连接DidFinishLoading后，其他功能无法运行？

Question

I am using NSUrlConnection to go to a .ashx file to do a MYSQL Statement and return the result. Then put it in a table.

In this particular one i am getting Categories, which is all working fine and getting the details it should but after the connectionDidFinishLoading function nothing else happens.

I put breakpoints in everywhere after it and in it but nothing happens it just ends before it goes to the table entering.

Below is my code and if you need any information i have missed out, please ask.

.h file

    #import <UIKit/UIKit.h>

    @interface Category_TableView : UIViewController <NSURLConnectionDelegate>
    {
        sqlite3 *database;
    }
    @property (retain, nonatomic) NSMutableArray *Category_Array;
    @property (strong, nonatomic) IBOutlet UITableView *Category_Table;
    @property (retain, nonatomic) NSString *type;
    @property (retain, nonatomic) NSString *Category;


    @property (retain, nonatomic) NSMutableData *CatData;

    @end

.m file

            #import "Category_TableView.h"
            #import "Cateogry_Cell.h"
            #import "JobList_Table.h"
            #import "JobList_Cell.h"
            #import <QuartzCore/QuartzCore.h>

            @interface Category_TableView ()

            @end

            @implementation Category_TableView

            - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
            {
                self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
                if (self) {
                    // Custom initialization


                }
                return self;
            }

            - (void)viewDidLoad
            {
                [super viewDidLoad];
                self.navigationController.navigationBar.hidden = YES;
                // Do any additional setup after loading the view.

                NSString *requestURL = [NSString stringWithFormat:@"http://"URL"/forms/AppForms/app_latest.ashx"];
                NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString: requestURL]];
                NSURLConnection *con =[[NSURLConnection alloc] initWithRequest:request delegate:self];

                if(con)
                {
                    self.CatData = [[NSMutableData alloc] init];
                    self.Category_Array = [[NSMutableArray alloc] init];
                }
                else
                {
                    [[[UIAlertView alloc] initWithTitle:@"Error" message:@"Failed to get connection. Please try again later" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil] show];
                }

            }
            - (void)didReceiveMemoryWarning
            {
                [super didReceiveMemoryWarning];
                // Dispose of any resources that can be recreated.
            }
            - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
            {
                [self.CatData setLength:0];
            }

            - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
            {
                [self.CatData appendData:data];
            }
            - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
            {

                [[[UIAlertView alloc] initWithTitle:@"Error" message:@"Failed to get connection. Please try again later"  delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil] show];


            }
            - (void)connectionDidFinishLoading:(NSURLConnection *)connection
            {
                NSString *temp = [[NSString alloc] initWithData:self.CatData encoding:NSUTF8StringEncoding];
                NSArray *jobs = [temp componentsSeparatedByString:@"||||"];
                NSMutableDictionary *temp_dict = [[NSMutableDictionary alloc] init];
                NSArray *jobInfo = [[NSArray alloc] init];
                int count = 0;
                for(int i = 1; i < [jobs count]; i++)
                {
                    jobInfo = [[jobs objectAtIndex:i] componentsSeparatedByString:@"||"];
                    @try {

                        temp_dict = [[NSMutableDictionary alloc]init];
                        [temp_dict setObject:[jobInfo objectAtIndex:0] forKey:@"Category"];
                        [self.Category_Array addObject:temp_dict];
                        count++;
                    }
                    @catch (NSException *exception) {

                        [[[UIAlertView alloc] initWithTitle:@"Exception Thrown" message:exception.reason delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil] show];
                    }
                }
            }


            //#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.
                return [self.Category_Array count];
            }


            - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
            {
                static NSString *CellIdentifier = @"Cateogry_Cell";
                Cateogry_Cell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                // Configure the cell...


                [[[UIAlertView alloc] initWithTitle:@"In Table Function" message:@"Failed to try again later" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil] show];

                if(cell == nil) {
                    cell = [[Cateogry_Cell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cateogry_Cell"];
                }

                NSDictionary *temp = [self.Category_Array objectAtIndex:[indexPath row]];
                cell.Category_Cell_Label.text = [temp objectForKey:@"Category"];

                return cell;
            }

            -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
            {
                if ([[segue identifier] isEqualToString:@"Cat_Cell_Push"])
                {
                    JobList_Table *DetailController = [segue destinationViewController];
                    NSIndexPath *MyIndexPath = [_Category_Table indexPathForSelectedRow];
                    int row = [MyIndexPath row];
                    DetailController.JobList_Array = @[_Category_Array[row]];


                }
            }

            @end

Answer 1

Issue is the NSURLConnection will work asynchronously. So when you get the data your tableview will be already populated with no data. So you need to reload your tableview, just add the folowing code as the last line of connectionDidFinishLoading:

[Category_Table reloadData];