Question

当我向上或向下滚动时，

我的tableview会更改值。它似乎使用表中其他部分的相同值。我想象它在我的单元格创建中出错，这是代码。请告诉我我做错了什么，谢谢！

已编辑添加整个代码

//global indexpath to remember which cell tapped
NSIndexPath *globalPath;
@interface SearchViewController ()

@end

@implementation SearchViewController

//Load implementation once per launch
- (void)viewDidLoad
{
    [super viewDidLoad];
    [self linkInputTableToDelegate];
    _temporaryResultsArray =[[NSMutableArray alloc]init];
    _flurryArray=[[NSMutableArray alloc]init];
    _numberOfSections=6;
}

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:NO];
    [InputTable reloadData];

    textFromUserDefaults=[[[HelperMethods alloc]init]getObjectUserDefault:@"textFiltered"];
    [self addTextToFlurryArrayForFlurryAndSavedLists:_textFromUserDefaults];



}
-(void)viewDidDisappear:(BOOL)animated{

}

- (IBAction)searchButtonPressed:(UIButton *)sender {
     self.tabBarController.selectedIndex = 1;
}


//Makes the input table respond to delegate table view methods
-(void)linkInputTableToDelegate{
    _inputTable.dataSource=self;
    _inputTable.delegate=self;
}

-(void)performSearch:(NSString*)text{
    //do search
}

#pragma mark - Table view data source


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    int numberOfRows=_numberOfSections;

    //Rows for iPhone 4
    if ([[UIScreen mainScreen]bounds].size.height==480) {
        numberOfRows=numberOfRows;
        //Rows for iPhone 5
    }else if ([[UIScreen mainScreen]bounds].size.height==568){
        numberOfRows=numberOfRows+1;
    }
    return numberOfRows;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    //In reality groups are created with 1 row inside, this is to allow spacing between the rows

    return 1;

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *kCellID = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];

    if (!cell) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID];
    }

    //Is the cell the same as the one clicked when going to ingredient filter
    BOOL cellIndexPathSameAsSelected=[self isCellIndexSameAsPreviousClicked:indexPath];

    cell.textLabel.textColor=[UIColor blackColor];
    if (cellIndexPathSameAsSelected && _textFromUserDefaults!=nil) {

        if (![cell.textLabel.text isEqualToString:_textFromUserDefaults]) {

            cell.textLabel.text=_textFromUserDefaults;
            [self performTextSearch:_textFromUserDefaults];
        }

    }
    return cell;
}

//Compares the previous clicked cell with the cell now selected
-(BOOL)isCellIndexSameAsPreviousClicked: (NSIndexPath*)cellPath{

    if (cellPath.row == globalPath.row && globalPath.section==cellPath.section) {
        return YES;
    }
    else{
        return NO;
    }
}

- (void)updateTableViewWithExtraRow :(NSIndexPath*)rowSelected{
    NSLog(@"number of sections =%i",_numberOfSections);
    if (rowSelected.section == _numberOfSections) {
        _numberOfSections ++;
    }
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *cellText = [tableView cellForRowAtIndexPath:indexPath].textLabel.text;
    [[[HelperMethods alloc]init]saveObjectToUserDefaults:cellText :@"textFiltered"];
    globalPath = indexPath;
    [self updateTableViewWithExtraRow:indexPath];
}

-(void)addTextToFlurryArrayForFlurryAndSavedLists:(NSString*)text{
    if ([_flurryArray count]==0 &&[text length]>0) {
        [_flurryArray addObject:text];
    }
    for (int i=0;i<[_flurryArray count];i++) {
        NSString *textInArray=[_flurryArray objectAtIndex:i];
        if (![textInArray isEqualToString:text]) {
            [_flurryArray addObject:text];
        }

    }
    NSLog(@"Total number of saved items = %i",[_flurryArray count]);
}

// Dispose of any resources that can be recreated.
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

Answer 1

问题是，只有满足这些条件时，才会更改单元格中的文本。例如，当您的cellIndexPathSameAsSelected为NO时，您不会修改该单元格。所以你应该添加一个else并在那里做一些设置。

修改

if (cellIndexPathSameAsSelected && _textFromUserDefaults!=nil) { if (![cell.textLabel.text isEqualToString:_textFromUserDefaults]) { cell.textLabel.text=_textFromUserDefaults; [self performTextSearch:_textFromUserDefaults]; } } else { cell.textLabel.text = [NSString string]; }

Answer 2

在[tableView dequeueReusableCellWithIdentifier:kCellID];来电之后，您必须使用以下声明检查您的手机是否真的可以重复使用：

if (!cell) {
    cell = [[UITableViewCell alloc] initWithStyle:...];
}

Answer 3

你应该做这样的事情

static NSString *kCellID = @"Cell";

// Acquire the cell if possible. 
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
if (cell == nil) // Not possible to re-use cell, so create a new cell
{
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID];
}

滚动我的tableview时值会更改

3 个答案: