Question

I am trying to create a function that displays three buttons per row for thirty rows. My code correctly creates the buttons down the page, but I need them three across.

Here is my code:

for (NSInteger index = 0; index < 90; index++)
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake((scrollView.frame.size.width / 2.0f) - 50.0f, 10.0f + (50.0f * (CGFloat)index), 100.0f, 30.0f);
    button.tag = index;
    [button setTitle:[NSString stringWithFormat:@"Button %ld", ((long)index + 1)] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(didTapButton:) forControlEvents:UIControlEventTouchUpInside];

    [zoomView addSubview:button];
}

Answer 1

so, you can just use integer division and remainder on your index to adjust the frame:

for (NSInteger index = 0; index < 90; index++)
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake((scrollView.frame.size.width / 2.0f) - 170.0f+ (index % 3)*120.0f, 10.0f + (50.0f * (CGFloat)(index /3)), 100.0f, 30.0f);
    button.tag = index;
    [button setTitle:[NSString stringWithFormat:@"Button %ld", ((long)index + 1)] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(didTapButton:) forControlEvents:UIControlEventTouchUpInside];

    [zoomView addSubview:button];
}