How to pass data to a custom class(subview) drawRect function?

Question

Edit:

I'm drawing a line using drawRect: function which resides in a custom class in a view which I created in the MainStoryboard.storyboard file. The view does point to the custom class (draw2D) in the interface builder.

All code i have regarding draw in my main file(viewController) is now: (header file)

@class draw2D;  
@property (weak, nonatomic) IBOutlet draw2D *draw;  

(m file)

#import "draw2D.h"  
[draw.listOfFreqToDraw addObject: closestChar];   
[draw setNeedsDisplay];

The problem I seem to have now is that it only runs the drawRect method in draw2D class once and never calls it again (therefor listOfFreqToDraw isn't even called after the first run)

Answer 1

You can always change a variable in draw2D

Set this up in the draw2D.h

@property (nonatomic, strong) NSMutableArray * listOfFreqToDraw;

in draw2D.m

- (void)drawRect:(CGRect)rect {
 for (UIBezierPath *path in self. listOfFreqToDraw) {
    [path stroke]; 
   }
}

and in your main class

[draw.listOfFreqToDraw addObject: closestChar];
[draw setNeedsDisplay];