问shinobi图表中的堆叠条形图和折线图

EN

- (SChartSeries*)sChart:(ShinobiChart *)chart seriesAtIndex:(NSInteger)index {
    if(index == 3) {
        // Index 3 will be the line series
        SChartLineSeries* lineSeries = [[SChartLineSeries alloc] init];
        // Put it in the stack group indexed by the number 0
        lineSeries.stackIndex = @0;
        return lineSeries;
    } else { // index = 0, 1, 2
        // The other indices represent the columns
        SChartColumnSeries *columnSeries = [SChartColumnSeries new];
        // Put them all in the same stack group (indexed by the number 1)
        columnSeries.stackIndex = @1;
        return columnSeries;
    }
}