我正在尝试在表视图中实现多选。但它没有用。当我添加下面的代码时,它只显示表视图中元素的单个部分。当我从代码中删除此行时,我可以选择但不能取消选择项目。
删除了行代码:多项选择有效,但无法取消选择
for (i=0; i<[arr_selectedCells count]; i++) {
NSInteger currentValue = [(NSNumber *)[arr_selectedCells objectAtIndex:i] integerValue];
if (currentValue==indexPath.row) {
cell.accessoryType=UITableViewCellAccessoryCheckmark;
}
}
正确。
代码:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
UserFriend *user_friend=[arr_userFriends objectAtIndex:indexPath.row];
cell.textLabel.text=user_friend.name;
NSLog(@"name is %@",user_friend.name);
int i;
for (i=0; i<[arr_selectedCells count]; i++)
{
NSInteger currentValue = [(NSNumber *)[arr_selectedCells objectAtIndex:i]integerValue];
if(currentValue==indexPath.row)
{
cell.accessoryType=UITableViewCellAccessoryCheckmark;
}
else
{
cell.accessoryType=UITableViewCellAccessoryNone;
}
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if(![arr_userFriends containsObject:[NSNumber numberWithInteger:indexPath.row]])
{
[arr_selectedCells addObject:[NSNumber numberWithInteger:indexPath.row]];
}
else
{
[arr_selectedCells removeObject:[NSNumber numberWithInteger:indexPath.row]];
}
NSLog(@"numr is %ld",(long)indexPath.row);
[tableView reloadData];
}
请告诉我哪里出错了?
答案 0 :(得分:0)
我刚编辑了你的代码!我希望它对你有用
tableView CellForRowAtIndexPath
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
UserFriend *user_friend=[arr_userFriends objectAtIndex:indexPath.row];
cell.textLabel.text=user_friend.name;
if([arr_selectedCells containsObject:user_friend.name])
cell.accessoryType = UITableViewCellAccessoryCheckmark;
else
cell.accessoryType = UITableViewCellAccessoryNone;
return cell;
}
didSelectRowAtIndexPath方法
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UserFriend *user_friend=[arr_userFriends objectAtIndex:indexPath.row];
if([arr_selectedCells containsObject:user_friend.name])
{
[arr_selectedCells removeObject:user_friend.name];
}
else
{
[arr_selectedCells addObject:user_friend.name];
}
[tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
}
答案 1 :(得分:0)
试试这些
tableView.allowsSelection=YES;
tableView.allowsSelectionDuringEditing = YES;