找了好长时间，没找到。废话少说，直接上代码。

效果图

// 重新绘制cell边框
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
    
    if ([cell respondsToSelector:@selector(tintColor)]) {
        
        // if (tableView == self.tableView) {
        
        CGFloat cornerRadius = 10.f;
        
        cell.backgroundColor = UIColor.clearColor;
        
        CAShapeLayer *layer = [[CAShapeLayer alloc] init];
        
        CGMutablePathRef pathRef = CGPathCreateMutable();
        
        CGRect bounds = CGRectInset(cell.bounds, 10, 0);
        
        BOOL addLine = NO;
        
        if (indexPath.row == 0 && indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
            
            CGPathAddRoundedRect(pathRef, nil, bounds, cornerRadius, cornerRadius);
            
        } else if (indexPath.row == 0) {
            
            CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
            
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
            
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
            
            CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds));
            
            addLine = YES;
            
        } else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
            
            CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds));
            
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);
            
            CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
            
            CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds));
            
        } else {
            
            CGPathAddRect(pathRef, nil, bounds);
            
            addLine = YES;
            
        }
        
        layer.path = pathRef;
        
        CFRelease(pathRef);
        
        //颜色修改
        
        layer.fillColor = [UIColor colorWithWhite:1.f alpha:0.5f].CGColor;
        
        layer.strokeColor=[UIColor whiteColor].CGColor;
        
        if (addLine == YES) {
            
            CALayer *lineLayer = [[CALayer alloc] init];
            
            CGFloat lineHeight = (1.f / [UIScreen mainScreen].scale);
            
            lineLayer.frame = CGRectMake(CGRectGetMinX(bounds)+10, bounds.size.height-lineHeight, bounds.size.width-10, lineHeight);
            
            lineLayer.backgroundColor = tableView.separatorColor.CGColor;
            
            [layer addSublayer:lineLayer];
            
        }
        
        UIView *testView = [[UIView alloc] initWithFrame:bounds];
        
        [testView.layer insertSublayer:layer atIndex:0];
        
        testView.backgroundColor = UIColor.clearColor;
        
        cell.backgroundView = testView;
        
    }
    
    // }
    
}