[英]Tableview cell expandable with text field causes textfield to jump around
因此,我已经尝试了一段时间,以创建具有可扩展部分和一个不可扩展部分的表视图。 可扩展部分之一应在其中包含3个文本字段,您可以在其中编辑文本字段中的测试。 当您折叠该部分并将其再次扩展时,我能够获得工作的bt,文本字段突然在上方重复,有时会与上方的单元格互换。 Ihavent能够弄清楚为什么或不这样做的原因。 这个想法是当用户在字段中输入文本并选择输入时,文本将存储到数组中。
编码:
- (void)viewDidLoad{
[super viewDidLoad];
if (!expandedSections){
expandedSections = [[NSMutableIndexSet alloc] init];
}
manualSensorName = [[NSMutableArray alloc]initWithObjects: @"Sensor",@"",@"2",@"T", nil];
}
- (void)didReceiveMemoryWarning{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Expanding
- (BOOL)tableView:(UITableView *)tableView canCollapseSection:(NSInteger)section{
if (section>0) return YES;
return NO;
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 3;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
if ([self tableView:tableView canCollapseSection:section])
{
if ([expandedSections containsIndex:section])
{
return 5; // return rows when expanded
}
return 1; // only top row showing
}
// Return the number of rows in the section.
return 1;
}
- (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];
}
// Configure the cell...
if ([self tableView:tableView canCollapseSection:indexPath.section]){
if (!indexPath.row){
// first row
cell.textLabel.text = @"Expandable"; // only top row showing
if ([expandedSections containsIndex:indexPath.section])
{
UIImageView *arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrowUP.png"]];
cell.accessoryView = arrow;
}
else
{
UIImageView *arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrowDOWN.png"]];
cell.accessoryView = arrow;
}
}
else {
if (indexPath.row == 1){
NSString *flightNumText = [manualSensorName objectAtIndex:indexPath.row];
cell.textLabel.text = flightNumText;
}
else if (indexPath.row == 2){
txtManualSensor = [[UITextField alloc] initWithFrame:CGRectMake(180, 5, 120, 30)];
txtManualSensor.placeholder = @"Select";
txtManualSensor.delegate = self;
txtManualSensor.autocorrectionType = UITextAutocorrectionTypeNo;
txtManualSensor.backgroundColor = [UIColor whiteColor];
[txtManualSensor setBorderStyle:UITextBorderStyleBezel];
[txtManualSensor setTextAlignment:NSTextAlignmentCenter];
[txtManualSensor setReturnKeyType:UIReturnKeyDone];
// UITextField *playerTextField = [[UITextField alloc] initWithFrame:CGRectMake(180, 5, 120, 30)];
// playerTextField.adjustsFontSizeToFitWidth = YES;
// playerTextField.textColor = [UIColor blackColor];
// playerTextField.placeholder = @"SAMPLE";
// playerTextField.tag = 200;
// playerTextField.delegate = self;
// [cell.contentView addSubview:playerTextField];
cell.textLabel.text = @"Sensor Name";
[cell addSubview:txtManualSensor];
}
else if (indexPath.row == 3){
cell.textLabel.text = @"Some Detail";
cell.accessoryView = nil;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
}
}
else {
cell.accessoryView = nil;
cell.textLabel.text = @"Normal Cell";
}
return cell;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
[manualSensorName replaceObjectAtIndex:2 withObject:textField.text];
return YES;
}
-(BOOL) textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
return YES;
}
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
if ([self tableView:tableView canCollapseSection:indexPath.section]){
if (!indexPath.row){
[tableView beginUpdates];
// only first row toggles exapand/collapse
[tableView deselectRowAtIndexPath:indexPath animated:YES];
NSInteger section = indexPath.section;
BOOL currentlyExpanded = [expandedSections containsIndex:section];
NSInteger rows;
NSMutableArray *tmpArray = [NSMutableArray array];
if (currentlyExpanded) {
rows = [self tableView:tableView numberOfRowsInSection:section];
[expandedSections removeIndex:section];
}
else {
[expandedSections addIndex:section];
rows = [self tableView:tableView numberOfRowsInSection:section];
}
for (int i=1; i<rows; i++) {
NSIndexPath *tmpIndexPath = [NSIndexPath indexPathForRow:i inSection:section];
[tmpArray addObject:tmpIndexPath];
}
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if (currentlyExpanded) {
UIImageView *arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrowDOWN.png"]];
[tableView deleteRowsAtIndexPaths:tmpArray
withRowAnimation:UITableViewRowAnimationFade];
cell.accessoryView = arrow;
}
else {
UIImageView *arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrowUP.png"]];
[tableView insertRowsAtIndexPaths:tmpArray
withRowAnimation:UITableViewRowAnimationFade];
cell.accessoryView = arrow;
}
NSLog(@"tableview row is %ld in section %ld",(long)indexPath.row,(long)indexPath.section);
[tableView endUpdates];
}
[tableView deselectRowAtIndexPath:indexPath animated:YES];
NSLog(@"selected row is %ld in section %ld",(long)indexPath.row,(long)indexPath.section);
if (indexPath.row == 1) {
// update text fields in cell table view
}
}
}
这可能是因为更换简单UITableViewRowAnimationTop
由UITableViewRowAnimationFade
:
更改didSelectRowAtIndexPath
索引时, UITableViewCells
更改物理位置(请记住, UITableView
是UIScrollView
),并且滚动条无法跟踪您的意图 。
UITableViewRowAnimationTop
尝试调整滚动位置,但失败。
其他设计注意事项:
不要将模型(要显示的数据数组)与视图模型(显示模型的UI)混合使用。 在didSelectRowAtIndexPath
,您应该首先对模型重新排序,然后将其应用于单元格
考虑不要即时更改索引:您可能更喜欢一个实际反映视图结构的模型,即一棵树。
您是否注意到自己不尊重- (void)tableView:(UITableView *)tableView
,有时在同一方法中使用self tableView:tableView
或self.customTableView
? 您应该使用传递给您的tableView
。
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