1.删除和插入单元格
表格一旦进入删除或插入状态，单元格的左边就会出现一个“编辑控件”，这个区域会显示删除控件或插入控件，具体显示那个图标在表视图委托协议的tableView:editingStyleForRowAtIndexPath:方法中设定。
为了防止用户操作失误，删除过程需要确认。删除是点击Delete按钮，才会成功删除
删除和插入单元格操作的核心是如下两个方法：表视图委托对象的tableView:editingStyleForRowAtIndexPath:方法和表视图数据源对象的tableView:commitEditingStyle:forRowAtIndexPath:方法
setEditing:animated:方法设定视图能否进入编辑状态，然后调用委托协议中的tableView:editingStyleForRowAtIndexPath:方法进行单元格编辑图标的设置，当用户删除或修改控件时，委托方法向数据源发出tableView:commitEditingStyle:forRowAtIndexPath:消息实现删除或插入的处理
@property (strong, nonatomic) IBOutlet UINavigationItem *navigatItem;
@property (strong, nonatomic) IBOutlet UITextField *txtField;
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (nonatomic,strong) NSMutableArray *listeams;
- (void)viewDidLoad {
[super viewDidLoad];
self.navigatItem .rightBarButtonItem = self.editButtonItem;
self.navigatItem.title = @"单元格插入和删除";
self.txtField.hidden = YES;
self.txtField.delegate = self;
self.tableView.delegate = self ;
self.tableView.dataSource = self;
self.listeams = [[NSMutableArray alloc]initWithObjects:@"黑龙江",@"吉林", @"辽宁",nil];
}
-(void)setEditing:(BOOL)editing animated:(BOOL)animated
{
[super setEditing:editing animated:animated];
if (editing) {
self.txtField.hidden = NO;
}else{
self.txtField.hidden = YES;
}
[self.tableView setEditing:editing animated:animated];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [self.listeams count]+1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIndentifier = @"Cell";
BOOL b_addCell = (indexPath.row == self.listeams.count);
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIndentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIndentifier];
}
if (!b_addCell) {
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.textLabel.text = [self.listeams objectAtIndex:indexPath.row];
}else{
self.txtField.frame = CGRectMake(10, 0, 300, 44);
self.txtField.text = @"";
[cell.contentView addSubview:self.txtField];
}
return cell ;
}
-(BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
[self.listeams removeObjectAtIndex:indexPath.row];
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView reloadData];
}else{
[self.listeams insertObject:self.txtField.text atIndex:[self.listeams count]];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView reloadData];
}
}
#pragma mark - UITableViewDelegate
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row == self.listeams.count) {
return UITableViewCellEditingStyleInsert;
}else{
return UITableViewCellEditingStyleDelete;
}
}
- (BOOL)tableView:(UITableView *)tableView shouldHighlightRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row == [self.listeams count]) {
return NO;
}else{
return YES;
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 50;
}
#pragma mark - UITextFieldDelegate
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
UITableViewCell *cell = (UITableViewCell*)[[textField superview]superview];
[self.tableView setContentOffset:CGPointMake(0.0, cell.frame.origin.y) animated:YES];
return YES;
}
移动单元格
移动单元格时，需要实现数据源的tableView: canMoveRowAtIndexPath:和tableView: moveRowAtIndexPath: toIndexPath:方法
-(BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath{
return YES;
}
-(void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath{
NSString *stringToMove = [self.listeams objectAtIndex:sourceIndexPath.row];
[self.listeams removeObjectAtIndex:sourceIndexPath.row];
[self.listeams insertObject:stringToMove atIndex:destinationIndexPath.row];
[self.tableView reloadData];
}
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
return UITableViewCellEditingStyleNone;
}