TWRequest from a dictionary in a tableView Cell - xcode

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]];

Related

Retrieve Image for different Class Data browser Parse.com

Hello everyone I'm trying to display the profile picture of a user registered with the app.
In this query I am getting data from a different class from wherever it is in the photo databrowser. I tried with MatchesQuery but I can not find the right combination ... Probably my code is wrong ...
- (void)QueryForTableView {
PFQuery *QueryForFriend=[PFQuery queryWithClassName:#"Amicizie"];
[QueryForFriend whereKey:#"A_User" equalTo:[PFUser currentUser]];
[QueryForFriend includeKey:#"Da_User"];
PFQuery *RetrievePhoto_User = [PFUser query];
[RetrievePhoto_User whereKey:#"photo" matchesQuery:QueryForFriend];
[QueryForFriend findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
NSLog(#"nome:%#", objects);
self.UtentiInAttesa = objects ;
[self.FFTableView reloadData];
}
}];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"CellaAmici";
FFCustomCellFriendInAttesa *cell = [self.FFTableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (!cell) {
cell = [[FFCustomCellFriendInAttesa alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"CellaAmici"];
}
PFUser *FriendUser = [self.UtentiInAttesa objectAtIndex:indexPath.row];
NSString *ValueNomeCognome = [[FriendUser objectForKey:#"Da_User"] valueForKey:FF_USER_NOMECOGNOME];
cell.FFNomeFriendLabel.text = ValueNomeCognome;
cell.FFFotoProfiloInAttesa.file = [FriendUser objectForKey:#"photo"];
cell.FFFotoProfiloInAttesa.image = [UIImage imageNamed:#"FFNoFotoUSer"];
[cell.FFFotoProfiloInAttesa.layer setMasksToBounds:YES];
[cell.FFFotoProfiloInAttesa.layer setCornerRadius:22.5f];
[cell.FFFotoProfiloInAttesa loadInBackground];
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After a little chat with you. The following code is unnecessary and wrong. So simple remove it and you are set:
PFQuery *RetrievePhoto_User = [PFUser query];
[RetrievePhoto_User whereKey:#"photo" matchesQuery:QueryForFriend];

NSMutableArray have error empty array

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.

Getting reddit feed as JSON and parsing it

I'm trying to parse JSON feed from reddit.com and then display it in a tableview. The JSON looks like this:
{
kind: Listing
data: {
modhash: 3lmt2d4hq6797af804da91bde566bd067ddee68e1e7f8e0dda
children: [
{
kind: t3
data: {
domain: imgur.com
banned_by: null
media_embed: { }
subreddit: funny
selftext_html: null
selftext:
likes: null
link_flair_text: null
id: 16e9so
clicked: false
title: I left my dog unattended with the 2 year old...
num_comments: 166
score: 2213
approved_by: null
over_18: false
hidden: false
thumbnail: http://c.thumbs.redditmedia.com/DaoiOlvtdjaPBG3n.jpg
subreddit_id: t5_2qh33
edited: false
link_flair_css_class: null
author_flair_css_class: null
downs: 2481
saved: false
is_self: false
permalink: /r/funny/comments/16e9so/i_left_my_dog_unattended_with_the_2_year_old/
name: t3_16e9so
created: 1357963292
url: http://imgur.com/zGMxP
author_flair_text: null
author: ShaneNickerson
created_utc: 1357934492
media: null
num_reports: null
ups: 4694
}
...more items here
}
And here's my tableview controller code:
#import "mainRedditFunViewController.h"
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
#define kjsonURL [NSURL URLWithString: #"http://reddit.com/r/funny/.json"
#interface mainRedditFunViewController ()
#end
#implementation mainRedditFunViewController
- (void)viewDidLoad
{
[super viewDidLoad];
dispatch_async(kBgQueue, ^{
NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://reddit.com/r/funny/.json"]];
[self performSelectorOnMainThread:#selector(fetchedData:)
withObject:data waitUntilDone:YES];
});
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] ;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
NSDictionary *appsdict = [jsonResults objectAtIndex:indexPath.row];
NSString *VersionString = [appsdict objectForKey:#"url"];
NSString *priceString = [appsdict objectForKey:#"author"];
NSURL *imageURL = [NSURL URLWithString:[appsdict objectForKey:#"thumbnail"]];
NSData *imageData = [NSData dataWithContentsOfURL:imageURL];
UIImage *imageLoad = [[UIImage alloc] initWithData:imageData];
cell.textLabel.text = [appsdict objectForKey:#"title"];
cell.detailTextLabel.text = [NSString stringWithFormat:#"URL: %# Author: $ %# USD",VersionString,priceString];
cell.imageView.image = imageLoad;
return cell;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [jsonResults count];
}
- (void)fetchedData:(NSData *)responseData {
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
jsonResults = [json objectForKey:#"data.children"];
[self.tableView reloadData];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
However, the output is completly empty. Is there anyway I could fix it? I tried it before with another (smaller) feed and it worked fine. I'm sure if I'm doing the JSONPath formatting correctly, since I'd look like that:
-kind
->data
->children
->data (my items)
->data
->data
...
I'd appreciate any help I get!
Im sorry that this answer is late! hope that it is still needed...
I have altered your code a little bit to access the sub levels of the returned Json results.
You certainly have the right Idea but just need a few more dictionaries in your fetchedData method. If you add these dictionaries in you method underneath your NSJSONSerialization;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:data
options:kNilOptions
error:&error];
//NSArray *Fullarray = [[NSArray alloc] initWithObjects:json, nil];
_jsonResult = [[NSMutableArray alloc] init];
NSDictionary *dataDict = [json objectForKey:#"data"];
NSDictionary *chilrenDict = [dataDict objectForKey:#"children"];
for (NSDictionary *informationFromChild in chilrenDict) {
NSLog(#"chil %#", chilrenDict);
[_jsonResult addObject:chilrenDict];
}
Then in your tableView cellForRow change your appsDict to this
NSDictionary *appsdict = [[_jsonResult objectAtIndex:indexPath.row] objectForKey:#"data"];
That should fix up the code and populate the tableView...
You can run a check on this too by checking
NSLog(#"count %i", [_jsonResult count]);
Let me know if this has been of help, happy coding. T

