Question

我正在使用NSUrlConnection转到.ashx文件来执行MYSQL语句并返回结果。然后把它放在一张桌子里。

在这个特别的一个我得到分类，这一切都正常工作并得到它应该的细节，但在connectionDidFinishLoading函数之后没有其他事情发生。

我把断点放在它后面的任何地方，但没有任何反应只是在它进入表格之前结束。

以下是我的代码，如果您需要我错过的任何信息，请询问。

.h文件

    #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文件

            #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

问题是NSURLConnection将异步工作。因此，当您获取数据时，您的tableview将已填充没有数据。所以你需要重新加载你的tableview，只需将下面的代码添加为connectionDidFinishLoading:的最后一行

[Category_Table reloadData];

在connectionDidFinishLoading之后其他功能不运行？

1 个答案: