★ ファイルへの書き込み
let fileName = "data.txt"
let text = "abcde"
if let dir: NSString = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first {
let filePath = dir.stringByAppendingPathComponent(fileName)
do {
try text.writeToFile(filePath, atomically: false, encoding: NSUTF8StringEncoding)
} catch {
//エラー処理
}
}
★ ファイルの読み込み
let fileName = "data.txt"
if let dir: NSString = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first {
let filePath = dir.stringByAppendingPathComponent(fileName)
do {
let text = try NSString(contentsOfFile: filePath, encoding: NSUTF8StringEncoding)
print(text)
} catch {
//エラー処理
}
}
★ ファイルに対して文字列を追加する(.txtの場合)
if let dir: NSString = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first {
let filePath = dir.stringByAppendingPathComponent(fileName)
let output = NSOutputStream(toFileAtPath: filePath, append: true)
output?.open()
let text = "test" // 末尾に追加する文字列
let cstring = text.cStringUsingEncoding(NSUTF8StringEncoding)
let bytes = UnsafePointer<UInt8>(cstring!)
let size = text.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)
output?.write(bytes, maxLength: size)
output?.close()
}