IOS CorePlot - a line chart with a date on the x axis and double numbers on the y axis

I used CPTScatterPlotto display a graph of time series data like yours.

, . NSArray : observationDate observationValue. CPTPlotDataSource. , :

#pragma mark- CPPlotDataSource protocol methods
- (NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
   // return the number of objects in the time series
   return [self.timeSeries count];
}

-(NSNumber *)numberForPlot:(CPTPlot *)plot 
                     field:(NSUInteger)fieldEnum 
               recordIndex:(NSUInteger)index 
{
  NSNumber * result = [[NSNumber alloc] init];
  // This method returns x and y values.  Check which is being requested here.
  if (fieldEnum == CPTScatterPlotFieldX)
  { 
    // x axis - return observation date converted to UNIX TS as NSNumber
    NSDate * observationDate = [[self.timeSeries objectAtIndex:index] observationDate];
    NSTimeInterval secondsSince1970 = [observationDate timeIntervalSince1970];
    result = [NSNumber numberWithDouble:secondsSince1970]; 
  }
  else
  { 
    // y axis - return the observation value
    result = [[self.timeSeries objectAtIndex:index] observationValue];
  }
  return result;
}

, , . , , min/max - PlotSpace .

, dataSource CPTScatterPlot:

...
CPTXYGraph * myGraph = [[CPTXYGraph alloc] initWithFrame:self.bounds];

// define your plot space here (xRange, yRange etc.)
...

CPTScatterPlot * myPlot = [[CPTScatterPlot alloc] initWithFrame:graph.defaultPlotSpace.accessibilityFrame];

// graphDataSource is your data source class
myPlot.dataSource = graphDataSource;
[myGraph addPlot:myPlot];
...

CPTTestApp . , , . !