I am trying to populate the TableViewCells in my TableViewContoller with an Array of data that is being pulled from a JSON object. NSJSONSerialization is simply not getting called.
I've tried a variety of things using DataTaskWithURL. Sadly I'm coming up empty with 0 items found in the array. Thanks in advance for anyone's help!
#property NSArray *toothpastes;
#end
#implementation ToothpastChoicesTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSString *urlString = #"https://s3.amazonaws.com/mmios8week/toothpastes.json";
NSURLSession *session = [NSURLSession sharedSession];
[session dataTaskWithURL:[NSURL URLWithString:urlString] completionHandler:^
(NSData *data,
NSURLResponse *response,
NSError *error) {
if (error) {
NSLog(#"%#", error);
} else {
self.toothpastes = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
[self.tableView reloadData]; }
}];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSLog(#"%lu", (unsigned long)self.toothpastes.count);
return self.toothpastes.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CellID" forIndexPath:indexPath];
cell.textLabel.text = self.toothpastes[indexPath.row];
return cell;
}
You forgot to resume the task
NSURLSessionDataTask *task = [session dataTaskWithURL:[NSURL URLWithString:urlString] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (error) {
NSLog(#"%#", error);
} else {
self.toothpastes = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
[self.tableView reloadData];
}
}];
[task resume];
Related
i've been trying to get a segue to work. I've written the following... but for some reason, the ...preparesegue... method doesnt fire. I've read other related posts but i cant get it to fire, and just as importantly, the variable i'm need isnt transferred.
m file:
#implementation CountryTableViewController
-(void) getData:(NSData *) data {
NSError *error;
json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
[self.tableView reloadData];
}
-(void) start {
NSURL *url = [NSURL URLWithString: URL];
NSData *data = [NSData dataWithContentsOfURL:url];
[self getData:data];
}
- (void)viewDidLoad {
[super viewDidLoad];
[self start];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#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 [json count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellId = #"CellIdentifier";
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
if (!cell) {
cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellId];
}
NSDictionary *info = [json objectAtIndex:indexPath.row];
cell.TitleLabel.text = [info objectForKey:#"CountryName"];
cell.ReferenceLabel.text = [info objectForKey:#"id"];
return cell;
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender tableView:(UITableView *)tableView {
//if ([segue.identifier isEqualToString:#"CountryToState"]) {
NSLog(#"TEST");
NSIndexPath *path = [self.tableView indexPathForSelectedRow];
TableViewCell *cell = (TableViewCell *)[tableView cellForRowAtIndexPath:path];
NSString *countryRef = [[cell ReferenceLabel] text];
TableViewControllerStates *TVCS = [segue destinationViewController];
TVCS.receivedReferenceNumber = countryRef;
//}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//TableViewCell *cell = (TableViewCell *)[tableView cellForRowAtIndexPath:indexPath];
//NSString *countryRefNumber = [[cell ReferenceLabel] text];
[self performSegueWithIdentifier:#"CountryToState" sender:tableView];
}
h file
#import <UIKit/UIKit.h>
#define URL #"http://localhost/Rs.php"
#interface CountryTableViewController : UITableViewController <UITableViewDelegate, UITableViewDataSource> {
NSMutableArray *json;
}
Any help appreciated; thank you in advance.
i have some problem with NSMutablearray and JSON parse.
So what i doing? A make parse from JSON and send to my TableViewCell.
I have my code:
h:
{
NSMutableData *webdata;
NSURLConnection *connection;
NSMutableArray *array;
NSMutableArray *array2;
NSTimer *timer;
}
m:
{
[super ViewDidload]
[[self tableTrack] setDelegate:self];
[[self tableTrack] setDataSource:self];
array = [[NSMutableArray alloc] init];
array2 = [[NSMutableArray alloc] init];
timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:#selector(plistGet) userInfo:nil repeats:YES];
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[webdata setLength:0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[webdata appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"error load");
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSDictionary *allDataDictionary = [NSJSONSerialization JSONObjectWithData:webdata options:0 error:nil];
NSDictionary *playlist =[allDataDictionary objectForKey:#"playlist"];
for (NSDictionary *diction in playlist) {
NSDictionary *artist = [diction objectForKey:#"artist"];
NSDictionary *song = [diction objectForKey:#"song"];
NSString *name = [artist objectForKey:#"name"];
NSString *namesong = [song objectForKey:#"name"];
[array addObject:name];
[array2 addObject:namesong];
}
[[self tableTrack]reloadData];
}
-(void)plistGet {
[array removeAllObjects];
[array2 removeAllObjects];
NSURL *url = [NSURL URLWithString:#"http://plist.json"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
connection = [NSURLConnection connectionWithRequest:request delegate:self];
if (connection) {
webdata = [[NSMutableData alloc]init];
}
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [array count];
// return [array2 count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(! cell)
{
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]autorelease];
}
cell.textLabel.text = [array2 objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [array objectAtIndex:indexPath.row];
cell.textLabel.textColor = [UIColor colorWithRed:(50/255.0) green:(200/255.0) blue:(255/255.0) alpha:1];
[tableTrack setBackgroundView:nil];
tableTrack.backgroundColor = [UIColor clearColor];
cell.detailTextLabel.font=[UIFont fontWithName: #"Helvetica" size:11];
UIFont *myFont = [ UIFont fontWithName: #"Arial" size: 9.0 ];
cell.textLabel.font = myFont;
self.tableTrack.separatorStyle = UITableViewCellSeparatorStyleNone;
UIView *separatorView = [[UIView alloc] initWithFrame:CGRectMake(0, 43, 1024, 1)];
separatorView.layer.borderColor = [UIColor darkGrayColor].CGColor;
separatorView.layer.borderWidth = 0.5;
[cell.contentView addSubview:separatorView];
return cell;
}
All work very good but after 5 or 3 minutes i have error and my app crashed.
Error:
2013-06-21 12:32:41.502 EuropaPlusUA[651:707] * Terminating app due to uncaught exception 'NSRangeException', reason: '* -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
* First throw call stack:
(0x353f188f 0x37798259 0x3533a9db 0xfa9d5 0x32e85efb 0x32e84fd9 0x32e84763 0x32e28f37 0x353501fb 0x32220aa5 0x322206bd 0x32224843 0x3222457f 0x3221c4b9 0x353c5b1b 0x353c3d57 0x353c40b1 0x353474a5 0x3534736d 0x36fe3439 0x32e53cd5 0xf8843 0xf87d0)
terminate called throwing an exception
What is it? Help please.
Your problem is that you probably do another plistget method after that 3-5 minutes. That method will throw away all objects from your array. During the time your data is getting loaded and the time you cleared your array, the table datasource is empty, however you are trying to get this object from index 0. This is why your crash happens.
The solution however is simple. Do not call the removeAllObjects method at all.
Simply replace the array with the contents that you will retrieve.
Replace mechanic that you will need to do the moment you get the data from your server:
NSMutableArray *tempDataArray = [[NSMutableArray alloc] init];
//put retrieved data from your web call in the tempDataArray
array = tempDataArray;
me thinks the only objectAtIndex is here.
cell.detailTextLabel.text = [array objectAtIndex:indexPath.row];
seems likely array was emptied by plistget
[array removeAllObjects];
Totumus Maximus is right.
If you just need to bridge the gap between getting clearing the arrays and reloading the data why not try NOT deleting them until the new data is ready? Then just replace them
Alternatively make a copy of them first (say to backUpArray and backUpArray2) and then check to see if you have data in array/array2 (something like if([array count]) or if (array) {...) before you try and load the cell.
If you have nothing in the arrays use [backUpArray lastObject] to give you some data for the (brief ?) time until the arrays are reloaded.
i have problem.
I have CityViewController.m
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
TheatreController *tmpTheatreController = [storyboard instantiateViewControllerWithIdentifier:#"TheatreController"];
NSString *cityView = [[self.arrayCity objectAtIndex:indexPath.row] valueForKey:#"idCity"];
tmpTheatreController.cityView = cityView;
//[self.navigationController pushViewController:tmpTheatreController animated:YES];
[tmpTheatreController.tableView reloadData];
[self.delegate citiesViewControllerCancel:self];
}
When i select the city pass correctly the "idCity" in TheatreController.m
...
