SWIFT 3换算，导致（LLDB）错误`EXC_BAD_INSTRUCTION（代码= EXC_I386_INVOP，子码）= 0x0`

Question

转换我的代码为SWIFT 3之后，我的一个错误：

noteObjects.sort (comparator: { (first : AnyObject, second : AnyObject) -> ComparisonResult in 

      if let f : String = (first as! RChannels).name! { 
      let s : String = (second as! RChannels).name! 

       return f.compare(s) 
      } 

     } as! (Any, Any) -> ComparisonResult) // error here 

此行as! (Any, Any) -> ComparisonResult)是给我（lldb）没有任何其他描述的错误，任何人都可以解释这里有什么问题？和转换之前是这样的：

noteObjects.sortUsingComparator { (first : AnyObject, second : AnyObject) -> NSComparisonResult in 
     if let f : String = (first as! RChannels).name! { 
      let s : String = (second as! RChannels).name! 
      return f.compare(s) 
     } 
    } 

noteObjects是NSMutableArray的

Answer 1

摆脱as! (Any, Any) -> ComparisonResult和两个参数更改为Any，而不是AnyObject。

noteObjects.sort(comparator: { (first : Any, second : Any) -> ComparisonResult in 
    if let f : String = (first as! RChannels).name! { 
     let s : String = (second as! RChannels).name! 

     return f.compare(s) 
    } 
}) 

但这仍然有一些问题。您没有每个代码路径的return值，并且您没有正确处理可选项。下面会更好：

noteObjects.sort(comparator: { (first : Any, second : Any) -> ComparisonResult in 
    if let f = (first as! RChannels).name, let s = (second as! RChannels).name { 
     return f.compare(s) 
    } else { 
     return .orderedSame 
    } 
})