相关疑难解决方法(0)

我的Xcode项目中有一个XML文件,我想先把它保存到磁盘上,其次我怎么知道我是否成功保存了它？这是正确的方法吗？使用模拟器我导航到iOS 11中的新"文件"文件夹,我看不到它,但我不确定它是否应该存在？

guard let path = Bundle.main.url(forResource: "sample", withExtension: "xml") else {print("NO URL"); return}
    let sample = try? Data(contentsOf: path)


print("sample XML = \(String(describing: sample?.debugDescription))")

//put xml file on the device
let filename = getDocumentsDirectory().appendingPathComponent("sample.xml")
do {
    try sample?.write(to: filename)
} catch {
    print("ERROR")
}

更新以包括我检查文件是否存在:

 //check if file exists
    let checkPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    let url = URL(fileURLWithPath: checkPath)
let filePath = url.appendingPathComponent("sample.xml").path
let fileManager = FileManager.default
if fileManager.fileExists(atPath: filePath) {
    print("FILE AVAILABLE")
} else { …