如何解决UIButton多次添加到tableView
| 我有一个名为Checkbox的UIButton子类,并在调用cellForRowAtIndex方法时将其添加到单元格内容视图中。 我有一个问题。该按钮被添加到单元格几次。我该如何预防? 这是我的代码: 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];
}
}
解决方法
仅在创建单元时,即在使可重复使用的单元出队失败时,才添加按钮。
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