A custom CollectionView for Mac OSX like UICollectionView in iOS.

Podfile

To integrate LZCollectionView into your Xcode project using CocoaPods, specify it in your Podfile:

pod 'LZCollectionView', '~> 0.1'

Then, run the following command:

$ pod install

Usage

1.init

- (void)createData
{
    NSImage *image1 = [NSImage imageNamed:@"001"];
    NSImage *image2 = [NSImage imageNamed:@"002"];
    NSImage *image3 = [NSImage imageNamed:@"003"];
    NSImage *image4 = [NSImage imageNamed:@"004"];
    NSImage *image5 = [NSImage imageNamed:@"005"];

    for (int i = 0; i < 200; i++) {
        [_items1 addObject:[NSDictionary dictionaryWithObjectsAndKeys:
                            image1, kContentImageKey,
                            NSImageNameComputer, kContentTitleKey,
                            nil]];
        [_items2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:
                            image2, kContentImageKey,
                            NSImageNameNetwork, kContentTitleKey,
                            nil]];
        [_items2 addObject:[NSDictionary dictionaryWithObjectsAndKeys:
                            image3, kContentImageKey,
                            NSImageNameDotMac, kContentTitleKey,
                            nil]];
        [_items3 addObject:[NSDictionary dictionaryWithObjectsAndKeys:
                            image4, kContentImageKey,
                            NSImageNameFolderSmart, kContentTitleKey,
                            nil]];
        [_items3 addObject:[NSDictionary dictionaryWithObjectsAndKeys:
                            image5, kContentImageKey,
                            NSImageNameBonjour, kContentTitleKey,
                            nil]];
    }

    [_sections addObject:_items1];
    [_sections addObject:_items2];
    [_sections addObject:_items3];

    image1 = nil;
    image2 = nil;
    image3 = nil;
    image4 = nil;
    image5 = nil;
}

2.reloadData

- (void)awakeFromNib
{
    [self createData];

    [_collectionView registerClass:[MyCollectionViewCell class] forCellWithReuseIdentifier:@"CellIdentifier"];
    [_collectionView registerClass:[MyCollectionSupplementaryView class]
        forSupplementaryViewOfKind:LZCollectionElementKindSectionHeader
               withReuseIdentifier:@"SupplementaryViewIdentifier"];
    [_collectionView registerClass:[MyCollectionSupplementaryView class]
        forSupplementaryViewOfKind:LZCollectionElementKindSectionFooter
               withReuseIdentifier:@"SupplementaryViewIdentifier"];

    [_collectionView setBackgroundColor:[NSColor lightGrayColor]];
    [_collectionView setAllowsMultipleSelection:YES];
    [_collectionView setAllowsMultipleSelectionWithDrag:YES];


    [_collectionView setDelegate:self];
    [_collectionView setDataSource:self];

    //layout
    [_gridLayout setSectionInset:LZEdgeInsetsMake(10.0, 10.0, 10.0, 10.0)];
    [_flowLayout setSectionInset:LZEdgeInsetsMake(10.0, 10.0, 10.0, 10.0)];
    [_collectionView setCollectionViewLayout:_flowLayout];

    [_collectionView reloadData];
}

3.DataSource and Delegate

- (NSInteger)collectionView:(LZCollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return [[_sections objectAtIndex:section] count];
}


- (LZCollectionViewCell *)collectionView:(LZCollectionView *)collectionView
                  cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    MyCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CellIdentifier"
                                                                           forIndexPath:indexPath];

    NSInteger section = indexPath.section;
    NSImage *image = [[[_sections objectAtIndex:section] objectAtIndex:indexPath.item] objectForKey:kContentImageKey];
    NSString *title = [[[_sections objectAtIndex:section] objectAtIndex:indexPath.item] objectForKey:kContentTitleKey];

    cell.image = image;
    cell.text = title;

    cell.backgroundColor = [NSColor lightGrayColor];

    cell.highlightedColor = [NSColor blueColor];

    [cell setSelectable:YES];
    [cell setSelectedColor:[NSColor greenColor]];

    [cell setItemBorderRadius:10.0];
    [cell setSelectionRingColor:[NSColor redColor]];
    [cell setSelectionRingLineWidth:2];

    return cell;
}

- (NSInteger)numberOfSectionsInCollectionView:(LZCollectionView *)collectionView
{
    return [_sections count];
}

- (LZCollectionReusableView *)collectionView:(LZCollectionView *)collectionView
           viewForSupplementaryElementOfKind:(NSString *)kind
                                 atIndexPath:(NSIndexPath *)indexPath
{
    MyCollectionSupplementaryView *view = [collectionView dequeueReusableSupplementaryViewOfKind:kind
                                                                             withReuseIdentifier:@"SupplementaryViewIdentifier"
                                                                                    forIndexPath:indexPath];
    view.image = [NSImage imageNamed:@"001"];
    view.text = [NSString stringWithFormat:@"%ld-%ld",indexPath.section,indexPath.item];

    return view;
}

- (void)collectionView:(LZCollectionView *)collectionView
       willDisplayCell:(LZCollectionViewCell *)cell
    forItemAtIndexPath:(NSIndexPath *)indexPath
{

}
- (void)collectionView:(LZCollectionView *)collectionView
willDisplaySupplementaryView:(LZCollectionReusableView *)view
        forElementKind:(NSString *)elementKind
           atIndexPath:(NSIndexPath *)indexPath
{

}

- (NSSize)collectionView:(LZCollectionView *)collectionView
                  layout:(LZCollectionViewLayout *)collectionViewLayout
  sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger section = indexPath.section;
    NSInteger item = indexPath.item;
    if (section == 0 && item % 2 == 0) {
        return NSMakeSize(100, 100);
    }
    else if (section == 1 && item % 2 == 0) {
        return NSMakeSize(120, 120);
    }
    else if (section == 2 && item % 2 == 0) {
        return NSMakeSize(150, 150);
    }

    return NSMakeSize(300, 300);
}

- (NSSize)collectionView:(LZCollectionView *)collectionView
                  layout:(LZCollectionViewLayout *)collectionViewLayout
referenceSizeForHeaderInSection:(NSInteger)section
{
    return NSMakeSize([_collectionView visibleRect].size.width, 30);
}

- (NSSize)collectionView:(LZCollectionView *)collectionView
                  layout:(LZCollectionViewLayout *)collectionViewLayout
referenceSizeForFooterInSection:(NSInteger)section
{
    return NSMakeSize([_collectionView visibleRect].size.width, 30);
}

License

LZCollectionView is released under the MIT license. See LICENSE for details.