基本上触摸屏图像应该出现在触摸但不起作用的地方。
-(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)];
}