Question

I’m trying to do a program that everytime my touches end, another UIView will appear using a loop for as many as UIView I want. How can I set a loop of UIView in my touches end? or should I create it in viewDidLoad and call it in touches end?

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event//upon leaving
    {
        UITouch *touch = [touches anyObject];

        for (int i=0; i < 100; i++) {
            UIImageView *layerView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
            [layerView setAlpha:.05];
            [self.view addSubview:layerView];
        }
    }

Hope you can help me guys..

Answer 1

If you want to add a single view after each tap, you don’t need a for loop. Just do

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event//upon leaving
{
    UITouch *touch = [touches anyObject];

    UIImageView *layerView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
    [layerView setAlpha:.05];

    // If you just want to add a line, add another uiview would the easiest way. For example:
    UIView *line = [UIView alloc] initWithFrame:CGRectMake(0, layerView.center.y, layerView.frame.size.width, 1)];
    line.backgroundColor = [UIColor blackColor];
    [layerView addSubview:line];

    [self.view addSubview:layerView];
}

Of course, you can also subclass a UIView and draw whatever you want in

- (void)drawRect:(CGRect)rect