错误：类型'String'的值没有成员'URLByAppendingPathComponent'

Question

我的错误是： 类型'String'的值没有成员'URLByAppendingPathComponent'

我在这一行中遇到错误：

 let savePath = documentDirectory.URLByAppendingPathComponent("mergeVideo-\(date).mov")

我的完整代码：

  // 4 - Get path
  let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] 
  var dateFormatter = NSDateFormatter()
  dateFormatter.dateStyle = .LongStyle
  dateFormatter.timeStyle = .ShortStyle
  let date = dateFormatter.stringFromDate(NSDate())
  let savePath = documentDirectory.URLByAppendingPathComponent("mergeVideo-\(date).mov")

    let url = NSURL(fileURLWithPath: savePath)

我遵循了本教程：Here

Answer 1

它的

let savePath = (documentDirectory as NSString).stringByAppendingPathComponent("mergeVideo-\(date).mov")

因为documentDirectory是String而不是NSURL

修改

我建议使用此API：

let documentDirectory = try! NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: false)
var dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = .LongStyle
dateFormatter.timeStyle = .ShortStyle
let date = dateFormatter.stringFromDate(NSDate())
let saveURL = documentDirectory.URLByAppendingPathComponent("mergeVideo-\(date).mov") // now it's NSURL

Swift 3 +

let documentDirectory = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
var dateFormatter = DateFormatter()
dateFormatter.dateStyle = .long
dateFormatter.timeStyle = .short
let date = dateFormatter.string(from: Date())
let saveURL = documentDirectory.appendingPathComponent("mergeVideo-\(date).mov")

Answer 2

如错误所述，URLByAppendingPathComponent类没有String方法可用，该函数属于NSURL。

您需要使用：

let savePath = (documentDirectory as NSString).stringByAppendingPathComponent("mergeVideo-\(date).mov")

或者你可以这样做：

let url      = NSURL(fileURLWithPath: documentDirectory)
let savePath = url.URLByAppendingPathComponent("mergeVideo-\(date).mov")

Answer 3

Swift 3：URL appendingPathComponent

    let documentDirectory = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
        let completeMovie = documentDirectory.appendingPathComponent("movie.mov") // now it's NSURL

Swift 3 Path

  let fm = FileManager.default

        let docsurl = try! fm.url(for:.documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
        let completeMovie = String(describing: docsurl.appendingPathComponent("merge.mp4"))