ios - 如果文件已经存在，如何增加文件名？

Question

如果文件已经存在，如何增加文件名？这是我正在使用的代码:

let count: Int = 1
var newFileName = ""

let path = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
let url = NSURL(fileURLWithPath: path)
let filePath = url.URLByAppendingPathComponent("MyDoc.pdf").path!
let fileManager = NSFileManager.defaultManager()
if fileManager.fileExistsAtPath(filePath) {
    print("FILE AVAILABLE")
    newFileName =  "MyDoc\(count).pdf"

} else {
    print("FILE NOT AVAILABLE")
}

MyDoc.pdf, MyDoc(1).pdf, MyDoc(5).pdf 那么如何递增呢？

Answer 1

Swift 4 解决方案:

func copyFile(fromPathString:String, toPathString:String) {

    let myManager = FileManager.default
    let fromPath : URL = URL(fileURLWithPath: fromPathString)
    var toPath = toPathString + fromPath.lastPathComponent
    let filename = (URL(fileURLWithPath: toPath)).lastPathComponent
    let fileExt  = (URL(fileURLWithPath: toPath)).pathExtension
    var fileNameWithoSuffix : String!
    var newFileName : String!
    var counter = 0


    if filename.hasSuffix(fileExt) {
        fileNameWithoSuffix = String(filename.prefix(filename.count - (fileExt.count+1)))
    }

    while myManager.fileExists(atPath: toPath) {
        counter += 1
        newFileName =  "\(fileNameWithoSuffix!)_\(counter).\(fileExt)"
        let newURL = URL(fileURLWithPath:toPathString).appendingPathComponent(newFileName).path
        toPath = newURL
    }

    try! myManager.copyItem(atPath: fromPathString, toPath: toPath)

}