-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:#"SelectCity"])
{
UINavigationController *nc = segue.destinationViewController;
CityViewController *mvc = [[nc viewControllers] objectAtIndex:0];
mvc.delegate = self;
}
}
...
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *webUrl = #"http://localhost:3000/theatres?city=";
webUrl = [webUrl stringByAppendingFormat:#"%#", cityView];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:webUrl]];
[self performSelectorOnMainThread:#selector(fetchedData:)
withObject:data waitUntilDone:YES]; });
}
- (void)fetchedData:(NSData *)responseData {
NSArray* json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions error:nil];
NSMutableArray *theatreTMP = [[NSMutableArray alloc] initWithCapacity:[json count]];
int i = 0;
for (id object in [json valueForKeyPath:#"response.name"]) {
Theatres *t = [[Theatres alloc] init];
NSLog(#"JSON: %#", [[json valueForKeyPath:#"response.name"] objectAtIndex:i]);
t.theatre = [[json valueForKeyPath:#"response.name"] objectAtIndex:i];
t.idTheatre = [[json valueForKeyPath:#"response.id"] objectAtIndex:i];
[theatreTMP addObject:t];
i++;
}
self.arrayTheatre = [theatreTMP copy];
[self.tableView reloadData];
}
I have correctly the response of the server and all parameter are correct, but the problem i have with reloadData of the tableView main![enter image description here][1]. I dont see the update table.
HELP ME thanks
i have resolved with this solution
In the CityViewController.m
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *cityView = [[self.arrayCity objectAtIndex:indexPath.row] valueForKey:#"idCity"];
[self.delegate performSelector:#selector(reloadTable:) withObject:cityView];
[self.delegate citiesViewControllerCancel:self];
}
and in the TheatreTableView.m
- (void) callServer:(NSString *)idCity {
NSString *webUrl = #"http://localhost:3000/theatres?city=";
webUrl = [webUrl stringByAppendingFormat:#"%#", idCity];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:webUrl]];
[self performSelectorOnMainThread:#selector(fetchedData:) withObject:data waitUntilDone:YES];});
}
....
- (void) reloadTable:(id)idCity
{
[self callServer:idCity];
}
Thanks
I'm a beginner on xcode and I have very little knowledge about it. Here is my code. I'm doing a simple account management program for iOS 6.0. I need to select the row from where i'm going to edit/delete my data from the table view and then be able to update/delete it. I don't know how to code those and I need help from experienced programmers.
My project: http://www.mediafire.com/?95l8pwzu3c62ts0
#import "FlipsideViewController.h"
#interface FlipsideViewController ()
#end
#implementation FlipsideViewController
#synthesize entries;
- (void)viewDidLoad
{
self.label.text=self.strUsername;
entries = [[NSMutableArray alloc]init];
[self openDB];
NSString *sql = [NSString stringWithFormat:#"SELECT * FROM SUMMARY8 WHERE theuser = '%s'",[self.label.text UTF8String]];
sqlite3_stmt *statement;
if (sqlite3_prepare(account, [sql UTF8String], -1, &statement, nil)==SQLITE_OK)
{
while (sqlite3_step(statement)==SQLITE_ROW){
char *field1=(char *) sqlite3_column_text(statement, 0 );
NSString *field1Str = [[NSString alloc]initWithUTF8String:field1];
char *field2=(char *) sqlite3_column_text(statement, 1 );
NSString *field2Str = [[NSString alloc]initWithUTF8String:field2];
char *field3=(char *) sqlite3_column_text(statement, 2 );
NSString *field3Str = [[NSString alloc]initWithUTF8String:field3];
char *field4=(char *) sqlite3_column_text(statement, 3 );
NSString *field4Str = [[NSString alloc]initWithUTF8String:field4];
NSString *str = [[NSString alloc]initWithFormat:#"%# - %# - %#", field1Str,field3Str,field4Str];
[entries addObject:str];
}
}
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(NSString *) filePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [[paths objectAtIndex:0]stringByAppendingPathComponent:#"account.sql"];
}
-(void) openDB
{
if (sqlite3_open([[self filePath] UTF8String], &account) !=SQLITE_OK){
sqlite3_close(account);
NSAssert(0,#"Database failed to open");
}
else
{
NSLog(#"database opened");
}
}
- (IBAction)addaccount:(id)sender {
MainViewController *FVC = [self.storyboard instantiateViewControllerWithIdentifier:#"MainViewController"];
FVC.strUsername=self.strUsername;
