Pass NSArrays from ViewController to NSObject class - objective-c

Question

I have a single view application where the ViewController contains a UIView of custom class CPTGraphHostingView so that it holds a CorePlot graph. The content of that UIView is managed by an NSObject sub-class called SimpleScatterPlot. This SimpleScatterPlot object holds all the parameters needed to configure the graph (axis ranges, labels, number of points, etc.)
ViewController.h
#import <UIKit/UIKit.h>
#import "CorePlot-CocoaTouch.h"
#import "SimpleScatterPlot.h"
#interface ViewController : UIViewController
{
IBOutlet CPTGraphHostingView *_graphHostingView;
SimpleScatterPlot *_scatterPlot;
NSMutableData *dataConexion;
}
#property (nonatomic,strong) NSArray *valor;
#property (nonatomic,strong) NSArray *strAnoMes;
#property (nonatomic,strong) NSArray *indicador;
#property (nonatomic, retain) SimpleScatterPlot *scatterPlot;
#end
In ViewController.m I have some methods to initialise a few arrays from some JSON data:
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize indicador,valor,strAnoMes;
- (void)viewDidLoad
{
[super viewDidLoad];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
NSString *urlString = #"http://xxxx/ios/datosgrafica.php";
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
(void)[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
dataConexion = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData
{
[dataConexion appendData:theData];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
indicador = [NSJSONSerialization JSONObjectWithData:dataConexion options:nil error:nil];
// ARRAYS OF INTEREST
strAnoMes = [indicador valueForKey:#"StrAnoMes"];
valor = [indicador valueForKey:#"Valor"];
self.scatterPlot = [[SimpleScatterPlot alloc] initWithHostingView:_graphHostingView andData:pointArray];
[self.scatterPlot initialisePlot];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
UIAlertView *errorView = [[UIAlertView alloc] initWithTitle:#"Error" message:#"The download could not complete - please make sure you're connected to either 3G or Wi-Fi." delegate:nil cancelButtonTitle:#"Dismiss" otherButtonTitles:nil];
[errorView show];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
In the SimpleScatterPlot.m I would like to use the array "valor" to configure axis ranges, and I would like to use the array "strAnoMes" to draw custom labels in the xAxis.
What do I have to do so that I can pass those arrays defined in ViewController to SimpleScatterPlot?
I have tried to #import "ViewController.h" but it gives me errors. Any other ideas? What is the best way to approach this situation?

Answer 1

You can take two properties in SimpleScatterPlot.
SimpleScatterPlot.h
#property (nonatomic, retain) NSArray * strAnoMes;
#property (nonatomic, retain) NSArray * valor;
SimpleScatterPlot.m
#synthesize strAnoMes;
#synthesize valor;
In ViewController.m, After creating scatterPlot in connectionDidFinishLoading:, assign the values to above properties as below.
self.scatterPlot.strAnoMes = strAnoMes;
self.scatterPlot.valor = valor;

Answer 2

One way to do this is to create a simple data object and pass it directly into your SimpleScatterPlot object:
Data Object:
#interface SimpleScatterPlotData : NSObject
#property (...) NSArray *valor;
#property (...) NSArray *strAnoMes;
#end
#implementaton SimpleScatterPlotData
#synthesize valar;
#synthesize strAnoMes;
-(void)dealloc
{
...
...
[super dealloc];
}
#end
Implement a load method in your SimpleScatterPlot class:
#interface SimpleScatterPlot
-(void)loadData:(SimpleScatterPlotData *)data;
#end
#implementation SimpleScatterPlot
-(void)loadData:(SimpleScatterPlotData *)data
{
NSArray *valor = data.valor;
NSArray *strAnoMes = data.strAnoMes;
/*
Do something
*/
}
#end
Then in your ViewController class:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
indicador = [NSJSONSerialization JSONObjectWithData:dataConexion options:nil error:nil];
// ARRAYS OF INTEREST
strAnoMes = [indicador valueForKey:#"StrAnoMes"];
valor = [indicador valueForKey:#"Valor"];
SimpleScatterPlotData *data = [[[SimpleScatterPlotData alloc] init] autorelease];
data.valor = valor;'
data.strAnoMes = strAnoMes;
self.scatterPlot = [[SimpleScatterPlot alloc] initWithHostingView:_graphHostingView andData:pointArray];
[self.scatterPlot loadData:data];
}

Answer 3

You could also change your current initializer or add a new initializer to your SimpleScatterPlot class so that you pass those arrays in when you alloc the object. So your the call to your initializer would look something like:
self.scatterPlot = [[SimpleScatterPlot alloc] initWithHostingView:_graphHostingView andData:pointArray andValor:valor andstrAnoMes:strAnoMes];
Then in your initializer you can set the object properties to those passed in values.