单选：
@interface dataModel : NSObject @property (nonatomic, copy) NSString *title; @property (nonatomic, assign,getter=isSelected) BOOL selected; @end @implementation dataModel @end @interface customTableviewCell : UITableViewCell @property (nonatomic, strong) UIButton *customAccess; @end @implementation customTableviewCell - (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) { _customAccess = [[UIButton alloc] init]; _customAccess.contentMode = UIViewContentModeCenter; _customAccess.userInteractionEnabled = NO; [_customAccess setBackgroundImage:[UIImage imageNamed:@"no_selected"] forState:UIControlStateNormal]; [_customAccess setBackgroundImage:[UIImage imageNamed:@"selected"] forState:UIControlStateSelected]; [_customAccess sizeToFit]; self.accessoryView = _customAccess; self.selectionStyle = UITableViewCellSelectionStyleNone; } return self; } @end @interface ViewController ()<UITableViewDataSource, UITableViewDelegate> @property (nonatomic, strong) UITableView *tableview; @property (nonatomic, strong) NSMutableArray *datasArray; //最后一次选中的行 @property (nonatomic, assign)NSInteger lastIndexRow; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.view.backgroundColor = [UIColor whiteColor]; [self.view addSubview:self.tableview]; } - (NSMutableArray *)datasArray { if (!_datasArray) { _datasArray = [NSMutableArray array]; for (int i = 0; i < 100; i ++) { dataModel *model = [[dataModel alloc] init]; model.title = [NSString stringWithFormat:@"%d",i]; if (i == 0) { model.selected = YES; _lastIndexRow = i; } [_datasArray addObject:model]; } } return _datasArray; } - (UITableView *)tableview { if (!_tableview) { _tableview = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width,self.view.bounds.size.height) style:UITableViewStyleGrouped]; _tableview.dataSource = self; _tableview.delegate = self; } return _tableview; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView; { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return self.datasArray.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *reusedCellId = @"CellId"; customTableviewCell *cell = [self.tableview dequeueReusableCellWithIdentifier:reusedCellId]; if (!cell) { cell = [[customTableviewCell alloc] initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:reusedCellId]; } dataModel *model = self.datasArray[indexPath.row]; cell.textLabel.text = model.title; cell.customAccess.selected = model.isSelected; return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [tableView deselectRowAtIndexPath:indexPath animated:NO]; NSInteger newRow = indexPath.row; dataModel *model = self.datasArray[newRow]; if (model.isSelected) { //已经选中了。就直接返回。 return; } //是新的选中行。取消上一次的选中行 //更新老的数据源 dataModel *oldModel = self.datasArray[_lastIndexRow]; oldModel.selected = !oldModel.isSelected; NSIndexPath * indexP = [NSIndexPath indexPathForRow:_lastIndexRow inSection:0]; customTableviewCell *oldCell = [self.tableview cellForRowAtIndexPath:indexP]; oldCell.customAccess.selected = oldModel.selected; //更新新的选中行 model.selected = !model.isSelected; _lastIndexRow = newRow; customTableviewCell *newCell = [tableView cellForRowAtIndexPath: indexPath]; newCell.customAccess.selected = model.isSelected; } - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 45.0; } - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section { return 20.0; }当用系统的accessoryType的时候。可以不需要model中的选中状态。直接用下面的代码替换。道理类似。
if (newCell.accessoryType == UITableViewCellAccessoryCheckmark) {//当已经是选中状态时候直接返回。 return; } 多选：更简单。不需要lastselectindex属性。因为不需要改名oldcell的状态。直接把newcell的状态取反即可。
