objective c - populate UITableView -


I am struggling with a UITableView that I had worked before and somehow I broke it! This is part of a unit in the course of Paul Hegarty's

The symptom is that the scene loads but it is empty I am clearly being misunderstood in some wrong way.

By now I understand that the two main methods are the count of 1 section rows which are returning zero in my case, which I know is wrong! 

  - (NSInteger) tableView: (UITableView *) tableView numberOfRowsInSection: (NSInteger) section {// incomplete legal implementation #warning. // Return the number of rows in the section NSLog (@ "top place% @", manually top); // return 100; Return [self. Top place count]; }   
 The following method is never called because of the above because there are no rows  
  - (UITableViewCell *) tableView :. (UITableView *) tableView cellForRowAtIndexPath: (NSIndexPath *) indexPath   
 And the second is within the viewDidLoad, where I can enter your data for the console and gives everything looks fine. That is, my data is generated in viewdload  
  - (zero) viewDidoadload [[Super Viewedload]; Dispatch_queue_t dowloadQueue = dispatch_queue_create ("Flick Downloader", NULL); dispatch_async (dowloadQueue, ^ {NSArray * topPlaces = [FlickrFetcher topPlaces]; // array right here dispatch_async (dispatch_get_main_queue (), ^ {NSSortDescriptor * woeDescriptor is = [[; // NSLog (@, topPlaces) "array% @" NSSortDescriptor alloc] initWithKey:: @ "_ materials" ascending Yes]; NSArray * woeDescriptors = @ [woeDescriptor]; NSArray * sortedReturns = [topPlaces sortedArrayUsingDescriptors: woeDescriptors]; self.topPlaces = sortedReturns; // all data here, count 100 and the array will log in to NSLog to console (@ "here it is calculated% u", [self.topplaces count]);});}); // Repeat the following line to preserve selection among presentations. Self.clearSelectionOnViewWillAppear = No; }    
 
 
 The problem is that you make an asynchronous call to bring data (meaning That your array should be filled with data at some point in the future), but you will not reload your table view later: Calling  reload data  will:  
  ... self.topplaces = sortedReturns; // All the data are here, the calculation is 100 and the array will log on to NSLog in the console (@ "here it has been calculated% u", [top top counting]); [Self.tableViewReloadData]; The // Assuming that the table view, 'Your outlet   
 This will instruct to once again query your Detastro your Teblwu and eventually clear all your data (now)  Top Location  array  
  Further explanation:  
 I saw in the comment of @ nerak99 that she is absolutely sure why the problem < Not defined with the code> reloadData . Well, let's use an example:  
 Imagine that you have a restaurant  
 you open in the morning at 06:00 and you see that you want to cook Nothing is found. So you can ask one of your men to go to the market for supplies (this is your  asynchronous call ).  
 At the same time you instruct the waitress to write in today's menu, so she writes ... well, nothing (this is your  asking for the number of rows of table rows )  
 Now the man who returns to the market with 10 items is the next rational step to update his menu?  
 I hope this makes sense :)          P>

Comments

Post a Comment

Popular posts from this blog

Python SQLAlchemy：AttributeError: Neither 'Column' object nor 'Comparator' object has an attribute 'schema' -

I tried to create a new database in my project, but when I run the script, I get this error, I have another project, this type of definition worked before, but now it gets a single error. I am using Python 2.7.8 and the version of SQLAlchemy module is 0.9.8. By the way, using a project flask- SQLAlchemy, it works well, I'm confused. Traceback information is as follows: Traceback (most recent call final): File "D: / Projects / IOM / db_create.py", line 4, & lt; Module & gt; From the models the base file "D: \ Projects \ OO-IM \ models.py", in line 15, in the & lt; Module & gt; Column ( 'followed_id', int (), ForeignKey ( 'user.id')) file "C: \ Python27 \ lib \ site-packages \ SQLAlchemy \ SQL \ schema.py", line 369, __new__ schema = metadata. Schema file "C: \ Python27 \ lib \ site-packages \ SQLAlchemy \ SQL \ elements.py", line 662, AttributeError in __getattr__ key): Neither 'column' object nor ...
Read more

java - How not to audit a join table and related entities using Hibernate Envers? -

I use Eners to be hibernate to audit my institutions. I have an audit entity, Foo , which includes a list & lt; Bars & gt; However, I do not want to audit the bar institutions, in the form of properties, I have written that: @inti @edicated public class Foo {@JoinTable (name = "T_FOO_BAR", joinColumns = @JoinColumn (name = "FOO_ID"), inverseJoinColumns = @JoinColumn (Name = "BAR_ID")) @ManyToMany (Cascade = Persist) @ Indited (targetAuditMode = RelationTargetAuditMode.NOT_AUDITED ) Public listing & lt; Bars & gt; GetBars () {Return bars; }} Now, I want to retrieve an amendment of foo : AuditReader reader = AuditReaderFactory.get (GetEntityManager ()); FU modification = (FU) reader.CreativeTeA () .entensEtrevision (Foo Class, 42) .getSingleResult (); Unfortunately, when I want to retrieve all the data (i.e. when it loads lazy times ), error me ORA-00942: table or view is not present , because Tried to query this: Sel...
Read more

mongodb - CakePHP paginator ignoring order, but only for certain values -

While pagging my user model in kppp, I can sort with some values, but not others. For example, I can order results from created or email , for example, but username or reputation seems to come back order by arbitrary command for example with a list of users: $ this-> paginate = array ('condition' => array ( 'User.is_active' = & gt; true), 'border' => 24, 'order' => array ('User.created' => DESC)); Works as expected, but $ this - & gt; Paged = array ('conditions' = & gt; array (' user.isIactive '= & gt; true),' border '= & gt; 24,' command '= & gt; array (' user repeats' = ' & Gt; DESC ')); No, no. I first thought that this could be a database issue, but when I search the database directly, sorted as expected. Note: I am using Mangodebi with the Mongo DB plugin of Ichikawa for the KPPHP; Pagnetizing users are used to work properl...
Read more