围绕UITableView的一部分阴影

Question

I have a UITableView with 4 sections. Now I want to add a shadow effect to a particular section of table but not the full table. How can I achieve this task?

Answer 1

You will have to alter the sections header and footer as well as all cells of the section.

Use tableView:viewForFooterInSection: , tableView:viewForHeaderInSection: and tableView:cellForRowAtIndexPath: for that. Just add a UIView with rgba 0/0/0/0.2 or similar to each view you want to be dark.

Answer 2

You can add image with shadow as background of UITableViewCell. Shadow should be drawn in the image. It is very simple and your application will run faster.

Answer 3

You can specify the shadow for the the section you want. Here is a sample.

First of all we are making some space available for your header

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    if(section == mysection)
    {
        // Returns the height you want for the header section. I am giving 20
        return 20; 
    }
}

Then the decoration of the header

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    if(section == mysection)
    {
        UIView *shadowView  =  [[[UIView alloc] initWithFrame: CGRectMake(0,0,320,20)] autorelease];
        shadowView.backgroundColor = [UIColor whiteColor];

        // Doing the Decoration Part
        shadowView.layer.shadowColor = [[UIColor blackColor] CGColor];
        shadowView.layer.shadowOffset = CGSizeMake(1.0f, 1.0f);
        shadowView.layer.shadowRadius = 3.0f;
        shadowView.layer.shadowOpacity = 1.0f;

        return shadowView;
    }
    return nil;
}

Complete it on your side. This one is a basic outline. Happy Coding :)

Answer 4

Try this

yourView.layer.shadowColor = [[UIColor blackColor] CGColor];
yourView.layer.shadowOffset = CGSizeMake(1.0f, 1.0f);
yourView.layer.shadowRadius = 3.0f;
yourView.layer.shadowOpacity = 1.0f; 

You'll need to replace "yourView" with anything else

don't forget also you'll need import QuartzCore/CALayer.h