////  RootViewController.m//  ChangeCell////  Copyright (c) 2014年 Y.X. All rights reserved.//#import "RootViewController.h"#import "YellowCell.h"#import "RedCell.h"#import "TitleCell.h"// ------------------------------static NSString *CELL[] = {    @"TitleCellFlag",    @"RedCellFlag",    @"YellowCellFlag",};typedef enum : NSUInteger {    Title,    Red,    Yellow,} CellType;// ------------------------------@interface RootViewController ()<UITableViewDataSource, UITableViewDelegate>@property (nonatomic, strong) UITableView  *tableView;@property (nonatomic, strong) NSString     *changeFlag;  // 切换标签@property (nonatomic, strong) NSArray      *dataArray;   // 数据源@property (nonatomic, strong) NSArray      *redData;     // 红色cell数据@property (nonatomic, strong) NSArray      *yellowData;  // 黄色cell数据@end@implementation RootViewController- (void)viewDidLoad{    [super viewDidLoad];        // 初始化TableView    _tableView = [[UITableView alloc] initWithFrame:self.view.bounds                                              style:UITableViewStylePlain];    _tableView.delegate   = self;    _tableView.dataSource = self;    [self.view addSubview:_tableView];        // 红色cell数据    _redData    = http://www.mamicode.com/@[@"", @"", @"", @""];        // 黄色cell数据    _yellowData = http://www.mamicode.com/@[@"", @"", @"", @"", @"", @"", @""];                // 数据源    _dataArray = _redData;        // 类型    _changeFlag = CELL[Red];        // 4秒钟之后切换cell    [self performSelector:@selector(runSelector:)               withObject:nil               afterDelay:9];}- (void)runSelector:(id)sender{    // 数据源    _dataArray = _yellowData;        // 类型    _changeFlag = CELL[Yellow];        // 重新加载数据    [_tableView reloadData];}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return [_dataArray count];}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    UITableViewCell *cell = nil;    if (indexPath.row == 0) // 第一格cell    {        cell = [[TitleCell alloc] initWithStyle:UITableViewCellStyleDefault                                reuseIdentifier:CELL[Title]];        cell.textLabel.font      = [UIFont fontWithName:@"HelveticaNeue-Thin" size:18];        cell.textLabel.text      = @"YouXianMing";        cell.textLabel.textColor = [UIColor redColor];        cell.selectionStyle      = UITableViewCellSelectionStyleNone;    }        if (indexPath.row != 0) // 其他cell    {        if ([_changeFlag isEqualToString:CELL[Red]])        {            cell = [[RedCell alloc] initWithStyle:UITableViewCellStyleDefault                                  reuseIdentifier:CELL[Title]];            cell.backgroundColor = [UIColor redColor];   // 红色            cell.selectionStyle  = UITableViewCellSelectionStyleNone;        }                if ([_changeFlag isEqualToString:CELL[Yellow]])        {            cell = [[YellowCell alloc] initWithStyle:UITableViewCellStyleDefault                                     reuseIdentifier:CELL[Title]];            cell.backgroundColor = [UIColor yellowColor]; // 黄色            cell.selectionStyle  = UITableViewCellSelectionStyleNone;        }    }        return cell;}- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    if (indexPath.row == 0)    {        return 70;    }        if ([_changeFlag isEqualToString:CELL[Red]])    {        return 100;    }        if ([_changeFlag isEqualToString:CELL[Yellow]])    {        return 200;    }        return 0;}@end