更新到Swift 2.0后出错

Question

我最近更新了XCode。从那时起我就错了。

这里是我的代码：

 public func asUIImage() -> UIImage? { 
     if let path = value as? String{ 
      let docsPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] 
      let imageDirPath = docsPath.stringByAppendingPathComponent("SwiftDataImages") 
      let fullPath = stringByAppendingPathComponent(path) 
      if !NSFileManager.defaultManager().fileExistsAtPath(fullPath) { 
       print("SwiftData Error -> Invalid image ID provided") 
       return nil 
      } 
      let imageAsData = NSData(contentsOfFile: fullPath) 
      if let imageAsData = imageAsData { 
       return UIImage(data: imageAsData) 
      } 
     } 
     return nil 
    } 

错误：

名为let imageDirPath变量：

stringByAppendingPathComponent”不可使用 URLByAppendingPathComponent上NSURL代替

对于变量let fullPath

悬而未决标识符stringByAppendingPathComponent

Answer 1

stringByAppendingPathComponent(str:)的使用从String在夫特2.0移除。它仍然是工作NSString所以你可以使用它像这样：

let docsPath: NSString = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] 
let imageDirPath: NSString = docsPath.stringByAppendingPathComponent("SwiftDataImages") 
let fullPath = imageDirPath.stringByAppendingPathComponent(path) 

声明docsPath和imageDirPath为NSString。