Question

Using the code below in coreplot(Barchart) to perform segue from GraphView.m class

but I get an error: instance method '-performSegueWithIdentifier:sender:' not found (return type defaults to 'id')

How do I fix it ? Please Help .
Thanks in Advance.

-(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index
    {
        NSLog(@"barWasSelectedAtRecordIndex %d", index);

         [self performSegueWithIdentifier:@"list2" sender:self];
    }

Answer 1

If GraphView.m is a UIView you won’t get very far, as performSegueWithIdentifier:sender is a UIViewController method.

Assuming that graphView is created from a viewController, you want to set it’s delegate to the viewController.

in GraphView.h

• declare a graphView protocol above your @interface:

  @protocol GraphViewDelegate
-(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index
@end

• declare a property:

  @property (weak) id <GraphViewDelegate> delegate;

in GraphView.m:

-(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index
    {
        [[self delegate] barPlot:plot barWasSelectedAtRecordIndex:index];
    } 

in ViewController.h modify the @interface line

@interface MyViewController: UIViewController <GraphViewDelegate>

in ViewController.m

• when you create the graphView, set the delegate to self (if graphView is created in Interface Builder, you can CTRL-drag a line to the viewController to set the delegate):

  GraphView* graphView = [GraphView alloc] init];
[graphView setDelegate:self];

• implement the delegate method as you had it in GraphView (you may not need the index parameter but I carried it over anyway)..

  -(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index
   {
      [self performSegueWithIdentifier:@"list2" sender:self];
   }
  

You probably want to modify your method signature, to something like

            -(void)graphView:(GraphView*)graphView 
         didSelectBarAtIndex:(NSUInteger)index 
                     barPlot:(CPTBarPlot *)plot 

 (it's good practice to send a reference to the sender along with the message)