Ios UITableView排序

我参与了这个项目，以前的开发人员通过使用xib文件，然后注册NIB来定制表格单元格和标题，如下所示：

[self.accountTable registerNib:[UINib nibWithNibName:kNonATITableViewCellLandscapeNib bundle:[NSBundle mainBundle]] forCellReuseIdentifier:kNonATITableViewCellLandscapeIdentifier];

[self.accountTable registerNib:[UINib nibWithNibName:kNonATITableHeaderLandscapeNib bundle:[NSBundle mainBundle]] forCellReuseIdentifier:kNonATITableHeaderLandscapeId];

头文件中有按钮和UIImageView。按钮用于排序，UIImageView用于显示排序方向（asc、desc）的箭头图标。所有按钮和图像视图都是IBOutlet。所有按钮都链接到iAction：

- (IBAction)sortButtonTouched:(id)sender;

该文件还有两个其他属性：

@property (nonatomic, assign) SortType currentSortingOption;
@property (nonatomic, strong) UIButton* btnLastTouched;

这里是SortButtoTouched：

- (IBAction)sortButtonTouched: (UIButton*) buttonTouched {

    if (!self.btnLastTouched) {
        self.btnLastTouched = buttonTouched;
    }

    NSString* strFieldToSort;
    UIImageView* ivSortImage;

    NSArray* arrSortIcons = [[NSArray alloc] initWithObjects:self.ivAccountSort,self.ivNameSort, self.ivAddressSort, self.ivCitySort, self.ivZipSort, self.ivLastCallSort, self.ivMileageSort, nil];

    //get the image for the button selected
    if (buttonTouched.tag == 0) {
        strFieldToSort = @"customerNumber";
        ivSortImage = self.ivAccountSort;
    } else if (buttonTouched.tag == 1) {
        strFieldToSort = @"customerName";
        ivSortImage = self.ivNameSort;
    } else if (buttonTouched.tag == 2) {
        strFieldToSort = @"address";
        ivSortImage = self.ivAddressSort;
    } else if (buttonTouched.tag == 3) {
        strFieldToSort = @"city";
        ivSortImage = self.ivCitySort;
    } else if (buttonTouched.tag == 4) {
        strFieldToSort = @"zip";
        ivSortImage = self.ivZipSort;
    } else if (buttonTouched.tag == 5) {
        strFieldToSort = @"lastCallDate";
        ivSortImage = self.ivLastCallSort;
    } else if (buttonTouched.tag == 6) {
        strFieldToSort = @"mileage";
        ivSortImage = self.ivMileageSort;
    }

    //set the sort option and add icon
    if (!self.currentSortingOption) {

        self.currentSortingOption = SORT_ASC;
        [ivSortImage setImage:[UIImage imageNamed:Ascending_Icon]];

    } else {

        if (![self.btnLastTouched isEqual:buttonTouched]) {
            self.currentSortingOption = SORT_ASC;
            [ivSortImage setImage:[UIImage imageNamed:Ascending_Icon]];

        } else {

            if (self.currentSortingOption == SORT_ASC) {
                self.currentSortingOption = SORT_DESC;
                [ivSortImage setImage:[UIImage imageNamed:Descending_Icon]];
            } else {
                self.currentSortingOption = SORT_ASC;
                [ivSortImage setImage:[UIImage imageNamed:Ascending_Icon]];
            }

        }


    }

    //show and hide
    for(int i=0; i<arrSortIcons.count; i++) {

        UIImageView* ivThisImage = [arrSortIcons objectAtIndex:i];

        if (buttonTouched.tag == i) {
            [UIView animateWithDuration:.25 animations:^(void) {
                ivThisImage.alpha = 1.0;
           }];
        } else {
            [UIView animateWithDuration:.25 animations:^(void) {
                ivThisImage.alpha = 0.0;
            }];
        }

    }



    //call back to routing view controller and sort results based on sort order and field selected
    NSDictionary* dictUserData = [[NSDictionary alloc] initWithObjectsAndKeys:
                                 @"Sort Non-ATI", @"Action",
                                  strFieldToSort, @"Field To Sort",
                                  [NSNumber numberWithLong:self.currentSortingOption], @"Sortng Option",
                                 nil];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"rvc" object:self userInfo:dictUserData];


    self.btnLastTouched = buttonTouched;


}

现在有两个问题。如果发送通知，图标不会显示。注释掉通知，它们将按预期运行。另一个问题是属性currentSortingOption不保留其值。我认为这两个问题是相关的，但我不是100%确定。重新加载tableview时，是否会再次实例化标头？这对我来说是有意义的，因为uiimageviews将在没有图像的情况下重置，并且属性将丢失其值并重置为0（它是typedef的值）