[self presentViewController:FVC animated:YES completion:nil];
// FVC.label.text=self.label.text;
}
- (IBAction)btnEdit:(id)sender {
}
- (IBAction)btnDelete:(id)sender {
[self tableView:<#(UITableView *)#> cellForRowAtIndexPath:<#(NSIndexPath *)#>];
}
#pragma mark - Actions
- (IBAction)done:(id)sender
{
[self.delegate flipsideViewControllerDidFinish:self];
}
-(NSInteger) numberOfSectionsInTableView: (UITableView *)tableView
{
return 1;
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
NSString *myTitle = [[NSString alloc]initWithFormat:#"Name - Username - Password"];
return myTitle;
}
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSLog(#"%d", [entries count]);
return [entries count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{//NSLog(#"test");
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
cell.textLabel.text = [self.entries objectAtIndex:indexPath.row];
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
NSString *selectedRow = [entries objectAtIndex:indexPath.row];
NSString *sql = [NSString stringWithFormat:#"DELETE FROM SUMMARY8 WHERE name = '%#'",selectedRow];
char *err;
if (sqlite3_exec(account, [sql UTF8String], NULL, NULL, &err)!=SQLITE_OK){
sqlite3_close(account);
NSAssert(0, #"Could not delete row");
}
else {
NSLog(#"row deleted");
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Done" message:#"Account was deleted successfully!" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
}
}
#end
is this correct? sorry I absolutely have no background on Xcode. So sorry for the bother..
Delete use this:
Example:strUpdate = [NSString stringWithFormat:#"DELETE FROM SUMMARY8 WHERE theuser = '%s'",[self.label.text UTF8String]];
Update use this:
Example(updating the status):strQuery = [NSString stringWithFormat:#"UPDATE SUMMARY8 SET STATUS='1' WHERE theuser = '%s'",[self.label.text UTF8String]];
Hope this helps.
EDIT:
use this method:
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
Example: NSString *selectedRow = [entries objectAtIndex:indexPath.row];
}
This method basically shows the data for that row of table. manipulate with that data. Given examples.. Tweak it according to your situation...
EDIT 2:
For example:
UITableView *table = [[UITableView alloc] init];
[self tableView:table didSelectRowAtIndexPath:index];
where index is your item number.
I am trying to propagate a table view with a custom cell with the results of a TWRequest with no luck. I am trying to store the tweets in a dictionary object then calling an ObjectAtKey request and putting into a string. Here is my code - any help would be appreciated. Thanks -
-(void)fetchTweets
{
// Do a simple search, using the Twitter API
TWRequest *request = [[TWRequest alloc] initWithURL:[NSURL URLWithString:
#"http://search.twitter.com/search.json?q=iOS%205&rpp=5&with_twitter_user_id=true&result_type=recent"]
parameters:nil requestMethod:TWRequestMethodGET];
// Notice this is a block, it is the handler to process the response
[request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error)
{
if ([urlResponse statusCode] == 200)
{
// The response from Twitter is in JSON format
// Move the response into a dictionary and print
NSError *error;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error];
NSLog(#"Twitter response: %#", dict);
}
else
NSLog(#"Twitter error, HTTP response: %i", [urlResponse statusCode]);
}];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return tweets.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"cell";
CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NSString *tweetText = [dict objectForKey:#"text"];
NSArray *tweetComponents = [tweetText componentsSeparatedByString:#":"];
cell.Header.text = [tweetComponents objectAtIndex:0];
cell.Details.text = [tweetComponents objectAtIndex:1];
cell.Date.text = [tweetComponents objectAtIndex:2];
return cell;
}
You will need to create an NSMutableArray of the tweets from the Twitter response.
Each tweet being a separate object.
NSMutableArray *resultArray = [[NSMutableArray] alloc] init];
for (NSDictionary *tweet in dict)
{
[resultArray addObject:tweet];
}
Then in cellForRowAtIndexPath retrieve the object based on the row of the table, something like
TweetResult *tweetResult [resultArray objectAtIndex:[indexPath row]];