ios - TableViewController - 一个键值与其他键值的偏移

Question

我的 TableViewController 有问题。我将 3 个值发布到 tableViewController。 scoreID、scoreDate 和 scoreValue。一切似乎都正常工作，但我的问题是，scoreValue 相对于 scoreID 和 Date 偏移了 1。用图片更容易展示:

(“一个好的商业创意”应该具有“另一个好创意”的值(value)等等)现在，通过查看 .sqlite 数据库文件，我知道分数被 1 偏移了。所以我的问题是如何修复它？

我的 tableViewController.m 看起来像这样:

#import "CEWTableViewCell.h"

@interface CEWScoreTableViewController ()

@property (nonatomic) NSInteger countOfRows;
@property (nonatomic, strong) NSMutableArray *scoreIDsForTableCells;
@property (nonatomic, strong) NSArray *fetchedObjects;
@property (nonatomic, strong) NSDictionary *getScoreDataToDict;



@end

@implementation CEWScoreTableViewController{
    UITableView *tableView;
}

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    CGFloat topLayoutGuide = self.topLayoutGuide.length;
    tableView.contentInset = UIEdgeInsetsMake(topLayoutGuide, 0, 0, 0);

    tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    tableView.delegate = self;
    tableView.dataSource = self;


    [self.tableView registerClass:[CEWTableViewCell class] forCellReuseIdentifier:@"CellID"];

    tableView.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:tableView];

    //INITIALISE APPDELEGATE AND CREATE INSTANCE. MAKE FETCH REQUEST AND POPULATE DATA TO NSDICTIONARY
    CEWAppDelegate* appDelegate = [UIApplication sharedApplication].delegate;
    self.managedObjectContext = appDelegate.managedObjectContext;


    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    fetchRequest.resultType = NSDictionaryResultType;
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"ScoreData" inManagedObjectContext:self.managedObjectContext];
    [fetchRequest setEntity:entity];

    NSError *error = nil;
    self.fetchedObjects = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error];
    if (fetchRequest == nil) {
        NSLog(@"an error occured fetching objects...!");
    }


    NSLog(@"objectForKey returns: %@", self.scoreIDFromEntity);






    NSUInteger countIDsForRows = [self.fetchedObjects count];
    self.countOfRows = countIDsForRows;

}

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


#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.

//This value is set to the number of @"scoreID"s returned
    return self.countOfRows;
}


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

    CEWTableViewCell *cell = (CEWTableViewCell *)[self.tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
    if (cell == nil) {
        cell = [[CEWTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    }

    self.getIndexPath = indexPath.row;


    NSDictionary *getScoreIDs = [self.fetchedObjects objectAtIndex:[indexPath row]];

    NSDictionary *getDates = [self.fetchedObjects objectAtIndex:[indexPath row]];

    //This is just formatting the date to the format I want displayed
    NSDate *pullDates = [getDates valueForKey:@"scoreDate"];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"dd-MMM-yyyy HH:MM"];
    NSString *formattedDate = [dateFormat stringFromDate:pullDates];

    //Here I fetch the @"scoreValue"s and convert them from a string, so I can add them up
    NSDictionary *getScoreValues = [self.fetchedObjects objectAtIndex:[indexPath row]];
    NSString *convertDictKeyToString  = [getScoreValues objectForKey:@"scoreValue"];

    NSArray *items = [convertDictKeyToString componentsSeparatedByString:@","];

        double total = 0.0;
        for (NSString *string in items)
        {
            total += [string floatValue];
        }
    cell.descriptionLabel.text = [getScoreIDs objectForKey:@"scoreID"];
    cell.dateLabel.text = formattedDate;
    cell.tableCellScoreLabel.text = [NSString stringWithFormat:@"%1.1f", total];

    return cell;
}

我希望这是足够的代码，否则请告诉我，我会尝试提供更多

回答

太棒了。事实证明，由于 CGRect x,y,x,y 值，我的标签被偏移了……嗯……

Answer 1

根据我的经验，cellForRowAtIndexPath 的调用速度非常快，因此它没有太多时间来执行计算，而且据我所知，格式化程序占用的资源比您想象的要多。

我通常通过创建一个从 viewDidLoad 或 viewWillAppear 调用的新方法来解决这个问题，并在这个方法中我为我需要的数据创建一个数组或某种容器。

然后 cellForRowAtIndexPath 只需要通过索引调用数组。