先上效果圖:

image.png

因?yàn)橛械膕ection里面有HeaderView有的沒有HeaderView,所以切圖角的時(shí)候需要判斷這種情況.
圓角直接用的layer的mask實(shí)現(xiàn)
OK,直接上代碼吧:

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    //圓率
    CGFloat cornerRadius = 8;
    //大小
    CGRect bounds = cell.bounds;
    //行數(shù)
    NSInteger numberOfRows = [tableView numberOfRowsInSection:indexPath.section];
    UIView *headerView;
    if ([self respondsToSelector:@selector(tableView:viewForHeaderInSection:)]) {
        headerView=[self tableView:tableView viewForHeaderInSection:indexPath.section];
    }
    
    //繪制曲線
    UIBezierPath *bezierPath = nil;
    if (headerView) {
        if (indexPath.row == 0 && numberOfRows == 1) {
            //一個(gè)為一組時(shí)，四個(gè)角都為圓角
            bezierPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:(UIRectCornerBottomLeft|UIRectCornerBottomRight) cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
        }else
        if (indexPath.row == numberOfRows - 1) {
            //為組的最后一行，左下、右下角為圓角
            bezierPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:(UIRectCornerBottomLeft|UIRectCornerBottomRight) cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
        } else {
            //中間的都為矩形
            bezierPath = [UIBezierPath bezierPathWithRect:bounds];
        }
    }else{
        if (indexPath.row == 0 && numberOfRows == 1) {
            //一個(gè)為一組時(shí)，四個(gè)角都為圓角
            bezierPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
        } else if (indexPath.row == 0) {
            //為組的第一行時(shí)，左上、右上角為圓角
            bezierPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight) cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
        } else if (indexPath.row == numberOfRows - 1) {
            //為組的最后一行，左下、右下角為圓角
            bezierPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:(UIRectCornerBottomLeft|UIRectCornerBottomRight) cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
        } else {
            //中間的都為矩形
            bezierPath = [UIBezierPath bezierPathWithRect:bounds];
        }
    }
    
    //新建一個(gè)圖層
    CAShapeLayer *layer = [CAShapeLayer layer];
    //圖層邊框路徑
    layer.path = bezierPath.CGPath;
    cell.layer.mask=layer;
}

- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section {
    //圓率
    CGFloat cornerRadius = 8;
    //大小
    CGRect bounds = view.bounds;
    
    //繪制曲線
    UIBezierPath *bezierPath = nil;
    //為組的第一行時(shí)，左上、右上角為圓角
    bezierPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight) cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
    //新建一個(gè)圖層
    CAShapeLayer *layer = [CAShapeLayer layer];
    //圖層邊框路徑
    layer.path = bezierPath.CGPath;
    view.layer.mask=layer;
}