ChartYAxis how to show only NSInteger?

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used NSNumberFormatter But the show is not good
`ChartXAxis *xAxis = _chartView.xAxis;
xAxis.labelPosition = XAxisLabelPositionBottom;
xAxis.labelFont = [UIFont systemFontOfSize:10.f];
xAxis.drawGridLinesEnabled = NO;
xAxis.granularity = 1.0; // only intervals of 1 day
xAxis.labelCount = 7;

NSNumberFormatter *leftAxisFormatter = [[NSNumberFormatter alloc] init];
leftAxisFormatter.numberStyle = kCFNumberFormatterNoStyle;
ChartYAxis *leftAxis = _chartView.leftAxis;
leftAxis.labelFont = [UIFont systemFontOfSize:10.f];
leftAxis.labelCount = 8;
leftAxis.valueFormatter = [[ChartDefaultAxisValueFormatter alloc] initWithFormatter:leftAxisFormatter];
leftAxis.labelPosition = YAxisLabelPositionOutsideChart;
leftAxis.spaceTop = 0.15;
leftAxis.axisMinimum = 0.0; // this replaces startAtZero = YES

ChartYAxis *rightAxis = _chartView.rightAxis;
rightAxis.enabled = YES;
rightAxis.drawGridLinesEnabled = NO;
rightAxis.labelFont = [UIFont systemFontOfSize:10.f];
rightAxis.labelCount = 8;
rightAxis.valueFormatter = leftAxis.valueFormatter;
rightAxis.spaceTop = 0.15;
rightAxis.axisMinimum = 0.0; // this replaces startAtZero = YES`

Start by tracing ChartYAxis configuration and ChartDefaultAxisValueFormatter, using the Objective-C example in the issue as the entry point. Reproduce the reported axis labels and determine whether the formatter or axis settings control the unwanted values; done means the Y-axis displays only integer labels as requested.

Written by the indexing model from the issue text.