分段 UITableView 在 accesoryview 中给出意外行为
我有一个包含三个部分的 UITableView。
- 第 1 部分有一个单元格,其附件视图中包含 UISwitch
failAtLaunch
。 - 第 2 部分包含failSounds 数组中的项目,并且对所选项目有一个单复选标记(在本例中为声音)
- 。第 3 部分包含一个按钮。
您可以在下面看到我如何配置单元格。
问题是该表给出了奇怪的行为。每当我上下滚动表格视图,并且单元格移入和移出视图时,第 2 部分中的某些单元格会在其附件视图中获得 UISwitch failAtLaunch
。
谁能帮我理解这是为什么?
提前致谢!
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//....blablabla...
// Configure the cell...
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *theSound = [prefs objectForKey:@"pickedFailSound"];
NSUInteger index = [failSounds indexOfObject:theSound];
if (indexPath.section == 0){
failAtLaunch = [[[UISwitch alloc] initWithFrame:CGRectMake(200, 7, 100, 30)] autorelease];
[cell addSubview:failAtLaunch];
cell.accessoryView = failAtLaunch;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if(![prefs boolForKey:@"failAtLaunch"]) {
[failAtLaunch setOn:NO animated:NO];
} else {
[failAtLaunch setOn:YES animated:NO];
}
[(UISwitch *)cell.accessoryView addTarget:self action:@selector(setIt) forControlEvents:UIControlEventValueChanged];
cell.textLabel.text = @"Instafail";
return cell;
} else if (indexPath.section == 1) {
NSString *cellTitle = [failSounds objectAtIndex:indexPath.row];
cell.textLabel.text = cellTitle;
if (indexPath.row == index) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
return cell;
} else {
cell = [tableView dequeueReusableCellWithIdentifier:@"buttonCell"];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"buttonCell"] autorelease];
}
cell.textLabel.text = @"Hold to record fail sound";
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(230.0f, 4.0f, 60.0f, 36.0f);
[btn setTitle:@"OK" forState:UIControlStateNormal];
[btn setTitle:@"OK" forState:UIControlStateSelected];
[btn addTarget:self action:@selector(recordAudio) forControlEvents:UIControlEventTouchDown];
[btn addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:btn];
return cell;
}
}
I've got a UITableView containing three sections.
- Section 1 has one cell containing a UISwitch
failAtLaunch
in its accesoryview - Section 2 contains the items from the failSounds array and has a singular checkmark for the selected item (sound in this case)
- Section 3 contains a button.
You can see below how I configure the cells..
The problem is that the table gives strange behaviour. Whenever I scroll up and down the tableview, with cells moving in and out of view, some cells in section 2 get the UISwitch failAtLaunch
in their accesoryview.
Can anyone help me understand why this is?
Thanks in advance!
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//....blablabla...
// Configure the cell...
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *theSound = [prefs objectForKey:@"pickedFailSound"];
NSUInteger index = [failSounds indexOfObject:theSound];
if (indexPath.section == 0){
failAtLaunch = [[[UISwitch alloc] initWithFrame:CGRectMake(200, 7, 100, 30)] autorelease];
[cell addSubview:failAtLaunch];
cell.accessoryView = failAtLaunch;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if(![prefs boolForKey:@"failAtLaunch"]) {
[failAtLaunch setOn:NO animated:NO];
} else {
[failAtLaunch setOn:YES animated:NO];
}
[(UISwitch *)cell.accessoryView addTarget:self action:@selector(setIt) forControlEvents:UIControlEventValueChanged];
cell.textLabel.text = @"Instafail";
return cell;
} else if (indexPath.section == 1) {
NSString *cellTitle = [failSounds objectAtIndex:indexPath.row];
cell.textLabel.text = cellTitle;
if (indexPath.row == index) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
return cell;
} else {
cell = [tableView dequeueReusableCellWithIdentifier:@"buttonCell"];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"buttonCell"] autorelease];
}
cell.textLabel.text = @"Hold to record fail sound";
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(230.0f, 4.0f, 60.0f, 36.0f);
[btn setTitle:@"OK" forState:UIControlStateNormal];
[btn setTitle:@"OK" forState:UIControlStateSelected];
[btn addTarget:self action:@selector(recordAudio) forControlEvents:UIControlEventTouchDown];
[btn addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:btn];
return cell;
}
}
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评论(2)
问题来自 dequeueReusableCellWithIdentifier:为每种类型的单元使用不同的静态字符串。
The problem is from the dequeueReusableCellWithIdentifier: use different static strings for each type of cell.
这是你的巴拉巴拉巴拉部分。我认为您可能对所有 3 种类型的行使用相同的重用标识符,并且在重用之前没有清除它们。
因此,当您实例化一个新的 tableViewCell 时,您需要打开部分并为每个部分指定一个唯一的标识符。
我通常做的是使用“CLEAR_ME_OUT”之类的标签来标记添加到单元格的每个视图,该标签被定义为一些大的任意数字。然后,当我重新使用单元格时,我会循环遍历子视图并从Superview 中删除带有该标签的所有单元格。这样就可以干净地重复使用。
It's your blah blah blah section. I think you are probably using the same reuse-identifier for all 3 types of rows, and not clearing them out prior to re-use.
So when you instantiate a new tableViewCell, you need to switch on section and give each one a unique identifier.
What I usually do is tag every view that I add to a cell with a tag like "CLEAR_ME_OUT" that is defined as some large arbitrary number. Then when I re-use a cell, I loop through the sub-views and removeFromSuperview all cells with that tag. That way it's nice a clean for re-use.