iOS不自訂UICollectionViewCell直接在代理方法實現

眾所周知，collectionView在資料來源方法中，需要加入自訂的cell，有時候一個簡單的cell，只需要很簡單的UI，這時候自訂，就顯得多此一舉，在此，推薦一種自訂方法。可以解決重用問題，還能快速建立。

UICollectionView 和 UICollectionViewController 類是iOS6 新引進的API，用於展示集合視圖，布局更加靈活，可實現多欄版面配置，用法類似於UITableView 和 UITableViewController 類。

使用UICollectionView 必須實現UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout這三個協議

代碼如下

複製代碼

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {     if (style ==1) {         KeepCarBrandCollectionViewCell *cell = (KeepCarBrandCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"KeepCarBrandCollectionViewCell" forIndexPath:indexPath];         [cell setBackgroundColor:kYellowColor];         NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@",kImageBaseURL,_imageArray[indexPath.row]]];           [cell.iconImageView setImageWithURL:url placeholderImage:[UIImage imageNamed:@"pic_common_carlogo_loading"]];         NSLog(@"%@",url);         [cell.iconImageView setContentMode:UIViewContentModeScaleAspectFit];         [cell.brandNameLabel setText:_titleArray[indexPath.row]];         return cell;     }else if (style == 2)     {         UICollectionViewCell *cell = (UICollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"CarTypeCell" forIndexPath:indexPath];         if (cell) {             [cell.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];         }         //邊框view         UIView *borderView = [[UIView alloc] initWithFrame:CGRectMake(5, 5, cell.width-10, cell.height-10)];         [borderView setBorder:1 color:kLineColor];         [cell addSubview:borderView];         //內容label         UILabel *contentLabel = [[UILabel alloc] initWithFrame:borderView.frame];         contentLabel.font = FONT(16);         if (_headerArray[indexPath.section]) {              contentLabel.text = [[_contentDic objectForKey:[_headerArray[indexPath.section] objectForKey:@"id"]][indexPath.row] objectForKey:@"name"];         }         contentLabel.textAlignment = NSTextAlignmentCenter;         [cell addSubview:contentLabel];         return cell;     }else if (style ==3)     {        UICollectionViewCell *cell = (UICollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"OutPutCell" forIndexPath:indexPath];         if (cell) {             [cell.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];         }         //邊框view         UIView *borderView = [[UIView alloc] initWithFrame:CGRectMake(5, 5, cell.width-10, cell.height-10)];         [borderView setBorder:1 color:kLineColor];         [cell addSubview:borderView];         //內容label         UILabel *contentLabel = [[UILabel alloc] initWithFrame:borderView.frame];         contentLabel.font = FONT(16);         contentLabel.text = _contentArray[indexPath.row];         contentLabel.textAlignment = NSTextAlignmentCenter;         [cell addSubview:contentLabel];         return cell;     }     return nil; }

紅色高亮地區，便是代理方法裡面的具體實現，其實就是在載入cell的時候，將他的所有子空間全部移除，以免其複用的時候，出現重複的子空間。