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我正在使用UISearchBar在UITableView單元中搜索名稱。在UISearchBar中輸入字符時如何保留單元格狀態？使用UISearchBar時保留UITableView單元狀態
我分配了cellForRowAtIndexPath中的複選框，並假設我做出瞭如下面屏幕截圖所示的選擇。
現在，如果我開始以字母「S」搜索，複選框狀態爲「未選中」作爲可以看到下面。
如何留住即使細胞被「過濾」，而搜索的複選框狀態。我知道每次當我們在UISearchBar中輸入文本時，都會調用 cellForRowAtIndexPath。 以下是我的cellForRowAtIndexPath方法。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//static NSString *cellId = @"CheckBoxedCell";
NSString *cellId = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
CheckBoxedCellClass *cell = (CheckBoxedCellClass *)[self.tableViewContact dequeueReusableCellWithIdentifier:cellId];
if(!cell)
{
NSArray *nib;
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
nib = [[NSBundle mainBundle] loadNibNamed:@"CheckBoxedCellClass" owner:self options:nil];
}
else if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
nib = [[NSBundle mainBundle] loadNibNamed:@"CheckBoxedCellClass_iPad" owner:self options:nil];
}
for (id object in nib)
{
if([object isKindOfClass:[CheckBoxedCellClass class]])
{
cell = (CheckBoxedCellClass *)object;
break;
}
}
cell = [nib objectAtIndex:0];
}
//handling check box
NSInteger rowNumber = 0;
for(NSInteger i = 0; i < indexPath.section ; i++)
{
rowNumber += [self tableView:self.tableViewContact numberOfRowsInSection:i];
}
rowNumber += indexPath.row;
SaveCheckBoxedView *saveContact;
if(isFiltered == YES)
{
saveContact = [filterdArray objectAtIndex:indexPath.row];
cell.nameLabel.text = saveContact.nameString;
cell.companyLabel.text = saveContact.companyString;
}
else
{
saveContact = [mutableArray objectAtIndex:indexPath.row];
cell.nameLabel.text = [[objectsForCharacters objectForKey:[arrayOfCharacters objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];
cell.companyLabel.text = [NSString stringWithFormat:@"%@", [companyArray objectAtIndex:rowNumber]];
}
cell.invIdLabel.text = [NSString stringWithFormat:@"%@", saveContact.invitId];
UIButton *checkBox;
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
checkBox = [[UIButton alloc]initWithFrame:CGRectMake(7, 8, 30, 30)];
}
else
{
checkBox = [[UIButton alloc]initWithFrame:CGRectMake(15, 13, 30, 30)];
}
[checkBox setImage:[UIImage imageNamed:@"checkBox.png"] forState:UIControlStateNormal];
[checkBox addTarget:self action:@selector(checkBoxClicked:event:) forControlEvents:UIControlEventTouchUpInside];
// handle check box view reset when scrolled
if(isFiltered == YES)
{
NSLog(@"filtered");
checkBox.tag = indexPath.row;
BOOL buttonPressed = [[boolDict objectForKey:[NSString stringWithFormat:@"%d", indexPath.row]] boolValue];
NSLog(@"Row number = %d", indexPath.row);
[checkBox setSelected:buttonPressed];
if(buttonPressed)
{
[checkBox setImage:[UIImage imageNamed:@"checkBoxMarked.png"] forState:UIControlStateNormal];
}
else
{
[checkBox setImage:[UIImage imageNamed:@"checkBox.png"] forState:UIControlStateNormal];
}
}
else
{
BOOL buttonPressed = [[boolDict objectForKey:[NSString stringWithFormat:@"%d", rowNumber]] boolValue];
NSLog(@"Row number = %d", rowNumber);
[checkBox setSelected:buttonPressed];
if(buttonPressed)
{
[checkBox setImage:[UIImage imageNamed:@"checkBoxMarked.png"] forState:UIControlStateNormal];
}
else
{
[checkBox setImage:[UIImage imageNamed:@"checkBox.png"] forState:UIControlStateNormal];
}
checkBox.tag = rowNumber;
}
[cell.contentView addSubview:checkBox];
return cell;
}
-(void)checkBoxClicked:(id)sender event:(id)event
{
NSSet *touches = [event allTouches];
UITouch *touch = [touches anyObject];
CGPoint currentTouchPosition = [touch locationInView:self.tableViewContact];
NSIndexPath *indexPath = [self.tableViewContact indexPathForRowAtPoint: currentTouchPosition];
