Every new touch creates a new object that animates across the screen.

C4Workspace.m

//
//  C4WorkSpace.m
//  Touch2Animation
//
//  Created by Adam Tindale on 2013-06-01.
//

#import "C4WorkSpace.h"

@implementation C4WorkSpace

-(void)setup{}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    C4Shape * an = [C4Shape rect:CGRectMake(-40, 10, 30, 30)];
    [an setCenter:CGPointMake(-40, 30)];
    [self.canvas addShape:an];

    an.animationDuration = 1.0f;
    [an setCenter:CGPointMake(self.canvas.width + 40, 30)];
    [an runMethod:@"removeFromSuperview" afterDelay:an.animationDuration+.01f];
}

@end