主要方法重寫

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

高亮效果和使用系統(tǒng)顯示不佳逞带，只適合自定義Cell的情況

舉個栗子：

//
//  ViewController.m
//  TableViewGroup
//
//  Created by WeeverLu on 15/1/5.
//  Copyright (c) 2015年 WeeverLu. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UITableView *tableView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    self.tableView.tintColor = [UIColor redColor];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 4;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    switch (section) {
        case 0:
            return 1;
            break;
        case 1:
            return 2;
            break;
        case 2:
            return 3;
            break;
        case 3:
            return 4;
            break;
            
        default:
            break;
    }
    
    return 0;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    switch (section) {
        case 0:
            return @"單個Cell";
            break;
        case 1:
            return @"2個Cell";
            break;
        case 2:
            return @"3個Cell";
            break;
        case 3:
            return @"4個Cell";
            break;
            
        default:
            break;
    }
    
    return nil;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"CellIdentifier";
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:(UITableViewCellStyleDefault) reuseIdentifier:CellIdentifier];
    }
    if (indexPath.row == 0) {
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    else if (indexPath.row == 1) {
        cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
    }
    else if (indexPath.row == 2) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
    else if (indexPath.row == 3) {
        cell.accessoryType = UITableViewCellAccessoryDetailButton;
    }
    
    cell.textLabel.text = [NSString stringWithFormat:@"Section %ld, Row %ld", (long)indexPath.section, (long)indexPath.row];
    
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([cell respondsToSelector:@selector(tintColor)]) {
        CGFloat cornerRadius = 5.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);
        layer.fillColor = [UIColor colorWithWhite:1.f alpha:0.8f].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;
    }
}

@end