如何用JSON数组中的数据填充UITableView？

Question

I have been trying to populate my tableView for the pas 4 days and I keep hitting dead ends.

I have been through the questions on here and tried some of the suggestions that others have been given, but none of them seem to work. Basically I have JSON data sent from my website and that is populating an array that I then wish to put into a tableView.

The NSLog is returning all correct info, but seems to stop once the array is created, and doesn't have any data logging after the array populates.

here is my .h file

//
//  reportsTestViewController.h
//  TESG-iConnect
//
//  Created by TESG on 7/03/14.
//  Copyright (c) 2014 TESG. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface reportsTestViewController : UIViewController  <UITableViewDelegate, UITableViewDataSource>{

    IBOutlet UITableView *reportsTable;

    NSString *response;
    NSMutableArray *reportsArray;

}

@property (nonatomic, retain) NSString *response;

@property (nonatomic, strong) NSMutableData *myDataIvar;



@end

and my .m file

//
//  reportsTestViewController.m
//  TESG-iConnect
//
//  Created by TESG on 7/03/14.
//  Copyright (c) 2014 TESG. All rights reserved.
//

#import "reportsTestViewController.h"
#import "ReportsDataObject.h"

@interface reportsTestViewController ()

@end

@implementation reportsTestViewController

@synthesize response;

@synthesize myDataIvar;

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

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

#pragma mark NSURLConnection Delegate Methods
//    

    //Create your request pointing to the test page
   NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.tesg.com.au/allCustBuild.php"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0];


    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    //initialize it when you create your connection
    if (connection){
        self.myDataIvar = [[NSMutableData alloc] init];
    }
}

    -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
        [self.myDataIvar setLength:0];
    }

    -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
        [self.myDataIvar appendData:data];
        [reportsTable reloadData];
    }

    -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
        NSLog(@"Connection Failed: %@", error.userInfo);
    }

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    //this is where you would parse the data received back from the server
    NSString *responseString = [[NSString alloc] initWithData:self.myDataIvar encoding:NSUTF8StringEncoding];
    NSLog(@"Received Data: %@",responseString);
    [self setupReportsFromJSONArray:self.myDataIvar];

}

-(void)connectionWasASuccess:(NSData *)data{
    [self setupReportsFromJSONArray:data];
}



-(void)setupReportsFromJSONArray:(NSData*)dataFromReportsArray{
    NSError *error;
   // NSMutableArray *reportsArray = [[NSMutableArray alloc] init];
    NSArray *arrayFromServer = [NSJSONSerialization JSONObjectWithData:dataFromReportsArray options:0 error:&error];

    if(error){
        NSLog(@"error parsing the json data from server with error description - %@", [error localizedDescription]);
    }
    else {
        reportsArray = [[NSMutableArray alloc] init];
        for(NSDictionary *eachReport in arrayFromServer)
        {
            ReportsDataObject *report = [[ReportsDataObject alloc] initWithJSONData:eachReport];
            [reportsArray addObject:report];
        }
        NSLog(@"Array Populated");
        NSLog(@"%u reports found",reportsArray.count);
        //Now you have your reportsArray filled up with all your data objects
    }
}


-(void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    //We check against table to make sure we are displaying the right number of cells
    // for the appropriate table. This is so that things will work even if one day you
    //decide that you want to have two tables instead of one.
//    if(tableView == reportsTable)
    {
        return([reportsArray count]);
    }
    return 0;
    NSLog(@"%u",reportsArray.count);
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *reportsTableIdentifier = @"ReportsTableCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reportsTableIdentifier];
    if(cell)
    {
        //set your configuration of your cell
    }
    //The beauty of this is that you have all your data in one object and grab WHATEVER you like
    //This way in the future you can add another field without doing much.

    if([reportsArray count] == 0){
        cell.textLabel.text = @"no reports to show";
    }
    else{
        ReportsDataObject *currentReport = [reportsArray objectAtIndex:indexPath.row];
        cell.textLabel.text = [currentReport reportName];
        // in the future you can grab whatever data you need like this
        //[currentReport buildingName], or [currentReport reportName];
    }
    return(cell);
}

