通过类别的方式来显示cell中的线条

设计师往往都会对UITableViewCell上面的线做文章，下面通过分类的方式快速显示。

@interface UIView (FMPCoomon)
- (void)showTopSeparateLine:(BOOL)bShow edgeInset:(UIEdgeInsets)separatorInset;
- (void)showBottomSeparateLine:(BOOL)bShow edgeInset:(UIEdgeInsets)separatorInset;
- (UIView*)getTopSeparateLine;
- (UIView*)getBottomSeparateLine;
@end

#define CELL_TOPLINE        112301
#define CELL_BOTLINE        112302

@implementation UIView (FMPCoomon)
- (UIView*)addTopLine:(UIEdgeInsets)separatorInset {
    UIView *line = [[UIView alloc] initWithFrame:CGRectMake(separatorInset.left, separatorInset.top, self.width - separatorInset.left - separatorInset.right, 0.5)];
    line.backgroundColor = [UIColor SCTableSeparateColor];
    line.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin;
    line.tag = CELL_TOPLINE;
    [self addSubview:line];
    return line;
}

- (UIView*)addBottomLine:(UIEdgeInsets)separatorInset {
    UIView *line = [[UIView alloc] initWithFrame:CGRectMake(separatorInset.left, self.height - .5 - separatorInset.bottom, self.width - separatorInset.left - separatorInset.right, 0.5)];
    line.backgroundColor = [UIColor SCTableSeparateColor];
    line.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
    line.tag = CELL_BOTLINE;
    [self addSubview:line];
    return line;
}

- (void)showTopSeparateLine:(BOOL)bShow edgeInset:(UIEdgeInsets)separatorInset {
    UIView *line = [self viewWithTag:CELL_TOPLINE];
    if (!line)
        line = [self addTopLine:separatorInset];
    else if (bShow)
        line.frame = CGRectMake(separatorInset.left, separatorInset.top, self.width - separatorInset.left - separatorInset.right, 0.5);
    
    line.hidden = !bShow;
}

- (void)showBottomSeparateLine:(BOOL)bShow edgeInset:(UIEdgeInsets)separatorInset {
    UIView *line = [self viewWithTag:CELL_BOTLINE];
    if (!line)
        line = [self addBottomLine:separatorInset];
    else if (bShow)
        line.frame = CGRectMake(separatorInset.left, self.height - .5 - separatorInset.bottom, self.width - separatorInset.left - separatorInset.right, 0.5);
    
    line.hidden = !bShow;
}

- (UIView*)getTopSeparateLine {
    UIView *line = [self viewWithTag:CELL_TOPLINE];
    if (!line)
        line = [self addTopLine:UIEdgeInsetsZero];
    return line;
}
- (UIView*)getBottomSeparateLine {
    UIView *line = [self viewWithTag:CELL_BOTLINE];
    if (!line)
        line = [self addBottomLine:UIEdgeInsetsZero];
    
    return line;
}
@end

具体使用：

[cell.contentView showTopSeparateLine:indexPath.row != 0 edgeInset:UIEdgeInsetsZero];

[self.headerView showTopSeparateLine:YES edgeInset:UIEdgeInsetsZero];
[self.headerView showBottomSeparateLine:YES edgeInset:UIEdgeInsetsZero];
self.tableView.tableHeaderView = self.headerView;

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *identifier = @"BillTableViewCell";
    BillTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    if (!cell) {
        cell = [BillTableViewCell loadFromXibWithIdentifier:identifier];
    }
    if (indexPath.row == ([tableView numberOfRowsInSection:indexPath.section] - 1)) {
        [cell showBottomSeparateLine:YES edgeInset:UIEdgeInsetsZero];
    } else if (indexPath.row == 0) {
        [cell showTopSeparateLine:YES edgeInset:UIEdgeInsetsZero];
        [cell showBottomSeparateLine:YES edgeInset:UIEdgeInsetsMake(0, 15, 0, 0)];
    } else {
        [cell showTopSeparateLine:NO edgeInset:UIEdgeInsetsZero];
        [cell showBottomSeparateLine:YES edgeInset:UIEdgeInsetsMake(0, 15, 0, 0)];
    }
    NSArray *dataArr = [self dataArrWith:tableView];
    NSArray *groupArr = dataArr[indexPath.section];
    BillInfoModel *info = groupArr[indexPath.row];
    [cell updateViewWithData:info];
    return cell;
}