【方案一】- 自定義cell
** 圓角邊框為UIImage，充當(dāng)自定義cell的背景圖.**
方法比較簡單，就不粘代碼了帘不，弄上邊圓角，下邊圓角杨箭，沒有圓角寞焙，上下邊都有圓角四張圖片。
判斷加載的是section中的indexpath.row是幾，對應(yīng)加載哪種圓角圖片捣郊，就可以了辽狈，這種方法簡單，但是利用效率不高呛牲，代碼復(fù)用性也不高刮萌。

【方案二】- 給cell的contentView的layer加自定義邊框

//給cell的layer加邊框,這個是tableView的協(xié)議方法
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
    CAShapeLayer *layer = [[CAShapeLayer alloc] init];
    CGMutablePathRef pathRef = CGPathCreateMutable();

    CGRect bounds = cell.bounds;
    CGFloat cornerRadius = 10.f;

    if (indexPath.row == 0) {//第一個cell
        //上邊線
        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + 10, bounds.origin.y + 20);
        //畫弧
        CGPathAddArcToPoint(pathRef, nil, bounds.origin.x + 10, bounds.origin.y, bounds.origin.x + 30, bounds.origin.y, cornerRadius);
        //下面三句可以省略掉，寫了更容易理解
//        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + 20, bounds.origin.y);
//        CGPathAddLineToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 30, bounds.origin.y);
//        CGPathMoveToPoint(pathRef, nil,  bounds.origin.x + bounds.size.width - 30, bounds.origin.y);
        CGPathAddArcToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 10, bounds.origin.y, bounds.origin.x + bounds.size.width - 10, bounds.origin.y + 20, cornerRadius);
        
        //左邊線
        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + 10, bounds.origin.y + 20);
        CGPathAddLineToPoint(pathRef, nil, bounds.origin.x + 10, bounds.size.height);
        //右邊線
        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 10, bounds.origin.y + 10);
        CGPathAddLineToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 10, bounds.size.height);
           }
    if(indexPath.row == [tableView numberOfRowsInSection:indexPath.section] - 1){//最后一個cell
        //下邊線
        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + 10, bounds.origin.y + bounds.size.height);
        CGPathAddLineToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 10, bounds.origin.y + bounds.size.height);
        
        //左邊線
        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + 10, bounds.origin.y);
        CGPathAddLineToPoint(pathRef, nil, bounds.origin.x + 10, bounds.size.height);
        //右邊線
        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 10, bounds.origin.y);
        CGPathAddLineToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 10, bounds.size.height);
    }
    if (indexPath.row != 0 && indexPath.row != [tableView numberOfRowsInSection:indexPath.section] - 1) {//中間的cell
        //左邊線
        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + 10, bounds.origin.y);
        CGPathAddLineToPoint(pathRef, nil, bounds.origin.x + 10, bounds.size.height);
        //右邊線
        CGPathMoveToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 10, bounds.origin.y);
        CGPathAddLineToPoint(pathRef, nil, bounds.origin.x + bounds.size.width - 10, bounds.size.height);
    }
    layer.path = pathRef;
    CFRelease(pathRef);
    //顏色修改
    layer.fillColor = [UIColor whiteColor].CGColor;//這個是填充顏色娘扩，一個沒有封閉的線條着茸，無法做到完全填充
    layer.strokeColor=[UIColor redColor].CGColor;
    layer.borderWidth = 0.5;
    [cell.contentView.layer insertSublayer:layer atIndex:0];
}

上面的代碼寫的很靈活，都是加線等琐旁，可以按照項目具體需求具體更改涮阔，更改也比較方便
畫弧的CGPathAddArcToPoint這個方法請參考http://blog.csdn.net/u012160319/article/details/44835353

demo正在上傳中，demo地址 明天上傳