CODEWITHSUNDEEP
objective-ccocoa-touchnsarraycore-plot
Juan Andres
Juan Andres

Reputation: 433

Pass NSArrays from ViewController to NSObject class

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?

Upvotes: 0

Views: 839

Answers (3)

Mike
Mike

Reputation: 61

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.

Upvotes: 0

Jeremy
Jeremy

Reputation: 9030

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];
}

Upvotes: 1

nkongara
nkongara

Reputation: 1229

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;

Upvotes: 1

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