У меня есть подкласс UIButton под названием Checkbox, и я добавляю его в представление содержимого ячеек, когда вызывается метод cellForRowAtIndex.
У меня есть проблема.Кнопка добавляется в ячейку несколько раз.Как я могу предотвратить это?
Вот мой код:
RootViewController:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"CustomCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
UILabel *lab, *dlabl, *cornerLabel;
CheckBox *btn = (CheckBox *)[_checkboxArray objectAtIndex:indexPath.row];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
//I added this code:
cell.textLabel.font = [UIFont fontWithName:@"Helvetica" size:12.0];
cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
cell.textLabel.numberOfLines = 3; // 0 means no max.
UIImageView* img = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"gradient7.png"]] autorelease];
[cell setBackgroundView:img];
lab = [[[UILabel alloc] initWithFrame:CGRectMake(40, 18, cell.contentView.frame.size.width-15, 22)] autorelease];
[lab setBackgroundColor:[UIColor clearColor]];
[lab setTextColor:[UIColor whiteColor]];
[lab setAdjustsFontSizeToFitWidth:YES];
[lab setTextAlignment:UITextAlignmentLeft];
[lab setTag:kTEXT_LABEL_TAG];
[cell.contentView addSubview:lab];
dlabl = [[[UILabel alloc] initWithFrame:CGRectMake(5, 54, cell.contentView.frame.size.width- 1, 22)] autorelease];
[dlabl setTextColor:[UIColor colorWithRed:1.0 green:0.80 blue:0.0 alpha:1.0]];
[dlabl setBackgroundColor:[UIColor clearColor]];
// [dlabl setAdjustsFontSizeToFitWidth:YES];
[dlabl setTextAlignment:UITextAlignmentLeft];
[dlabl setTag:kDETAIL_TEXT_LABEL_TAG];
[dlabl setFont:[UIFont systemFontOfSize:[lab font].pointSize - 3]];
[cell.contentView addSubview:dlabl];
cornerLabel = [[[UILabel alloc] initWithFrame:CGRectMake(cell.contentView.frame.size.width - 40, 19, 40, 20)] autorelease];
[cornerLabel setTextColor:[UIColor whiteColor]];
//[cornerLabel setFont:[UIFont systemFontOfSize:12]];
[cornerLabel setAdjustsFontSizeToFitWidth:YES];
[cornerLabel setBackgroundColor:[UIColor clearColor]];
[cornerLabel setTextAlignment:UITextAlignmentCenter];
[cornerLabel setTag:kCORNER_TEXT_LABEL_TAG];
[cell.contentView addSubview:cornerLabel];
[cornerLabel setAdjustsFontSizeToFitWidth:YES];
}
else {
lab = (UILabel *)[[cell contentView] viewWithTag:kTEXT_LABEL_TAG];
dlabl = (UILabel *)[[cell contentView] viewWithTag:kDETAIL_TEXT_LABEL_TAG];
cornerLabel = (UILabel *)[[cell contentView] viewWithTag:kCORNER_TEXT_LABEL_TAG];
}
NSDictionary *dict = [_cellTextArray objectAtIndex:indexPath.row];
lab.text = [dict objectForKey:@"textLabel"];
dlabl.text = [dict objectForKey:@"detailTextLabel"];
cornerLabel.text = [dict objectForKey:@"cornerLabel"];
[cell.contentView addSubview:btn];
return cell;
}
CheckBox.m
- (void)checkImages {
NSUInteger tag = [self tag];
BOOL val = [[NSUserDefaults standardUserDefaults] boolForKey:[NSString stringWithFormat:@"%i", tag]];
if (val == YES) {
[self setImage:[UIImage imageNamed:@"checkbox-pressed.png"] forState:UIControlStateNormal];
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:[NSString stringWithFormat:@"%i", tag]];
}
else if (val == NO) {
[self setImage:[UIImage imageNamed:@"checkbox.png"] forState:UIControlStateNormal];
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:[NSString stringWithFormat:@"%i", tag]];
}
[[NSUserDefaults standardUserDefaults] synchronize];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if ([[[[event allTouches] anyObject] view] tag] == [self tag]) {
[self checkImages];
}
}