因此，我是正确的，我如何解决这个问题？如果不是，是什么导致了这些问题

---

谢谢

好的，很抱歉发帖后马上解决了我的问题，我想有时候你只需要把问题写出来就可以找到解决办法。我所需要做的不是重新加载表，而是重新加载行。以下是更新的方法：

• （void）SortNonatireResults:（NSDictionary*）dictSortParams{
  如果（self.arrNonATIResults.count>0）{

  NSString*sortKey=[dictSortParams objectForKey:@“要排序的字段”]；
  //将字段更改为排序以匹配customerInfo对象属性。。。
  NSNumber*numSortType=[dictSortParams objectForKey:@“Sortng选项”]；
  BOOL-isAsc=是；
  如果（[numSortType intValue]==2）{
  isAsc=否；
  }
  NSSortDescriptor*sortDescriptor=[[NSSortDescriptor alloc]initWithKey:sortKey升序：isAsc]；
  NSArray*arrsortdescriptor=[[NSArray alloc]initWithObjects:sortddescriptor，nil]；
  NSArray*arrSortedNonatireResults=（NSArray*）[self.arrNonatiresResults sortedDarray使用描述符：arrSortDescriptors]；
  self.arrNonATIResults=[arrsortednonairesults mutableCopy]；
  self.arrDatasource=self.arrnataresults；
  dispatch\u async（dispatch\u get\u main\u queue（）^{
  NSMutableArray*indexPathArray=[[NSMutableArray alloc]init]；
  对于（NSInteger section=0；section<[self.accountable numberOfSections]；++section）
  {
  对于（NSInteger行=0；行<[self.accountable numberofrowsinssection:section]；++行）
  {
  [indexPathArray addObject:[NSIndExpathIndExpathForRow:row-inSection:section]；
  }
  }
  [self.accountTable重新加载RowsatindExpaths:InExpathArray with RowAnimation:UITableViewRowAnimationNone]；
  [self.accountTable ScrollStop]；
  });
  

  } }

- (void) sortNonATIResults : (NSDictionary*) dictSortParams {

    if (self.arrNonATIResults.count > 0) {

        NSString* sortKey = [dictSortParams objectForKey:@"Field To Sort"];

        //change the field to sort to match the customerInfo object properties...

        NSNumber* numSortType = [dictSortParams objectForKey:@"Sortng Option"];

        BOOL isAsc = YES;
        if ([numSortType intValue] == 2) {
            isAsc = NO;
        }

        NSSortDescriptor* sortDescriptor = [[NSSortDescriptor alloc] initWithKey:sortKey ascending:isAsc];

        NSArray* arrSortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];

            NSArray* arrSortedNonATIResults = (NSArray*)[self.arrNonATIResults sortedArrayUsingDescriptors:arrSortDescriptors];

            self.arrNonATIResults = [arrSortedNonATIResults mutableCopy];
            self.arrDatasource = self.arrNonATIResults;

            [self.accountTable reloadData];


    }
}

NSString* sortKey = [dictSortParams objectForKey:@"Field To Sort"];

//change the field to sort to match the customerInfo object properties...

NSNumber* numSortType = [dictSortParams objectForKey:@"Sortng Option"];

BOOL isAsc = YES;
if ([numSortType intValue] == 2) {
    isAsc = NO;
}

NSSortDescriptor* sortDescriptor = [[NSSortDescriptor alloc] initWithKey:sortKey ascending:isAsc];

NSArray* arrSortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];

    NSArray* arrSortedNonATIResults = (NSArray*)[self.arrNonATIResults sortedArrayUsingDescriptors:arrSortDescriptors];

    self.arrNonATIResults = [arrSortedNonATIResults mutableCopy];
    self.arrDatasource = self.arrNonATIResults;


dispatch_async(dispatch_get_main_queue(), ^{
    NSMutableArray *indexPathArray = [[NSMutableArray alloc] init];
    for (NSInteger section = 0; section < [self.accountTable numberOfSections]; ++section)
    {
        for (NSInteger row = 0; row < [self.accountTable  numberOfRowsInSection:section]; ++row)
        {
            [indexPathArray addObject:[NSIndexPath indexPathForRow:row inSection:section]];
        }
    }

    [self.accountTable reloadRowsAtIndexPaths:indexPathArray withRowAnimation:UITableViewRowAnimationNone];

    [self.accountTable scrollsToTop];
});