Creating a realistic Strum on iPhone?

So I have a guitar application that plays chords, like an autoharp. I have created the following UIView class to turn a swipe into a strum as the user's fingers swipe across the strings.

#import "swipetest.h"


@implementation swipetest

@synthesize eStringButton, aStringButton, dStringButton, gStringButton, bStringButton, ehStringButton;



- (void)viewDidLoad {
[NSThread detachNewThreadSelector:@selector(isolateStrums) toTarget:self withObject:nil]; }



- (void)isolateStrums {  

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];  
[self performSelectorOnMainThread:@selector(touchesMoved) withObject:nil waitUntilDone:NO];  
[pool release];  

}  
- (void开发者_Python百科)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{

CGPoint location = [[touches anyObject] locationInView:self];
UIView *subview = [self hitTest:location withEvent:event];
if ([subview isKindOfClass:[UIButton class]])
{



 if(CGRectContainsPoint(eStringButton.frame, location)) {
     [eStringButton setHighlighted:YES];
 [eStringButton sendActionsForControlEvents:UIControlEventTouchDown];
 [NSTimer scheduledTimerWithTimeInterval:strumDelay target:self selector:@selector(ETimer) userInfo:nil repeats:NO];

    }

  else {

      [eStringButton setHighlighted:NO];


  }


  if(CGRectContainsPoint(ehStringButton.frame, location)) {
      [ehStringButton setHighlighted:YES];
      [ehStringButton sendActionsForControlEvents:UIControlEventTouchDown];

  }
  else {

      [ehStringButton setHighlighted:NO];

  }


if(CGRectContainsPoint(bStringButton.frame, location)) {
      [bStringButton setHighlighted:YES];
      [bStringButton sendActionsForControlEvents:UIControlEventTouchDown];

  }
else {

     [bStringButton setHighlighted:NO];


}

 if(CGRectContainsPoint(aStringButton.frame, location)) {
    [aStringButton sendActionsForControlEvents:UIControlEventTouchDown];
        [aStringButton setHighlighted:YES];

    }
else {

    [aStringButton setHighlighted:NO];


}


 if(CGRectContainsPoint(dStringButton.frame, location)) {
        [dStringButton setHighlighted:YES];

    [dStringButton sendActionsForControlEvents:UIControlEventTouchDown];

    }
else {
    [dStringButton setHighlighted:NO];



}
     if(CGRectContainsPoint(gStringButton.frame, location)) {
       [gStringButton setHighlighted:YES];
        [gStringButton sendActionsForControlEvents:UIControlEventTouchDown];
    }
    else {
        [gStringButton setHighlighted:NO];



    }




}       

}





- (void)dealloc {
[eStringButton release];
[aStringButton release];
[bStringButton release];
[gStringButton release];
[dStringButton release];
[ehStringButton release];



[super dealloc];
}



@end

The problem is that the view registers rapid fire "hits" even at normal strum speeds. How can I slow down the interface response? I cannot use any commands that pause the NSthread. Is there a way to disable the UIButton for a predetermined period of time after it receives the UIControlEventTouchDown message, say for 0.1 seconds? Should I create individual threads for each string and pause those threads? Right now it kind of works, but can easily turn into the "matrix" sounding stutter guitar. Not good.

Is there a way to disable the UIButton for a predetermined period of time after it receives the UIControlEventTouchDown message, say for 0.1 seconds?

Sure - you can use an NSTimer to change the button's .userInteractionEnabled property. Just set it to 'NO' as soon as you detect your touch down, and fire a timer to set it back to 'YES' after a set number/fractions of seconds.