重写== Equatable类型的函数未调用子类NSCoding和NSObject的自定义类

Question

FooBar下面的类必须覆盖==该Equatable类型的功能.

但是,调用对象contains数组FooBar不会导致==调用自定义函数内的断点.是否可能其他==功能覆盖此自定义功能？

注意:因为FooBar必须从NSCoding和NSObject继承,所以FooBar不会将Equatable列为协议,因为它会导致此错误:

'FooBar'与协议'Equatable'的冗余一致性

func ==(lhs: FooBar, rhs: FooBar) -> Bool {
    return lhs.id == rhs.id
}

class FooBar: NSObject, NSCoding {
     // Class def
}

// Both serverFooBars and gFooBars are [FooBar]
let newFooBars = serverFooBars.filter { !gFooBars.contains($0) }

Answer 1

因为您的类继承自NSObject您不需要使用swift协议,所以Equatable您必须覆盖该NSObject方法isEquals:

Swift 3.x

class FooBar: NSObject, NSCoding {
  override func isEqual(_ object: Any?) -> Bool {
    return id == (object as? FooBar)?.id
  }
}

(感谢堪​​察加)

Swift 2.x

class FooBar: NSObject, NSCoding {
  override func isEqual(object: AnyObject?) -> Bool {
    return id == (object as? FooBar)?.id
  }
}