在UITableView中选择时，UITextViews不会被清除
我实现了一个带文本视图的UITableView作为我的单元格的内容视图。
当用户点击返回键时，用户输入的数据将保存在设置字典中：
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (textField == _textFieldOne){
[settingsDictionary setObject: _textFieldOne.text forKey:@"EntryOneText"];
[settingsDictionary stringValueForKey:@"textFieldOneValue"];
[self postNotificationSettingsUpdate:settingsDictionary];
didTestPostNotificationSettings = YES;
}
当用户返回到屏幕时，这些保存的值应显示在文本字段中，我已使用以下代码完成了这些操作：
//Set the value in the text fields from the settings dictionary
NSString *textFieldOneText = [self.settingsDictionary stringValueForKey:@"RedZoneCarsPerManHrMin"];
_textFieldOne.text = textFieldOneValue;
到目前为止，一切似乎都按预期工作：文本输入被保存，并在用户返回屏幕时显示在文本字段中。但是，如果包含文本字段的TableView的行是select（而不是text-field 本身），则text-field显示如下所示的行为：< / p>
看起来好像文本字段同时显示新输入的条目以及上次保存的条目。
编辑我在下面添加了更多我的cellForRowAtIndexPath方法：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForSubscribedRedZoneAlertRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"RedZoneAlertCell";
UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
}
cell.backgroundColor = [UIColor colorWithRed:0.922 green:0.937 blue:0.949 alpha:1];
UISwitch *cellSwitch = nil;
NSNumber *position = enabledRedZoneAlertRows[indexPath.row];
switch (position.integerValue) {
case CarPerManHourRow: {
cell.textLabel.text = NSLocalizedString(@"Label", @"Label Row");
cellSwitch = [[UISwitch alloc] init];
cellSwitch.on = [[NSUserDefaults standardUserDefaults] boolForKey:SwitchKey];
cellSwitch.tag = SwitchTag;
[cellSwitch addTarget:self action:@selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
cell.accessoryView = cellSwitch;
if ([[self.settingsDictionary valueForKey:@"RedZoneCarsPerManHrOnOff"]isEqual: @"1"]){
[cellSwitch setOn:YES];
}
break;
}
case TextFieldRow: {
static NSString *CellIdentifier = @"ConfigCell";
cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
[cell.contentView addSubview:_textFieldOne];
[cell.contentView addSubview:_textFieldTwo];
[cell.contentView addSubview:_spacingLabel];
}
cell.backgroundColor = [UIColor colorWithRed:0.922 green:0.937 blue:0.949 alpha:1];
_textFieldOne = [[UITextField alloc]initWithFrame:CGRectMake(25, 0, 50, 30)];
_textFieldTwo = [[UITextField alloc]initWithFrame:CGRectMake(100, 0, 50, 30)];
_textFieldOne.delegate = self;
_textFieldTwo.delegate = self;
_textFieldOne.placeholder = @"Auto";
_textFieldTwo.placeholder = @"Auto";
[_textFieldOne setTextAlignment:NSTextAlignmentCenter];
[_textFieldTwo setTextAlignment:NSTextAlignmentCenter];
//Set the value in the text fields from the settings dictionary
NSString *textFieldOneText = [self.settingsDictionary stringValueForKey:@"RedZoneCarsPerManHrMin"];
NSString *textFieldTwoText = [self.settingsDictionary stringValueForKey:@"RedZoneCarsPerManHrMax"];
NSString *carsPerManHrMax = [self.settingsDictionary stringValueForKey:@"RedZoneCarsPerManHrMax"];
NSString *carsPerManHrMax = [self.settingsDictionary stringValueForKey:@"RedZoneCarsPerManHrMax"];
_textFieldOne.text = textFieldOneValue;
_textFieldTwo.text = textFieldTwoValue
_textFieldOne.backgroundColor = [UIColor whiteColor];
_textFieldTwo.backgroundColor = [UIColor whiteColor];
_textFieldOne.tintColor = [UIColor blackColor];
_textFieldTwo.tintColor = [UIColor blackColor];
[_textFieldOne.layer setCornerRadius:7.0f];
[_textFieldTwo.layer setCornerRadius:7.0f];
[_textFieldOne setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];
[_textFieldTwo setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];
_textFieldOne.returnKeyType = UIReturnKeyNext;
_textFieldTwo.returnKeyType = UIReturnKeyDone;
_spacingLabel = [[UILabel alloc] initWithFrame:CGRectMake(70, 0, 35, 30)];
_spacingLabel.text = @"–";
_spacingLabel.textColor = [UIColor colorWithRed:0.658 green:0.658 blue:0.658 alpha:1];
[_spacingLabel setTextAlignment:NSTextAlignmentCenter];
_spacingLabel.backgroundColor = [UIColor clearColor];
//[cell.contentView addSubview:_textFieldOne];
//[cell.contentView addSubview:_textFieldTwo];
//[cell.contentView addSubview:_spacingLabel];
break;
}
return cell;
}
编辑两个 以下是我根据jherran的答案解决问题的尝试。但是，我仍然遇到同样的问题。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForSubscribedRedZoneAlertRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"RedZoneAlertCell";
UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
}
cell.backgroundColor = [UIColor colorWithRed:0.922 green:0.937 blue:0.949 alpha:1];
UISwitch *cellSwitch = nil;