NSLog(@"value of indexPath.section %d ,indexPath.row %d",indexPath.section,indexPath.row);
UIButton *tappedButton = (UIButton*)sender;
NSLog(@"Tag number = %d", [sender tag]);
if([tappedButton.currentImage isEqual:[UIImage imageNamed:@"checkBox.png"]])
{
[sender setImage:[UIImage imageNamed: @"checkBoxMarked.png"] forState:UIControlStateNormal];
NSUserDefaults *buttonDefault = [NSUserDefaults standardUserDefaults];
[buttonDefault setBool:YES forKey:@"CHECKMARKEDKEY"];
[self.boolDict setObject:[NSNumber numberWithBool:YES] forKey:[NSString stringWithFormat:@"%d", [sender tag]]];
if(isFiltered == YES)
{
NSString *addId = [filteredArrayOfIds objectAtIndex:indexPath.row];
NSLog(@"filterd id = %@", addId); //get filtered array here
[arrayOfIds addObject:addId];
}
else
{
NSString *finalIntId = [mutableArrayOfIds objectAtIndex:tappedButton.tag];
NSLog(@"Tagged checked button id = %@", finalIntId);
[arrayOfIds addObject:finalIntId];
}
}
else
{
[sender setImage:[UIImage imageNamed:@"checkBox.png"]forState:UIControlStateNormal];
NSLog(@"UnChecked");
[self.boolDict setObject:[NSNumber numberWithBool:NO] forKey:[NSString stringWithFormat:@"%d", [sender tag]]];
if(isFiltered == YES)
{
[arrayOfIds removeObjectIdenticalTo:[filteredArrayOfIds objectAtIndex:tappedButton.tag]];
}
else
{
[arrayOfIds removeObjectIdenticalTo:[mutableArrayOfIds objectAtIndex:tappedButton.tag]];
}
}
}
而且UISearhBar方法如下
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
[email protected]"";
[searchBar setShowsCancelButton:NO animated:YES];
[searchBar resignFirstResponder];
[self.tableViewContact reloadData];
[self.tableViewContact scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
if(searchText.length == 0)
{
isFiltered = NO;
}
else
{
isFiltered = YES;
filterdArray = [[NSMutableArray alloc] init];
filteredArrayOfIds = [[NSMutableArray alloc] init];
for (SaveCheckBoxedView *contact in mutableArray)
{
NSRange nameRange = [contact.nameString rangeOfString:searchText options:NSCaseInsensitiveSearch];
if(nameRange.location != NSNotFound)
{
[filterdArray addObject:contact];
[filteredArrayOfIds addObject:contact.invitId];
}
}
}
[self.tableViewContact reloadData];
}
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
[searchBar setShowsCancelButton:NO animated:YES];
}
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
[self.mySearchBar resignFirstResponder];
[mySearchBar setShowsCancelButton:NO animated:YES];
}
- (void) searchDisplayController:(UISearchDisplayController *)controller didLoadSearchResultsTableView:(UITableView *)tableView
{
[tableViewContact registerClass:[CheckBoxedCellClass class] forCellReuseIdentifier:@"SaveContactCellID"];
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[filterdArray removeAllObjects];
if(searchString.length > 0)
{
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains [search] %@", self.mySearchBar.text];
for (NSString *key in arrayOfCharacters)
{
NSArray *matches = [objectsForCharacters[key] filteredArrayUsingPredicate:predicate];
[filterdArray addObjectsFromArray:matches];
}
}
return YES;
}
- (void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller
{
[self.tableViewContact reloadSectionIndexTitles];
}
你的代碼是很長（太長IMO）所以我只是做一個一些想法...你在哪裏存儲一個單元格被檢查？您可以將它保存在數據源中。或者創建一個存儲所有選定對象（不是單元格..對象）的數組。然後在你的'cellForRowAtIndexPath'中添加，你可以比較'如果self.selectedObjects包含對象然後設置checked'或類似的東西 – Marc
我正在使用鍵值對。在cellForRowAtIndexPath中查看'boolDict'是'NSMutableDictionary'來存儲選中的複選框狀態。 –
如果我理解正確，你的關鍵是行號，你的價值是一個布爾值。如果你檢查你的第五個條目，會有類似於「@ {@ 5：@YES}」的東西。但是如果你過濾你的表格，第五個單元格將成爲第一個單元格。因此，你應該使用一個更好的鍵（'SaveCheckBoxedView'似乎是你的數據源對象（奇怪名稱btw），也許存儲） – Marc