Swift 2D阵列扩展 [英] Swift 2D Array Extension

问题描述

我正在尝试对Array类型进行扩展，以便能够使用2D数组.实际上，我是在Objective-C中完成的，下面的代码像个魅力一样工作.但是我真的迷上了Swift.

I'm trying to make an Extension to the Array type so to be able to work with 2D arrays. In fact, I did this in Objective-C and the code below worked like a charm. But I really stuck in Swift.

extension Array {
    mutating func addObject(anObject : AnyObject, toSubarrayAtIndex idx : Int) {
        while self.count <= idx {
            let newSubArray = [AnyObject]()
            self.append(newSubArray)
        }

        var subArray = self[idx] as! [AnyObject]
        subArray.append(anObject)
    }

    func objectAtIndexPath(indexPath : NSIndexPath) -> AnyObject {
        let subArray = self[indexPath.section] as! Array
        return subArray[indexPath.row] as! AnyObject
    }
}

无论我做什么我都会收到此错误:

I get this error no matter what I do:

错误:无法使用类型为([[AnyObject])'的参数列表调用'append'

Error: Cannot invoke 'append' with an argument list of type '([AnyObject])'

我将不胜感激.

推荐答案

@brimstone的答案很接近，但是如果我正确理解了您的问题，它就是一个 [AnyObject] 的数组，这意味着它应该看起来像这样:

@brimstone's answer is close, but if I understand your question correctly, it is an array of [AnyObject], which means it should look like this:

extension Array where Element: _ArrayType, Element.Generator.Element: AnyObject {
    mutating func addObject(anObject : Element.Generator.Element, toSubarrayAtIndex idx : Int) {
        while self.count <= idx {
            let newSubArray = Element()
            self.append(newSubArray) // ERROR: Cannot invoke 'append' with an argument list of type '([AnyObject])'
        }

        var subArray = self[idx]
        subArray.append(anObject)
    }

    func objectAtIndexPath(indexPath: NSIndexPath) -> AnyObject {
        let subArray = self[indexPath.indexAtPosition(0)]
        return subArray[indexPath.indexAtPosition(1)] as Element.Generator.Element
    }
}

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