ios - 下拉刷新功能不起作用

Question

我已经将代码放入下面，它看起来很接近，但我不明白为什么它没有进行实际的刷新。它有“拉动刷新”和正确显示更新的文本，但它没有更新实际数据。我是否遗漏了一些明显的东西，或者我放错了地方还是什么？

我编辑添加了 self TableView 调用以重新加载数据。仍然没有运气。

最终编辑___下面的用户通过调用数据提要解决了这个问题。

- (void)viewDidLoad
{
[super viewDidLoad];

UIRefreshControl *refresh = [[UIRefreshControl alloc] init];
refresh.attributedTitle = [[NSAttributedString alloc] initWithString:@"Pull to refresh"];
[refresh addTarget:self action:@selector(refreshmytable:)   forControlEvents:UIControlEventValueChanged];
self.refreshControl = refresh;

NSURLSessionConfiguration *config =
[NSURLSessionConfiguration defaultSessionConfiguration];

_session = [NSURLSession sessionWithConfiguration:config
                                         delegate:self
            //   delegate:nil
                                    delegateQueue:nil];

[self fetchFeed];



}

- (void)refreshmytable:(UIRefreshControl *)refreshControl{

[self fetchFeed]; //Added 12:12 9.16.14
refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"Updating"];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"MMM d, h:mm a"];
NSString *updated = [NSString stringWithFormat:@" Last Update: %@", [formatter     stringFromDate:[NSDate date]]];
refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:updated];
                                  [refreshControl endRefreshing];

[self.tableView reloadData]; //Added this 11:32 9.16.14

}





- (void)fetchFeed
{
 NSString *userEID = MAP_getUsername();
 //NSLog(userEID);

 NSString *requestString1 = [@"URL" stringByAppendingString:userEID];

 NSString *requestString2 = @"&status=pending";

 NSString *requestString = [requestString1 stringByAppendingString:requestString2];

 //NSLog(requestString);

 /*NSString *requestString = @"http://URL";
*/
NSURL *url = [NSURL URLWithString:requestString];
NSURLRequest *req = [NSURLRequest requestWithURL:url];

NSURLSessionDataTask *dataTask =
[self.session dataTaskWithRequest:req
                completionHandler:
 ^(NSData *data, NSURLResponse *response, NSError *error) {


     NSDictionary *jsonObject = [NSJSONSerialization JSONObjectWithData:data
                                                                options:0
                                                                 error:nil];
     self.changeList = jsonObject[@"List"];
     //self.changeList=nil; //tried to add here to remove duplicate data

     NSLog(@"%@", self.changeList);

     //- add code here to populate BNRItemStore with the change order list.
     // - following code should be rewritten in fetchFeed that will load BNRItemStore.
     if (self.changeList.count>0) {
         for (int i = 0; i < self.changeList.count; i++) {
             NSDictionary *coItem = self.changeList[i];

             [[BNRItemStore sharedStore]
              addItemWithApproverEid:coItem[@"approverEid"]
              assignmentGroup:coItem[@"assignmentGroup"]
              changeOrder:coItem[@"changeOrder"]
              subcategory:coItem[@"subCatagory"]
              title:coItem[@"title"]


              ];
         }
     }
     //NSLog(@"sizeof(NSInteger) = %@", @(sizeof(NSInteger)));
     //- end comment

     dispatch_async(dispatch_get_main_queue(), ^{
        [self.tableView reloadData];
     });
     //self.changeList=nil; //trying to null out list for refresh non duplicate data


   //  NSString *json = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
   //  NSLog(@"%@", json);
 }];


[dataTask resume];
}

Answer 1

您没有获取新数据。您有一个在 viewDidLoad 中调用的方法/消息调用 fetchFeed，但您从未在刷新方法/消息中调用它。我假设如果刷新，则需要获取新数据。调用“[self fetchFeed];”在重新加载 TableView 之前。如果您是异步获取数据，那么当获取新数据完成时，您需要在完成 block 中重新加载 TableView 。