基本的に、タッチスクリーン画像はタッチした場所に表示されますが、機能しません。
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
UIImage *image = [[UIImage alloc]initWithContentsOfFile:@"BluePin.png"];
[image drawAtPoint:CGPointMake(location.x, location.y)];
}