使用选择器初始化的覆盖方法在Swift中具有不兼容的类型

永零

我是Swift的新手，我想像下面这样子类化：

public class CombinedChartRenderer: ChartDataRendererBase {

    private weak var _chart: CombinedChartView!

    public init(chart: CombinedChartView, animator: ChartAnimator, viewPortHandler: ChartViewPortHandler)
    {
        super.init(animator: animator, viewPortHandler: viewPortHandler)

        _chart = chart

        createRenderers()
    }
}

public class MyCombinedChartRenderer: CombinedChartRenderer {
    private weak var _chart: MyCombinedChartView!
    public override init(chart: MyCombinedChartView, animator: ChartAnimator, viewPortHandler: ChartViewPortHandler)
    {
        super.init(chart: chart, animator: animator, viewPortHandler: viewPortHandler)

        _chart = chart
    }
}

总是说

Overriding method with selector 'initWithChart:animator:viewPortHandler:' has incompatible type '(MyCombinedChartView, ChartAnimator, ChartViewPortHandler) -> MyCombinedChartRenderer'

我不确定这是怎么回事。我看到其他代码可以通过提供更专门的子类来完成此类初始化。

CombinedChartView类似于：

public class CombinedChartView: BarLineChartViewBase
{
...
}

public class MyCombinedChartView: CombinedChartView
{
    // do some customization and override
}

Shoaib

只需更改一些变量名，冲突并使用init删除该override关键字即可；

public class CombinedChartRenderer: ChartDataRendererBase {

    private weak var _chart: CombinedChartView!

    public init(chart: CombinedChartView, animator: ChartAnimator, viewPortHandler: ChartViewPortHandler)
    {
        super.init(animator: animator, viewPortHandler: viewPortHandler)

        _chart = chart

        createRenderers()
    }
}

public class MyCombinedChartRenderer: CombinedChartRenderer {
    private weak var _myChart: MyCombinedChartView!
    public init(myChart: MyCombinedChartView, animator: ChartAnimator, viewPortHandler: ChartViewPortHandler)
    {
        super.init(chart: myChart, animator: animator, viewPortHandler: viewPortHandler)

        _myChart = myChart // This can be removed by marking baseclass instance '_chart' as public; 
    }
}

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