Swift 1.2 为什么我不能继承任何NSCell 的子类？

Question

为什么我不能继承 NSCell 的任何子类？我想继承 MyButtonCell，即 CustomButtonCell: NSButtonCell。含义

class MyCustomButtonCell: MyButtonCell { }

总是给我以下错误：

<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?)
                       ^

重现我的问题的简单步骤：

打开终端
类型：swift（如果你有最新的Xcode 6.3.1）
当你得到时，

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

键入以下内容：

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

你会得到这些错误：

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?) ^

为什么？有办法解决这个问题吗？

仅供参考：Swift 1.1 没有这个问题！

Answer 1

貌似加入一个符合NSCoding的init方法就去掉了错误：

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

Swift 1.2 为什么我不能继承任何NSCell 的子类？

Swift 1.2 Why cannot I subclass any NSCell's subclass?

macos

objective-c

nscell

swift