StackOverflow2013

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copied!<ol> <li>A method in the UIViewController should recognize when the slider values changes</li> <li>the same method should trigger another methode within the UIViewController to update/recalculate the sine function values (e.g. creating an value array)</li> <li>at the end of the update-methode the necessary values are transferred to the UIView via an outlet from UIViewController to the UIView (the UIView is an property of the UIViewController)</li> <li>the UIView is drawing the new sine-function in draw rect</li> </ol> <p>Edit 1: your ViewController.h:</p> <pre><code>#import <UIKit/UIKit.h> @class YourGraphUIView; // that's you view where you draw @interface ResultViewController: UIViewController @property (weak, nonatomic) IBOutlet UISlider *valueFromSlider; //bound to your UISlider @property (weak) IBOutlet YourGraphUIView *yourGraphUIView; //bound to your costumUIView @property (nonatomic, retain) NSNumber *graphValue; - (IBAction)takeSliderValue:(id)sender; //bound to your UISlider @end </code></pre> <p>your ViewController.m:</p> <pre><code>#import "ResultViewController.h" #import "YourGraphUIView.h" @interface ResultViewController () @end @implementation ResultViewController @synthesize yourGraphUIView, valueFromSlider, graphValue; - (IBAction)takeSliderValue:(UISlider *)sender{ graphValue = [NSNumber numberWithDouble:[(double)sender.value]]; //takes value from UISlider yourGraphUIView.graphValue = graphValue; //gives the value to the yourGraphUIView [self.yourGraphUIView setNeedsDisplay] //<--- important to redraw UIView after changes } end </code></pre> <p>your YourGraphUIView.h:</p> <pre><code>#import <UIKit/UIKit.h> @interface YourGraphUIView : UIView @property(nonatomic, retain)NSNumber *graphValue; - (void)drawRect:(CGRect)dirtyRect; @end </code></pre> <p>your YourGraphUIView.m:</p> <pre><code>#import "YourGraphUIView.h" @implementation YoutGraphUIView @synthesize graphValue; //... init, draw rect with using the graphValue for calculating and updating the graph end; </code></pre> <p>I hope this helped. You should have a look how to build the GUI and how to connect the UIViews. You need to set the custom classes for the ViewController and the YourGraphUIView as well. Good luck!</p>

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