Custom cells - how can I separate out tweets into componentsseparatedbyString

I have a custom cell in a tableview. All connections are made. I am conducting a Twitter search. The results of this propagate a custom cell in a tableView. I would like to separate the individual tweets out into an array using componentsseparatedbystring so that I can assign these to 4 labels in my custom cell. Any help would be greatly appreciated. Here is my code.
- (void)fetchTweets
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData* data = [NSData dataWithContentsOfURL:
[NSURL URLWithString: #"https://api.twitter.com/1/statuses/public_timeline.json"]];
NSError* error;
tweets = [NSJSONSerialization JSONObjectWithData:data
options:kNilOptions
error:&error];
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
});
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return tweets.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"TweetCell";
customCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
// added this bit in
cell = [[customCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// THIS IS THE BIT I'M STRUGGLING WITH
// I'M GUESSING THAT THIS LINE SEPARATES THE TWEETS INTO SINGLE TWEETS?
NSDictionary *tweet = [tweets objectAtIndex:indexPath.row];
// I THEN CREATE AN ARRAY TO HOLD MY COMPONENTS OF THE TWEET SO THAT I CAN SPLIT FOR MY LABELS
NSArray *arrayForCustomCell = [[NSArray alloc] init];
arrayForCustomCell = [tweet componentsSeparatedByString:#":"];
return cell;
}
You have already parsed the results in your async call. Now, you have an array of 'tweet' dictionaries and you can grab any value like this:
NSDictionary *tweet = [tweets objectAtIndex:indexPath.row];
NSString *tweetText = [tweet valueForKey:#"text"];
NSString *tweetCountry = [tweet valueForKeyPath:#"place.country"] //Nested property
and then you just set your UILabels. You get the idea...

iPhone UITableViewCell slow performance

I just wrote a small application that read from a site feed and display in UITableViewCell. I am using custom view cell and my UITableView is screwed in scrolling like it is not very smooth in scrolling upside down. Any idea? Here's the code for my UITableViewCell,
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"CustomCell";
CustomCell *cell = (CustomCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
// cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"CustomCell" owner:nil options:nil];
for(id currentObject in topLevelObjects) {
if([currentObject isKindOfClass:[UITableViewCell class]]) {
cell = (CustomCell *) currentObject;
break;
}
}
}
//MiceAppDelegate *AppDelegate = (MiceAppDelegate *)[[UIApplication sharedApplication] delegate];
if(dataArray != nil) {
//
//NSArray *promoArray = (NSArray *) promotions;
NSDictionary *datadict = [self.dataArray objectAtIndex:indexPath.row];
NSString *url = [datadict objectForKey:#"imageUrl"];
NSString *title = [datadict objectForKey:#"title"];
NSString *description = [datadict objectForKey:#"description"];
NSString *newAddressPartOfURL = [url stringByReplacingOccurrencesOfString:#" " withString:#"+"];
//NSLog([url stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]);
NSURLResponse *urlResponse;
NSData *data = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:newAddressPartOfURL]] returningResponse:&urlResponse error:nil];
// Configure the cell.
UIImage *urlImage = [[UIImage alloc] initWithData:data];
// NSLog(#"%i",[imageView.image topCapHeight]);
cell.title.text = title;
cell.description.text = description;
cell.image.image = urlImage;
[urlImage release];
}
return cell;
}
Doing synchronous downloads as your cells are being drawn is definitely going to cause some unsmooth scrolling. You could try to replace those with asynchronous calls, and filling in the data with a generic object while the download is happening. When the download completes, then call reloadData on your tableview.
afaik the dequeueReusableCellWithIdentifier method is called as cells get flush etc. Build your data / do the requests on init, not in the cell creation!

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