user3428151 user3428151 - 3 months ago 10
iOS Question

How to show Line label with two digits after dote?

i use a core plot in my Xcode project and have a problem with plot values.

How can i show number on the CPTScatterPlot?
My plot shows me only one digit after dot (36.6).
For example show me 36.665 or 36.001?

I add a screen preview.

How show 36.21

INIT

-(void)initLinePlotTmp
{
//Initialize and display Graph (x and y axis lines)
self.graph = [[CPTXYGraph alloc] initWithFrame:self.graphView.bounds];
self.hostView = [[CPTGraphHostingView alloc] initWithFrame:self.graphView.bounds];
self.hostView.hostedGraph = self.graph;
[self.graphView addSubview:hostView];

//apply styling to Graph
[self.graph applyTheme:[CPTTheme themeNamed:kCPTPlainWhiteTheme]];

//set graph backgound area transparent
self.graph.backgroundColor = nil;
self.graph.fill = nil;
self.graph.plotAreaFrame.fill = nil;
self.graph.plotAreaFrame.plotArea.fill = nil;

//This removes top and right lines of graph
self.graph.plotAreaFrame.borderLineStyle = nil;
//This shows x and y axis labels from 0 to 1
self.graph.plotAreaFrame.masksToBorder = NO;

// set padding for graph from Left and Bottom
self.graph.paddingBottom = 10;
self.graph.paddingLeft = 50;
self.graph.paddingRight = 0;
self.graph.paddingTop = 10;

//Define x and y axis range
// x-axis from 0 to 100
// y-axis from 0 to 300
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)self.graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(plotXMinRange)
length:CPTDecimalFromInt(plotXMaxRange)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(plotYMinRange)
length:CPTDecimalFromInt(plotYMaxRange)];

CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet;

NSNumberFormatter *axisLabelFormatter = [[NSNumberFormatter alloc]init];
[axisLabelFormatter setGeneratesDecimalNumbers:NO];
[axisLabelFormatter setNumberStyle:NSNumberFormatterDecimalStyle];


//Define x-axis properties
//x-axis intermediate interval 2
axisSet.xAxis.majorIntervalLength = CPTDecimalFromInt(plotXInterval);
axisSet.xAxis.minorTicksPerInterval = 1;
axisSet.xAxis.minorTickLength = 5;
axisSet.xAxis.majorTickLength = 7;
axisSet.xAxis.title = @"Time(Hours)";
axisSet.xAxis.titleOffset = 25;
axisSet.xAxis.labelFormatter = axisLabelFormatter;

//Define y-axis properties
//y-axis intermediate interval = 50;
axisSet.yAxis.majorIntervalLength = CPTDecimalFromInt(plotYInterval);
axisSet.yAxis.minorTicksPerInterval = 4;
axisSet.yAxis.minorTickLength = 5;
axisSet.yAxis.majorTickLength = 7;
axisSet.yAxis.title = @"Temperature";
axisSet.yAxis.titleOffset = 30;
axisSet.yAxis.labelFormatter = axisLabelFormatter;


//Define line plot and set line properties
self.linePlot = [[CPTScatterPlot alloc] init];
self.linePlot.dataSource = self;
[self.graph addPlot:self.linePlot toPlotSpace:plotSpace];

//set line plot style
CPTMutableLineStyle *lineStyle = [self.linePlot.dataLineStyle mutableCopy];
lineStyle.lineWidth = 2;
lineStyle.lineColor = [CPTColor blackColor];
self.linePlot.dataLineStyle = lineStyle;

CPTMutableLineStyle *symbolineStyle = [CPTMutableLineStyle lineStyle];
symbolineStyle.lineColor = [CPTColor blackColor];
CPTPlotSymbol *symbol = [CPTPlotSymbol ellipsePlotSymbol];
symbol.fill = [CPTFill fillWithColor:[CPTColor blackColor]];
symbol.lineStyle = symbolineStyle;
symbol.size = CGSizeMake(3.0f, 3.0f);
self.linePlot.plotSymbol = symbol;

//set graph grid lines
CPTMutableLineStyle *gridLineStyle = [[CPTMutableLineStyle alloc] init];
gridLineStyle.lineColor = [CPTColor grayColor];
gridLineStyle.lineWidth = 0.5;
axisSet.xAxis.majorGridLineStyle = gridLineStyle;
axisSet.yAxis.majorGridLineStyle = gridLineStyle;


}


this is my function for plot init.

Answer

Create a NSNumberFormatter and configure it to format the labels however you want. Set the labelFormatter on the plot to the new formatter.

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