I currently have a accelerometer action that displays a image but won't clear/reset - iphone

Question

For a exercise I created a project to experiment with the accelerometer functions of the iPhone. Right now when I run the app on my device it begins with a blank screen, shake the phone and a image is displayed.
I have to force close the app to clear the image. I was hoping someone could provide a solution that would make the image reset so I could repeat the process as many times as I wanted. (shake phone, display image, clear image) I'm thinking it needs a timer or something, not sure. Here is the source code. Thanks for taking the time to read and help.
// ViewController.m
// AccelTest
//
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
-(void)viewWillAppear:(BOOL)animated{
[self startAccel];
[self view];
}
-(void)viewWillDisappear:(BOOL)animated{
[self stopAccel];
[self view];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return NO;
}
-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{
double const kThreshold = 2.0;
// double const kThreshold = 2.0;
if ( fabsf(acceleration.x) > kThreshold
|| fabsf(acceleration.y) > kThreshold
|| fabsf(acceleration.z) > kThreshold){
[self.view addSubview:[[UIImageView alloc]initWithImage:[UIImage imageNamed:#"Icon.png"]]];
}
}
-(void)startAccel{
UIAccelerometer * accel = [UIAccelerometer sharedAccelerometer];
accel.delegate = self;
accel.updateInterval = .25;
}
-(void)stopAccel{
UIAccelerometer * accel = [UIAccelerometer sharedAccelerometer];
accel.delegate = nil;
}
#end

Answer 1

Here is how I would do it (without ARC) to tap the image to make it disappear.
Remove your line:
[self.view addSubview:[[UIImageView alloc]initWithImage:[UIImage imageNamed:#"Icon.png"]]];
And add these lines instead:
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Icon.png"]];
myImageView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapgr = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(rm:)];
[myImageView addGestureRecognizer:tapgr];
[tapgr release]; tapgr = nil;
[self.view addSubview:myImageView];
[myImageView release]; myImageView = nil;
Then add a method to the View Controller to remove the UIImageView when it is tapped.
-(void)rm:(UITapGestureRecognizer *)tapgr {
[tapgr.view removeFromSuperview];
}
When that Image is tapped once, the rm: method will be called which will remove the Image from self.view

Answer 2

Store a pointer to that image view somewhere and remove it from it's superview when you want to. Either with a timer, or user action, or something like that.