3], stationLongitude: values[4])
stations?.append(station)
}
}
return stations
}
这是我的示例.csv文件
Rithala,Underground,Yellow Line,28.7209,77.1070
但我在这条线上出现错误
let station = (stationName: values[0], stationType: values[1], stationLineType: values[2], stationLatitude: values[3], stationLongitude: values[4]) stations?.append(station)
我究竟做错了什么 ?请帮我。
回答:
您正在尝试解析文件路径而不是文件内容。
如果您更换
let content = String(contentsOfURL: contentsOfURL, encoding: encoding, error: error)
与:
if let data = NSData(contentsOfURL: contentsOfURL) { if let content = NSString(data: data, encoding: NSUTF8StringEncoding) {
//existing code
}
}
那么代码将适用于您的示例文件。
以上是 在Swift中解析CSV文件 的全部内容, 来源链接: utcz.com/qa/421878.html