NSSortDescriptor不更新UITableView

Question

我正在尝试使用NSSortDescriptor在UISegmentedControl中对我的表视图进行排序。当我记录数组排序时，它会显示正确的排序顺序，但是表视图在调用self.tableView reloadData之后不会更新；

数据来自一个由json提要填充的数组。我不使用NSObjects来显示表视图，它都是从NSArray填充的。见下面的代码：

@interface LinksTableViewController (){

    NSArray *data;

}

@property (strong, nonatomic) NSArray *links;
@property (strong, nonatomic) NSArray *tNames;
@property (strong, nonatomic) NSArray *dThor;
@property (strong, nonatomic) NSArray *theLinker;
@property (strong, nonatomic) NSArray *anText;
@property (strong, nonatomic) NSArray *noDo;

@end

@implementation LinksTableViewController



- (void)viewDidLoad {
    [super viewDidLoad];

    UISegmentedControl *statFilter = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"STAT1", @"STAT2", @"STAT3", @"STAT4", nil]];
    [statFilter sizeToFit];
    [statFilter addTarget:self action:@selector(MySegmentControlAction:) forControlEvents: UIControlEventValueChanged];
    self.navigationItem.titleView = statFilter;

    [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(refreshdelay:) userInfo:nil repeats:NO];

}

- (void)MySegmentControlAction:(UISegmentedControl *)segment
{
    NSArray *arrayToSort = data;

    if (segment.selectedSegmentIndex == 0)
    {

        NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"pda" ascending:NO];
        arrayToSort = [arrayToSort sortedArrayUsingDescriptors:@[sortDescriptor]];

        NSLog(@"%@", arrayToSort);

    }
    else if (segment.selectedSegmentIndex == 1)
    {


    }
    else if (segment.selectedSegmentIndex == 2)
    {

    }
    else if (segment.selectedSegmentIndex == 3)
    {

    }

    [self.tableView reloadData];
}

-(void)refreshdelay:(NSTimer*)timer
{

    NSString *myString = [links absoluteString];
    NSURL *JSONData = [NSURL URLWithString:myString];
    NSData *datas = [NSData dataWithContentsOfURL:JSONData];
    NSURLRequest *request = [NSURLRequest requestWithURL:JSONData];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    operation.responseSerializer = [AFJSONResponseSerializer serializer];
    operation.responseSerializer.acceptableContentTypes = [operation.responseSerializer.acceptableContentTypes setByAddingObject:@"text/html"];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        NSArray *jsonResult = [NSJSONSerialization JSONObjectWithData:datas options:kNilOptions error:nil];

        data = jsonResult;
        NSMutableArray *names = [NSMutableArray array];
        NSMutableArray *bLinks = [NSMutableArray array];
        NSMutableArray *daThor = [NSMutableArray array];
        NSMutableArray *bsLink = [NSMutableArray array];
        NSMutableArray *ancTxt = [NSMutableArray array];
        NSMutableArray *folLowd = [NSMutableArray array];


        for (id itemfeed in jsonResult){
            [names addObject:[NSString stringWithFormat:@"%@", itemfeed[@"ut"]]];
            [bsLink addObject:[NSString stringWithFormat:@"%@", itemfeed[@"uu"]]];
            [bLinks addObject:[NSString stringWithFormat:@"%@", itemfeed[@"upa"]]];
            [daThor addObject:[NSString stringWithFormat:@"%@", itemfeed[@"pda"]]];
            [ancTxt addObject:[NSString stringWithFormat:@"%@", itemfeed[@"lt"]]];
            [folLowd addObject:[NSString stringWithFormat:@"%@", itemfeed[@"lf"]]];
            self.links = names;
            self.tNames = bLinks;
            self.dThor = daThor;
            self.theLinker = bsLink;
            self.anText = ancTxt;
            self.noDo = folLowd;
        }

        [self.tableView reloadData];


    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {


    }];

    [operation start];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    // UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    static NSString *Cellidentifier = @"DataTableCellId";
    LICustomCell *cell = (LICustomCell *) [tableView dequeueReusableCellWithIdentifier:Cellidentifier];
    if (cell == nil) {

        cell = [[LICustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:Cellidentifier];

        NSArray *nib = [[NSBundle mainBundle]loadNibNamed:@"LiCellView" owner:self options:nil];
        cell = nib[0];

        NSString *sLink = self.links[indexPath.row];
        NSString *aLink = self.tNames[indexPath.row];
        NSString *aDa = self.dThor[indexPath.row];
        NSString *theInk = self.theLinker[indexPath.row];
        NSString *thAnk = self.anText[indexPath.row];
        NSString *fLink = self.noDo[indexPath.row];

        cell.ageLable.text = theInk;

    }


    return cell;
}

Answer 1

看起来您的tableView的数据位于6个不同的数组中。

        NSString *sLink = self.links[indexPath.row];
        NSString *aLink = self.tNames[indexPath.row];
        NSString *aDa = self.dThor[indexPath.row];
        NSString *theInk = self.theLinker[indexPath.row];
        NSString *thAnk = self.anText[indexPath.row];
        NSString *fLink = self.noDo[indexPath.row];

你不应该把它们都分类吗？现在，您的代码还不清楚arrayToSort是如何连接到tableView的数据模型的。您有NSArray *arrayToSort = data;，但是不清楚数据是在哪里初始化的，也不清楚数据是在哪里设置的(似乎您希望在JSON竞争块中设置它)。您还需要调用self.tableView reloadData；在MySegmentControlAction的末尾。

您可以创建一个具有6个NSObject属性的NSString子类，将其称为MyObject (但更具有描述性)。然后做一些如下的事情：

for (id itemfeed in jsonResult){
            MyObject *object = [[MyObject alloc]init];
            object.sLink = [NSString stringWithFormat:@"%@", itemfeed[@"ut"]];
            object.aLink = [NSString stringWithFormat:@"%@", itemfeed[@"uu"]];
            ...

           [self.data addObject:object];

        }

在JSON竞赛区。

然后将cellForRowAtIndexPath更改为包含以下内容

MyObject *object = [self.data objectAtIndex:indexPath.row]
cell.ageLable.text = object.theInk;

如果您走这条路线，您还需要更新：

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"pda" ascending:NO];

具体而言，@"pda“无论您在NSObject子类中将属性命名为什么。@"dThor“，如果您按照我使用的命名。