@end

and my NSLog output

2014-03-11 14:40:13.006 TESG-iConnect[29384:a0b] PostData: username=&password= 2014-03-11 14:40:13.119 TESG-iConnect[29384:a0b] Response code: 200 2014-03-11 14:40:13.119 TESG-iConnect[29384:a0b] Response ==> {"success":1} 2014-03-11 14:40:13.120 TESG-iConnect[29384:a0b] Success: 1 2014-03-11 14:40:13.120 TESG-iConnect[29384:a0b] Login SUCCESS 2014-03-11 14:40:14.677 TESG-iConnect[29384:a0b] Received Data: [{"id":"7684","title":"POT Feb 2011","date":"2011-04-18 10:49:27","link":"1303087767_POT 113 Lonsdale St feb11.pdf"},{"id":"7683","title":"Audit Feb 2011","date":"2011-04-18 10:49:12","link":"1303087751_CA 113 Lonsdale St feb 11.pdf"},{"id":"11189","title":"AESMR 2011","date":"2012-01-30 09:49:28","link":"1327877368_AESMR 113 Lonsdale Street, Melbourne 2011.pdf"},{"id":"8761","title":"Annual 2011","date":"2011-08-02 12:55:56","link":"1312253756_Annual Passive 113 Lonsdale St May 2011.pdf"},{"id":"8762","title":"Audit May 2011","date":"2011-08-02 12:56:16","link":"1312253775_CA 113 Lo nsdale Street May 11.pdf"},{"id":"8763","title":"POT May 2011","date":"2011-08-02 12:56:34","link":"1312253794_POT 113 Lonsdale Street May 2011.pdf"},{"id":"10286","title":"Audit Aug 2011","date":"2011-11-08 14:31:34","link":"1320723094_CA 113 Lonsdale Street Aug 11.pdf"},{"id":"10287","title":"POT Aug 2011","date":"2011-11-08 14:31:46","link":"1320723106_POT 113 Lonsdale Street Aug 2011.pdf"}] 2014-03-11 14:40:14.678 TESG-iConnect[29384:a0b] Array Populated 2014-03-11 14:40:14.678 TESG-iConnect[29384:a0b] 8 reports found

I cannot seem to find where the code is not working. can someone point me in the right direction please??

EDIT TO INCLUDE dataObject JUST IN CASE

//
//  ReportsDataObject.h
//  TESG-iConnect
//
//  Created by TESG on 7/03/14.
//  Copyright (c) 2014 TESG. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface ReportsDataObject : NSObject

-(id)initWithJSONData:(NSDictionary*)data;

@property (assign) NSInteger reportId;
@property (strong) NSString *buildingName;
@property (strong) NSString *reportName;
@property (strong) NSString *reportDate;
@property (strong) NSString *reportLink;

@end

---

//
//  ReportsDataObject.m
//  TESG-iConnect
//
//  Created by TESG on 7/03/14.
//  Copyright (c) 2014 TESG. All rights reserved.
//

#import "ReportsDataObject.h"

@implementation ReportsDataObject

@synthesize reportId;
@synthesize buildingName;
@synthesize reportName;
@synthesize reportDate;
@synthesize reportLink;

-(id)initWithJSONData:(NSDictionary*)data{
    self = [super init];
    if(self){
        //NSLog(@"initWithJSONData method called");
        self.reportId = [[data objectForKey:@"id"] integerValue];
        self.buildingName =  [data objectForKey:@"buildingname"];
        self.reportName = [data objectForKey:@"reportname"];
        self.reportDate = [data objectForKey:@"reportdate"];
        self.reportLink = [data objectForKey:@"reportlink"];

    }
    return self;
}

@end

Answer 1

You haven't initialised your uitableviewcell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *cellIdentifier = @"Cell";

    UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (!cell)
    {


        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];

    }

Answer 2

我认为您需要在setupReportsFromJSONArray方法的末尾而不是在didReceiveResponse中调用reloadData，因为您直到那时才创建reportsArray。