NSNumber *position = enabledRedZoneAlertRows[indexPath.row];
switch (position.integerValue) {
case CarPerManHourRow: {
cell.textLabel.text = NSLocalizedString(@"Label", @"Label Row");
cellSwitch = [[UISwitch alloc] init];
cellSwitch.on = [[NSUserDefaults standardUserDefaults] boolForKey:SWSettingCarsPerManHour];
cellSwitch.tag = SaveCarsPerManHourTag;
[cellSwitch addTarget:self action:@selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
cell.accessoryView = cellSwitch;
if ([[self.settingsDictionary valueForKey:@"RedZoneCarsPerManHrOnOff"]isEqual: @"1"]){
[cellSwitch setOn:YES];
}
break;
}
case CarsPerManHourConfigRow: {
static NSString *CellIdentifier = @"ConfigCell";
cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
cell.backgroundColor = [UIColor colorWithRed:0.922 green:0.937 blue:0.949 alpha:1];
_carsPerManHourMinTextField = [[UITextField alloc]initWithFrame:CGRectMake(25, 0, 50, 30)];
_carsPerManHourMaxTextField = [[UITextField alloc]initWithFrame:CGRectMake(100, 0, 50, 30)];
_textFieldOne.delegate = self;
_textFieldTwo.delegate = self;
_textFieldOne.placeholder = @"Auto";
_textFieldTwo.placeholder = @"Auto";
[_textFieldOne setTextAlignment:NSTextAlignmentCenter];
[_textFieldTwo setTextAlignment:NSTextAlignmentCenter];
_textFieldOne.backgroundColor = [UIColor whiteColor];
_textFieldTwo.backgroundColor = [UIColor whiteColor];
_textFieldOne.tintColor = [UIColor blackColor];
_textFieldTwo.tintColor = [UIColor blackColor];
[_textFieldOne.layer setCornerRadius:7.0f];
[_textFieldTwo.layer setCornerRadius:7.0f];
[_textFieldOne setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];
[_carsPerManHourMaxTextField setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];
_textFieldOne.returnKeyType = UIReturnKeyNext;
_textFieldTwo.returnKeyType = UIReturnKeyDone;
_spacingLabel = [[UILabel alloc] initWithFrame:CGRectMake(70, 0, 35, 30)];
_spacingLabel.text = @"–";
_spacingLabel.textColor = [UIColor colorWithRed:0.658 green:0.658 blue:0.658 alpha:1];
[_spacingLabel setTextAlignment:NSTextAlignmentCenter];
_spacingLabel.backgroundColor = [UIColor clearColor];
NSLog(@"%@", _textFieldOne.text);
NSLog(@"%@",_carsPerManHourMaxTextField.text);
[cell.contentView addSubview: _textFieldOne];
[cell.contentView addSubview: _textFieldTwo];
[cell.contentView addSubview:_spacingLabel];
cell.tag = 1;
}
else {
_textFieldOne = (UITextField *)[cell.contentView viewWithTag:1];
_textFieldTwo = (UITextField *)[cell.contentView viewWithTag:1];
_spacingLabel = (UILabel *)[cell.contentView viewWithTag:1];
}
NSString * _textFieldOne = [self.settingsDictionary stringValueForKey:@"RedZoneCarsPerManHrMin"];
NSString *carsPerManHrMax = [self.settingsDictionary stringValueForKey:@"RedZoneCarsPerManHrMax"];
_textFieldOne.text = carsPerManHrMin;
_textFieldTwo.text = carsPerManHrMax;
如何修改代码以避免此行为？
2 个答案:
答案 0 :(得分：1)
检查您的cellForRowAtIndexPath，因为重复使用了单元格，您可能没有加载单元格属性。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
/*
* This is an important bit, it asks the table view if it has any available cells
* already created which it is not using (if they are offscreen), so that it can
* reuse them (saving the time of alloc/init/load from xib a new cell ).
* The identifier is there to differentiate between different types of cells
* (you can display different types of cells in the same table view)
*/
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MyIdentifier"];
/*
* If the cell is nil it means no cell was available for reuse and that we should
* create a new one.
*/
UILabel *label;
if (cell == nil) {
/*
* Actually create a new cell (with an identifier so that it can be dequeued).
*/
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"MyIdentifier"] autorelease];
label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 30)];
cell.tag = 1;
[cell.contentView addSubview:label];
} else {
label = (UILabel *)[cell.contentView viewWithTag:1];
}
/*
* Now that we have a cell we can configure it to display the data corresponding to
* this row/section
*/
label.text = @"whatever";
}
编辑：当您的单元格退出并重复使用时，每次重复使用单元格时都会添加一个视图（[cell.contentView addSubview:_textFieldOne]）。
答案 1 :(得分：0)
好的，这是我怀疑的。每次将单元格从重用队列中取出时，都会创建一个新的textfield实例并将其添加到内容视图中。所以基本上内容视图正在堆积新的文本字段。 你应该做的是
1）拥有自定义单元格并使单元格成为其内部负责的唯一类
2）仅公开将原始文本传递给单元格的配置方法
3）重新使用thr cell时调用该配置方法。
4）保留对自定义单元格内文本字段的引用，以便能够随时更新文本值。当它在cellforrowatindexpath中回收时
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