¿Cómo implementar un gráfico de barras en iPhone?

Question

estoy trabajando en el gráfico de barras sencilla aplicación, uso de para desarrollar esta aplicación, entonces trato de poner en práctica el gráfico de barras, pero me sale el tema que se encuentra en

[__NSCFConstantString sizeWithTextStyle:]: unrecognized selector sent to instance 0x7fb4c' 
    First throw call stack: 

Cómo solucionar este problema? por favor ayúdame

Gracias de antemano

He intentado esto:

Viewcontroller.h

#import <UIKit/UIKit.h> 
#import "CorePlot-CocoaTouch.h" 


@interface GraphViewController : UIViewController <CPTPlotDataSource> 
{ 
    CPTXYGraph *barChart; 
    NSTimer *timer; 
    NSMutableArray *samples; 
} 

-(void) getGraphValues; 

@end 

Viewcontroller.m

- (void)viewDidLoad 
    { 
     [super viewDidLoad]; 

     self.view.backgroundColor=[UIColor whiteColor]; 
     self.title = @"Sample"; 
     self.navigationController.navigationBar.barStyle = UIBarStyleBlack; 
     [self.navigationController setNavigationBarHidden:NO]; 

     [self getGraphValues]; 

     double xAxisLength = [samples count]; 

     barChart = [[CPTXYGraph alloc] initWithFrame:CGRectMake(0, 0, 320, 380)]; 

     barChart.plotAreaFrame.borderLineStyle = nil; 
     barChart.plotAreaFrame.cornerRadius = 0.0f; 

     barChart.paddingLeft = 0.0f; 
     barChart.paddingRight = 0.0f; 
     barChart.paddingTop = 0.0f; 
     barChart.paddingBottom = 0.0f; 

     barChart.plotAreaFrame.paddingLeft = 60.0; 
     barChart.plotAreaFrame.paddingTop = 40.0; 
     barChart.plotAreaFrame.paddingRight = 10.0; 
     barChart.plotAreaFrame.paddingBottom = 40.0; 

     barChart.title = @"Sample Innovations"; 

     CPTMutableTextStyle *textStyle = [CPTTextStyle textStyle]; 
     textStyle.color = [CPTColor grayColor]; 
     textStyle.fontSize = 16.0f; 
     textStyle.textAlignment = CPTTextAlignmentCenter; 
     barChart.titleTextStyle = textStyle; // Error found here 
     barChart.titleDisplacement = CGPointMake(0.0f, -10.0f); 
     barChart.titlePlotAreaFrameAnchor = CPTRectAnchorTop; 

     CPTXYAxisSet *axisSet = (CPTXYAxisSet *)barChart.axisSet; 
     CPTXYAxis *x = axisSet.xAxis; 
     x.axisLineStyle = nil; 
     x.majorTickLineStyle = nil; 
     x.minorTickLineStyle = nil; 
     x.majorIntervalLength = CPTDecimalFromString(@"10"); 
     x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0"); 
     x.title = @"Names"; 
     x.titleLocation = CPTDecimalFromFloat(7.5f); 
     x.titleOffset = 25.0f; 

     // Define some custom labels for the data elements 
     x.labelRotation = M_PI/5; 
     x.labelingPolicy = CPTAxisLabelingPolicyNone; 

     NSArray *customTickLocations = [NSArray arrayWithObjects:[NSDecimalNumber numberWithInt:0], [NSDecimalNumber numberWithInt:1], [NSDecimalNumber numberWithInt:2], [NSDecimalNumber numberWithInt:3], [NSDecimalNumber numberWithInt:4], nil]; 


     NSArray *xAxisLabels = [NSArray arrayWithObjects:@"a", @"b", @"c", @"d", @"e", nil]; 
     NSUInteger labelLocation = 0; 

     NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[xAxisLabels count]]; 
     for (NSNumber *tickLocation in customTickLocations) 
     { 
      CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:x.labelTextStyle]; 
      newLabel.tickLocation = [tickLocation decimalValue]; 
      newLabel.offset = x.labelOffset + x.majorTickLength; 
      newLabel.rotation = M_PI/xAxisLength; 
      [customLabels addObject:newLabel]; 
     } 

     x.axisLabels = [NSSet setWithArray:customLabels]; 

     CPTXYAxis *y = axisSet.yAxis; 
     y.axisLineStyle = nil; 
     y.majorTickLineStyle = nil; 
     y.minorTickLineStyle = nil; 
     y.majorIntervalLength = CPTDecimalFromString(@"50"); 
     y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0"); 
     y.title = @"Work Status"; 
     y.titleOffset = 40.0f; 
     y.titleLocation = CPTDecimalFromFloat(150.0f); 

     CPTGraphHostingView *hostingView = [[CPTGraphHostingView alloc] initWithFrame:CGRectMake(0, 0, 320, 360)]; 
     hostingView.hostedGraph = barChart; 
     [self.view addSubview:hostingView]; 

     CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) barChart.defaultPlotSpace; 
     plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0.0f) length:CPTDecimalFromDouble(16.0f)]; 
     plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0.0f) length:CPTDecimalFromDouble(500.0f)]; 

     CPTBarPlot *barPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor blueColor] horizontalBars:NO]; 
     barPlot.plotRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0.0) length:CPTDecimalFromDouble(10)];//xAxisLength 
     barPlot.barOffset = CPTDecimalFromFloat(0.25f); 
     barPlot.baseValue = CPTDecimalFromString(@"0"); 
     barPlot.barWidth = CPTDecimalFromFloat(10.0f); 
     barPlot.cornerRadius = 2.0f; 
     barPlot.dataSource = self; 
     [barChart addPlot:barPlot]; 
    } 

    -(void) getGraphValues 
    { 
     int barValues [] = {10,50,100,200};//,150,200,10,20,30,40,50,100,400,450,350 
     int barNums = sizeof(barValues)/sizeof(int); 

     samples = [[NSMutableArray alloc] initWithCapacity:barNums]; 

     for (int i = 0; i < 4; i++) 
     { 
      double x = i; 
      double y = barValues[i]; 
      NSLog(@"XVal : %@", X_VAL); 
      NSDictionary *sample = [NSDictionary dictionaryWithObjectsAndKeys: 
            [NSNumber numberWithDouble:30],X_VAL,[NSNumber numberWithDouble:y],Y_VAL,nil]; 
      [samples addObject:sample]; 
     } 
    } 


-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot 
{ 
    return [samples count]; 
} 

-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index 
{ 
    NSDictionary *sample = [samples objectAtIndex:index]; 

    if (fieldEnum == CPTScatterPlotFieldX) 
     return [sample valueForKey:X_VAL]; 
    else 
     return [sample valueForKey:Y_VAL]; 
} 

Answer 1

Asegúrate de configurar el -all_load "otro indicador del enlazador" en la configuración de compilación. Esa bandera obliga al sistema a cargar todos los métodos de categoría como -sizeWithTextStyle:.

Answer 2

Como Eric ha explicado, debe buscar el distintivo -all_load en la configuración de compilación. En caso de que se pregunte dónde está exactamente, eche un vistazo a esta imagen. ¡Buena suerte!