UICollectionView 使用

/**
初始化UICollectionView
*/
UICollectionViewFlowLayout *flowLayout=[[UICollectionViewFlowLayout alloc] init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
flowLayout.minimumLineSpacing = 0;
flowLayout.minimumInteritemSpacing=0;

_deviceCollectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth, kHeightPro(622)*2) collectionViewLayout:flowLayout];

//设置代理
_deviceCollectionView.delegate = self;
_deviceCollectionView.dataSource = self;
[self.view addSubview:_deviceCollectionView];
[_deviceCollectionView setBackgroundColor:RGBColor(0xf3, 0xf6, 0xf8)];

// Register cell classes
[_deviceCollectionView registerClass:[AnbotDeviceCollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];

#pragma mark －－ <UICollectionViewDataSource>

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 2;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return 2;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

AnbotDeviceCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier  forIndexPath:indexPath];
[cell sizeToFit];
if (!cell) {
NSLog(@"无法创建CollectionViewCell时打印，自定义的cell就不可能进来了。");
}
[self configureCell:cell atIndexPath:indexPath];

return cell;
}

- (void)configureCell:(AnbotDeviceCollectionViewCell *)cell atIndexPath:(NSIndexPath*)indexPath
{

int index =  indexPath.row *2+ indexPath.section;
cell.section = indexPath.section;
[cell setEnableImage:UIResourceBundleSubDevice(imageOpenArr[index])];
[cell setDisableImage:UIResourceBundleSubDevice(imageCloseArr[index])];
// [cell  setImage:UIResourceBundleSubDevice(imageOpenArr[index])];

[cell setNameText:titleArr[index]];

[cell setDeviceNum:[devCountArr[index]integerValue]];
[cell setNeedsUpdateConstraints];
[cell updateConstraintsIfNeeded];
}

-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(0, 0, 0, 0);
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{

return CGSizeMake(kScreenWidth/2, collectionView.frame.size.height/2);
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
// NSLog(@"cell #%d was selected  %d", indexPath.row,indexPath.section);

int index =  indexPath.row *2+ indexPath.section;
if ([devCountArr[index] integerValue]==0) {
return;
}

NSPredicate *predicate = [NSPredicate predicateWithFormat:@" deviceType == %d ",index];
NSMutableArray *tempArray = [NSMutableArray arrayWithArray:deviceArr];
[tempArray filterUsingPredicate:predicate];
AnbotSingleDeviceManagerVC *singleVC = [[AnbotSingleDeviceManagerVC alloc]init];
singleVC.index = index; //indexPath.row *2+ indexPath.section;
singleVC.singleDevArr = tempArray;
// singleVC.devInfo = deviceArr[index];
[self.navigationController pushViewController:singleVC animated:YES];

}