ios - SwiftData 错误 NSFileManager

Question

我正在更新 SwiftData从 Swift 1.2 到 Swift 2，经过一些更改和更正后，我仍然遇到错误，我无法理解为什么会这样。

代码如下:

    public static func saveUIImage(image: UIImage) -> String? {

    let docsPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as String
    let imageDirPath = docsPath.stringByAppendingPathComponent("SwiftDataImages")

    if !NSFileManager.defaultManager().fileExistsAtPath(imageDirPath) {

        do {
            try NSFileManager.defaultManager().createDirectoryAtPath(imageDirPath, withIntermediateDirectories: false, attributes: [:])
        } catch {
            print("Error creating SwiftData image folder")
            return nil
        }

    }

    let imageID = NSUUID().UUIDString
    let imagePath = (imageDirPath as NSString).stringByAppendingPathComponent(imageID)
    let imageAsData = UIImagePNGRepresentation(image)
    if !imageAsData!.writeToFile(imagePath, atomically: true) {
        print("Error saving image")
        return nil
    }
    return imageID

}

Xcode 在“do {”行抛出以下错误:

Cannot invoke 'createDirectoryAtPath' with an argument list of type '(String, withIntermediateDirectories: Bool, attributes: _, error: _)'

关于为什么会发生这种情况的任何提示？这让我发疯。

谨致问候，并提前致谢。

;)

Answer 1

在我的 Xcode 7.2 中没有:

let imageDirPath = docsPath.stringByAppendingPathComponent("SwiftDataImages")

所以我尝试了这段代码，它编译得很好:

public func saveUIImage(image: UIImage) -> String? {

    let docsPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as String
    let imageDirPath = NSURL(string: docsPath)?.URLByAppendingPathComponent("SwiftDataImages")

    if !NSFileManager.defaultManager().fileExistsAtPath(imageDirPath!.absoluteString) {

        do {
            try NSFileManager.defaultManager().createDirectoryAtPath(imageDirPath!.absoluteString, withIntermediateDirectories: false, attributes: [:])
        } catch {
            print("Error creating SwiftData image folder")
            return nil
        }

    }

    let imageID = NSUUID().UUIDString
    let imagePath = (imageDirPath!.absoluteString as NSString).stringByAppendingPathComponent(imageID)
    let imageAsData = UIImagePNGRepresentation(image)
    if !imageAsData!.writeToFile(imagePath, atomically: true) {
        print("Error saving image")
        return nil
    }
    return imageID
}