Swift switch case编译错误

概述以下代码是WWDC中的中级 Swift谈话示例的派生.我要做的是从一个键属性列表初始化一个模型类,它来自某种API. class Movie { var title: String init(title: String) { self.title = title }}func movieFromDictionary(dict: Dictionary<String, An 以下代码是WWDC中的中级 Swift谈话示例的派生.我要做的是从一个键属性列表初始化一个模型类,它来自某种API.

class MovIE {  var Title: String  init(Title: String) {    self.Title = Title  }}func movIEFromDictionary(dict: Dictionary<String,AnyObject>) -> MovIE? {  switch dict["Title"] {  case .some(let movIETitle as String):    return MovIE(Title: movIETitle)  default:    return nil  }}

当我尝试编译这些时,我收到以下错误：

Bitcast requires both operands to be pointer or neither  %38 = bitcast i8* %37 to %sS,!dbg !161InvalID operand types for ICmp instruction  %39 = icmp ne %sS %38,null,!dbg !161PHI nodes must have at least one entry.  If the block is dead,the PHI should be removed!  %42 = phi i64,!dbg !161PHI node operands are not the same type as the result!  %41 = phi i8* [ %38,%34 ],!dbg !161LLVM ERROR: broken function found,compilation aborted!Command /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift Failed with exit code 1

有趣的是编辑器似乎对代码没问题.这是编译器错误还是代码有问题？

解决方法 我同意评论者这是一个编译器错误,你应该向苹果报告.但是,您也可以通过这种方式实现它,这更简单,应该可以正常工作：

func movIEFromDictionary(dict: Dictionary<String,AnyObject>) -> MovIE? {  if let Title = dict["Title"] as? String {    return MovIE(Title: Title)  }  else {    return nil  }}

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