使用 UISearchBar 时保留 UITableView 单元格状态 [英] Retain UITableView cell state when UISearchBar is used
本文介绍了使用 UISearchBar 时保留 UITableView 单元格状态的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用 UISearchBar 在 UITableView 单元格中搜索名称.UISearchBar中输入字符时如何保持单元格状态?
I am using UISearchBar to search names in UITableView cells. How to retain the cell state when charachters are entered in UISearchBar?
我在 cellForRowAtIndexPath 中分配了复选框，并假设我做出了如下面的屏幕截图所示的选择.
I allocated the checkbox in cellForRowAtIndexPath and suppose I made the selection as shown in the screenshot below.
现在，如果我用字母S"开始搜索，复选框状态为未选中"，如下所示.
Now if I start searching with letter 'S', checkBox state is 'unchecked' as can be seen below.
即使在搜索时单元格被过滤"，我如何保留复选框状态.我知道cellForRowAtIndexPath 每次我们在 UISearchBar 中输入文本时都会调用.下面是我的 cellForRowAtIndexPath 方法.
How do I retain the checkBox state even if the cells are "filtered" while searching. I am aware that
cellForRowAtIndexPath is invoked every time when we enter text in UISearchBar.
Below is my cellForRowAtIndexPath method.
- (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]];
}
}
}
和UISearhBar方法如下
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
searchBar.text=@"";
[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];
}
推荐答案
用以下代码解决了我自己的问题
Solved my own issue with the following code
- (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];
}
//set fonts
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
[cell.companyLabel setFont:[UIFont italicSystemFontOfSize:10.0]];
}
else
{
[cell.companyLabel setFont:[UIFont italicSystemFontOfSize:14.0]];
}
//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");
BOOL buttonPress = [[boolDictForSearch objectForKey:[filteredArrayOfIds objectAtIndex:indexPath.row]] boolValue];
NSLog(@"button press = %d", buttonPress);
[checkBox setSelected:buttonPress];
if(buttonPress)
{
[checkBox setImage:[UIImage imageNamed:@"checkBoxMarked.png"] forState:UIControlStateNormal];
}
else
{
[checkBox setImage:[UIImage imageNamed:@"checkBox.png"] forState:UIControlStateNormal];
}
checkBox.tag = indexPath.row;
}
else
{
BOOL buttonPressed = [[boolDict objectForKey:[NSString stringWithFormat:@"%d", rowNumber]] boolValue];
NSLog(@"button pressED = %d", buttonPressed);
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]]];
//[self.boolDictForSearch setObject:[NSNumber numberWithBool:YES] forKey:[NSString stringWithFormat:@"%@", saveContact.nameString]];
if(isFiltered == YES)
{
NSString *addId = [filteredArrayOfIds objectAtIndex:indexPath.row];
[self.boolDictForSearch setObject:[NSNumber numberWithBool:YES] forKey:addId];
NSLog(@"filterd id = %@", addId); //get filtered array here
[arrayOfIds addObject:addId];
}
else
{
NSString *finalIntId = [mutableArrayOfIds objectAtIndex:tappedButton.tag];
[self.boolDictForSearch setObject:[NSNumber numberWithBool:YES] forKey:finalIntId];
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]]];
//[self.boolDictForSearch setObject:[NSNumber numberWithBool:NO] forKey:[NSString stringWithFormat:@"%@", saveContact.nameString]];
if(isFiltered == YES)
{
[arrayOfIds removeObjectIdenticalTo:[filteredArrayOfIds objectAtIndex:tappedButton.tag]];
[self.boolDictForSearch setObject:[NSNumber numberWithBool:NO] forKey:[filteredArrayOfIds objectAtIndex:tappedButton.tag]];
}
else
{
[arrayOfIds removeObjectIdenticalTo:[mutableArrayOfIds objectAtIndex:tappedButton.tag]];
[self.boolDictForSearch setObject:[NSNumber numberWithBool:NO] forKey:[mutableArrayOfIds objectAtIndex:tappedButton.tag]];
}
}
}
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