how to draw a graph having x value but no values in y

[milanhap]

i entry all data in yVals no data with having xIndex.
for example
Suppose: xIndexes ["Apples", "Oranges", "Strawberries"] and just set: yVals [].
i got erorr in below line
let entryFrom = dataSet.entryForXIndex(_minX)! // nil while unwrapping an Optional value
any solutation to draw graph in above condition

[liuxuan30]

I have no problem drawing such charts with charts demo.
try like below:

    NSMutableArray *xVals = [[NSMutableArray alloc] init];

    for (int i = 0; i < count; i++)
    {
        [xVals addObject:months[i % 12]];
    }
    BarChartDataSet *set1 = [[BarChartDataSet alloc] initWithYVals:@[] label:@"DataSet"];
    set1.barSpace = 0.35;

    NSMutableArray *dataSets = [[NSMutableArray alloc] init];
    [dataSets addObject:set1];

    BarChartData *data = [[BarChartData alloc] initWithXVals:xVals dataSets:dataSets];
    [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:10.f]];

    _chartView.data = data;