开发中有遇到要把长方形的cell改为圆角的，网上查了资料发现好多网友在如下方法中重绘cell。具体代码大家可以自行百度。

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{}

然后自己思考有没有别的方法可以实现。于是就尝试了一下。自己重写了如下方法。发现效果还不错。

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(nullable NSString *)reuseIdentifier{}

如图：

废话不多说直接上代码

.h中声明方法

#import <UIKit/UIKit.h>

@interface HanTableViewCell : UITableViewCell

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier cellForRowAtIndexPath:(NSIndexPath *)indexPath withTabel:(UITableView *)tableView;
@end

.m 中实现

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier cellForRowAtIndexPath:(NSIndexPath *)indexPath withTabel:(UITableView *)tableView
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        UIView *bgView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, tableView.frame.size.width, 44)];
        bgView.backgroundColor = [UIColor clearColor];
        [self.contentView addSubview:bgView];
        UIBezierPath *path = [UIBezierPath bezierPath];
        CAShapeLayer *maskLayer = [[CAShapeLayer alloc]init];
            maskLayer.frame = bgView.bounds;
            bgView.layer.mask = maskLayer;
            maskLayer.fillColor = [UIColor whiteColor].CGColor;
        if (indexPath.row == 0 && indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1)
        {
            path = [UIBezierPath bezierPathWithRoundedRect:bgView.bounds cornerRadius:22];
        }
        else if (indexPath.row == 0)
        {
            path = [UIBezierPath bezierPathWithRoundedRect:bgView.bounds byRoundingCorners:UIRectEdgeLeft|UIRectEdgeTop cornerRadii:CGSizeMake(22, 22)];
        }
        else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1)
        {
            path = [UIBezierPath bezierPathWithRoundedRect:bgView.bounds byRoundingCorners:UIRectEdgeRight|UIRectEdgeBottom cornerRadii:CGSizeMake(22, 22)];
        }
        else
        {
            path = [UIBezierPath bezierPathWithRect:bgView.bounds];
        }
        maskLayer.path = path.CGPath;
        [bgView.layer addSublayer:maskLayer];
        if (indexPath.row != [tableView numberOfRowsInSection:indexPath.section]-1  )
        {
            CALayer *lineLayer = [CALayer layer];
            lineLayer.borderWidth = 1;
            lineLayer.borderColor = tableView.separatorColor.CGColor;
            lineLayer.frame = CGRectMake(20, 43, tableView.frame.size.width - 40, 1);
            [bgView.layer addSublayer:lineLayer];
        }
    }
    return self;
}

具体使用：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellStr = @"cell";
    HanTableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    if (!cell)
    {
        cell = [[HanTableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:cellStr cellForRowAtIndexPath:indexPath withTabel:tableView];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        cell.accessoryType  = UITableViewCellAccessoryNone;
    }
    if (indexPath.row == 0)
    {
        cell.imageView.image = [UIImage imageNamed:@"l.jpeg"];
    }
    cell.textLabel.text = _dataArray[indexPath.section][indexPath.row];
    return cell;
}

重写的方法多传了两个参数：tableView、indexPath 用来区分自定义的cell。

注：由于自定义了cell的分割线，需要把自带的分割线去掉。

self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;

至此完工。