我的 tableView 有一个带有分段控件的标题。段 0 将显示我的 tableView 3 行和段 1 将显示它 4 行。
在每个单元格中，我都添加了一个 textField 子视图。因此，在第 0 段，我将有三行包含邮政编码、半径和 API 密钥。对于第 1 段，我将有四行包含纬度、经度、半径和 API 密钥。但是，当我来回切换时，没有正确删除 textField 子视图。（Radius 和 API Key 字段是相同的字段，但切换时它们会显示在不同的行上。）
我曾尝试标记 textFields，然后使用该标记删除 textField，但这是不稳定的。我已经测试了 textField 是否存在，如果存在，请在切换时将其删除。（这在下面的示例代码中。）我也尝试过使用 segmentChanged 方法无济于事。
请查看我的代码，我将不胜感激任何指针，因为我不确定在哪里以及如何最好地删除这些子视图。
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if ([mySegmentControl selectedSegmentIndex] == 0) {
return 3;
} else {
return 4;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
if ([mySegmentControl selectedSegmentIndex] == 0) {
if (latField) {
[latField removeFromSuperview];
[longField removeFromSuperview];
[radiusField removeFromSuperview];
[apiKeyField removeFromSuperview];
}
if ([indexPath row] == 0 && [indexPath section] == 0) {
zipCodeField = [[UITextField alloc] initWithFrame:CGRectMake(135, 10, 145, 30)];
[[cell textLabel] setText:@"Zip Code:"];
[cell.contentView addSubview:zipCodeField];
} else if ([indexPath row] == 1 && [indexPath section] == 0) {
radiusField = [[UITextField alloc] initWithFrame:CGRectMake(135, 10, 145, 30)];
[[cell textLabel] setText:@"Radius:"];
[cell.contentView addSubview:radiusField];
} else if ([indexPath row] ==2 && [indexPath section] == 0) {
apiKeyField = [[UITextField alloc] initWithFrame:CGRectMake(110, 10, 145, 30)];
[[cell textLabel] setText:@"API Key:"];
[cell.contentView addSubview:apiKeyField];
}
else if ([mySegmentControl selectedSegmentIndex] == 1) {
if (zipCodeField) {
[zipCodeField removeFromSuperview];
[radiusField removeFromSuperview];
[apiKeyField removeFromSuperview];
}
if ([indexPath row] == 0 && [indexPath section] == 0) {
latField = [[UITextField alloc] initWithFrame:CGRectMake(135, 10, 145, 30)];
[[cell textLabel] setText:@"Latitude:"];
[cell.contentView addSubview:latField];
} else if ([indexPath row] ==1 && [indexPath section] == 0) {
longField = [[UITextField alloc] initWithFrame:CGRectMake(135, 10, 145, 30)];
[[cell textLabel] setText:@"Longitude:"];
[cell.contentView addSubview:longField];
} else if ([indexPath row] ==2 && [indexPath section] == 0) {
radiusField = [[UITextField alloc] initWithFrame:CGRectMake(135, 10, 145, 30)];
[[cell textLabel] setText:@"Radius:"];
[cell.contentView addSubview:radiusField];
} else if ([indexPath row] == 3 && [indexPath section] == 0) {
apiKeyField = [[UITextField alloc] initWithFrame:CGRectMake(110, 10, 145, 30)];
[[cell textLabel] setText:@"API Key:"];
[cell.contentView addSubview:apiKeyField];
}
}
return cell;
}
- (IBAction)segmentChanged:(id)sender {
[storeFinderTableView reloadData];
}