Swift 1.2爲什麼我不能繼承任何NSCell的子類？

Question

爲什麼我不能繼承NSCell的任何子類？ 我想繼承MyButtonCell，這是CustomButtonCell: NSButtonCell。含義

class MyCustomButtonCell: MyButtonCell { } 

總是給我下面的錯誤：

<unknown>:0: error: declaration has a different @objc name from the declaration it overrides ('initTextCell:' vs. 'initWithTextCell:') 
Custom_Controls.MyButtonCell:9:24: note: overridden declaration is here 
    @objc @objc override init(textCell aString: String) 
        ^
<unknown>:0: error: declaration has a different @objc name from the declaration it overrides ('initImageCell:' vs. 'initWithImageCell:') 
Custom_Controls.MyButtonCell:10:24: note: overridden declaration is here 
    @objc @objc override init(imageCell image: NSImage?) 
        ^

簡單的步驟來重現我的問題：

1. 打開終端

2. 類型：swift（如果你有最新的Xcode 6.3.1）

3. 當你得到，

   Welcome to Swift version 1.2. Type :help for assistance.

類型如下：

1> import AppKit 
2> class Foo : NSCell {} 
3> class Bar : Foo {} 

你會得到這些錯誤：

declaration has a different @objc name from the declaration it overrides ('initTextCell:' vs. 'initWithTextCell:')__lldb_expr_9.Foo:3:24: note: overridden declaration is here @objc @objc override init(textCell aString: String) ^ declaration has a different @objc name from the declaration it overrides ('initImageCell:' vs. 'initWithImageCell:')__lldb_expr_9.Foo:4:24: note: overridden declaration is here @objc @objc override init(imageCell image: NSImage?) ^

爲什麼？有沒有解決這個問題的方法？

僅供參考：Swift 1.1沒有這個問題！

Answer 1

看來，並稱符合NSCoding的init方法去除錯誤：

import AppKit 
class Foo : NSCell { 
    required init(coder aDecoder: NSCoder) { 
     super.init(coder: aDecoder) 
    } 
} 
class Bar : Foo {}