[英]UITextViews not cleared when selected in a UITableView
我正在實現帶有文本視圖作為單元格內容視圖的UITableView。
當用戶按下返回鍵時,用戶輸入的數據將保存在設置字典中:
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (textField == _textFieldOne){
[settingsDictionary setObject: _textFieldOne.text forKey:@"EntryOneText"];
[settingsDictionary stringValueForKey:@"textFieldOneValue"];
[self postNotificationSettingsUpdate:settingsDictionary];
didTestPostNotificationSettings = YES;
}
當用戶返回屏幕時,這些保存的值應顯示在文本字段中,這是我使用以下代碼完成的:
//Set the value in the text fields from the settings dictionary
NSString *textFieldOneText = [self.settingsDictionary stringValueForKey:@"RedZoneCarsPerManHrMin"];
_textFieldOne.text = textFieldOneValue;
到目前為止,一切似乎都按預期工作:文本輸入已保存,並在用戶返回屏幕時顯示在文本字段中。 但是,如果選擇了包含文本字段的TableView的行 (而不是文本字段本身 ),則文本字段將顯示以下行為:
似乎該文本字段同時顯示了新輸入的條目以及上次保存的條目。
編輯我在下面添加了更多的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;
}
編輯兩個下面是我根據jherran的答案來解決我的問題的嘗試。 但是,我仍然遇到同樣的問題。
- (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;
如何修改我的代碼,以便不會發生此現象?
檢查cellForRowAtIndexPath
,因為單元被重用,您可能未加載單元屬性。
- (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";
}
編輯:當單元格退出並被重用時,每次單元格被重用時,您都將添加一個視圖( [cell.contentView addSubview:_textFieldOne]
)。
好的,這是我所懷疑的。 每次將單元格從重用隊列中取出時,您都將創建一個新的文本字段實例,並將其添加到內容視圖中。 因此,基本上,內容視圖會堆積新的文本字段。 你應該做的是
1)具有一個自定義單元,並使該單元成為負責其內部的唯一類
2)僅公開一種配置方法以將原始文本傳遞給單元格
3)當單元被重用時,調用該配置方法。
4)保留對自定義單元格內文本字段的引用,以便能夠在任何時間(包括時間)更新文本值。 在cellforrowatindexpath中回收時
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