Custom cells - how can I separate out tweets into componentsseparatedbyString - xcode

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...

Related

TWRequest from a dictionary in a tableView Cell

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]];

Issue with UITableView - updating table values

I am a newbie. I have written some code for UITable but I am unable to update table values after adding the values to the array. I'm using a tableview subclass. The code is as follows. Check the last function. Now how can I update my table values?
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
//#warning Potentially incomplete method implementation.
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//#warning Incomplete method implementation.
// Return the number of rows in the section.
return [_phones count];
}
- (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] autorelease];
}
HLPFoundPhones *p = (HLPFoundPhones *)[_phones objectAtIndex:indexPath.row];
NSString *subtitle = [NSString stringWithFormat:#"Found (%1.2f,%1.2f) on %#" ,[p loc].x, [p loc].y , [p foundDate]];
cell.textLabel.text = [p name];
cell.detailTextLabel.text = subtitle;
return cell;
}
- (void)insertNewObject
{
HLPPhonesAdd *view = [[HLPPhonesAdd alloc]initWithNibName:#"HLPPhonesAdd" bundle:nil];
[self.navigationController pushViewController:view animated:YES];
[view release];
}
- (void)updateTable:(CGPoint)loc name:(NSString *)_name{
HLPFoundPhones *a = [[HLPFoundPhones alloc]initWithLoc:loc name:_name];
[_phones addObject:a];
[phones reloadData];
}
call
[yourTableView reloadData];
in your updateTable Function..
- (void)updateTable:(CGPoint)loc name:(NSString *)_name{
HLPFoundPhones *a = [[HLPFoundPhones alloc]initWithLoc:loc name:_name];
[_phones addObject:a];
//give your tableView object instead of yourTableView
[yourTableView reloadData];
}
check value of _phone count and use in function
- (void)updateTable:(CGPoint)loc name:(NSString *)_name
{
HLPFoundPhones *a = [[HLPFoundPhones alloc]initWithLoc:loc name:_name];
[_phones addObject:a];
[table_name reloaddata];
}
Confirm the array _phones is allocated.
Then there will be problems if the [tableview reloadData] is called inside a thread.
So confirm the reloadData is called from the main thread.
First of all, your cell identifier looks to be same for all cells, which may confuse iOS which cell needs to be dequeued. So, keep your cell identifiers unique, something like below :
NSString *cellIdentifier = [NSString stringWithFormat:#"Cell-%d", indexPath.row];
then, after table view is first displayed, update your datasource and call:
[tableView reloadData];

How to solve slow scrolling in UITableView - using the YouTube API

I'm working with the google YouTube API, and I'm using this code found here http://pastebin.com/vmV2c0HT
The Code that slows things down is this one here
cell.imageView.image = [UIImage imageWithData:data];
When I remove that code it scrolls smoothly. Any idea on how I can go about having it load the images from google but still scroll smoothly? I've read some of the answers on loading images in a different way, but I still can't figure out how I'll make that work with the code I'm using.
Any help will be appreciated.
Bellow is the full code.
#import "RootViewController.h"
#interface RootViewController (PrivateMethods)
- (GDataServiceGoogleYouTube *)youTubeService;
#end
#implementation RootViewController
#synthesize feed;
- (void)viewDidLoad {
NSLog(#"loading");
GDataServiceGoogleYouTube *service = [self youTubeService];
NSString *uploadsID = kGDataYouTubeUserFeedIDUploads;
NSURL *feedURL = [GDataServiceGoogleYouTube youTubeURLForUserID:#"BmcCarmen"
userFeedID:uploadsID];
[service fetchFeedWithURL:feedURL
delegate:self
didFinishSelector:#selector(request:finishedWithFeed:error:)];
[super viewDidLoad];
}
- (void)request:(GDataServiceTicket *)ticket
finishedWithFeed:(GDataFeedBase *)aFeed
error:(NSError *)error {
self.feed = (GDataFeedYouTubeVideo *)aFeed;
[self.tableView reloadData];
}
#pragma mark Table view methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [[feed entries] count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
GDataEntryBase *entry = [[feed entries] objectAtIndex:indexPath.row];
NSString *title = [[entry title] stringValue];
NSArray *thumbnails = [[(GDataEntryYouTubeVideo *)entry mediaGroup] mediaThumbnails];
cell.textLabel.text = title;
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[thumbnails objectAtIndex:0] URLString]]];
cell.imageView.image = [UIImage imageWithData:data];
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 100.0f;
}
- (void)dealloc {
[super dealloc];
}
- (GDataServiceGoogleYouTube *)youTubeService {
static GDataServiceGoogleYouTube* _service = nil;
if (!_service) {
_service = [[GDataServiceGoogleYouTube alloc] init];
[_service setShouldCacheDatedData:YES];
[_service setServiceShouldFollowNextLinks:YES];
}
// fetch unauthenticated
[_service setUserCredentialsWithUsername:nil
password:nil];
return _service;
}
#end
GCD is a wonderful thing. Here is what I do:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"youTubeCell";
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell.
GDataEntryBase *entry = [[feed entries] objectAtIndex:indexPath.row];
NSString *title = [[entry title] stringValue];
NSArray *thumbnails = [[(GDataEntryYouTubeVideo *)entry mediaGroup] mediaThumbnails];
cell.textLabel.text = title;
// Load the image with an GCD block executed in another thread
dispatch_queue_t downloadQueue = dispatch_queue_create("image downloader", NULL);
dispatch_async(downloadQueue, ^{
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[thumbnails objectAtIndex:0] URLString]]];
UIImage * image = [UIImage imageWithData:data];
dispatch_async(dispatch_get_main_queue(), ^{
cell.imageView.image = image;
cell.imageView.contentMode = UIViewContentModeScaleAspectFit;
[cell setNeedsLayout];
});
});
dispatch_release(downloadQueue);
return cell;
}
Scrolling is now super smooth. The only drawback is that when you scroll quickly, cells are re-used and sometimes the images change as new ones come in.

Grouped Table View

New to Xcode,
I have created a grouped table view,containing different amounts of rows in each section and I now do not know the best way to populate the cells with data then move on to the next view when the cell is pressed.
Please Help.
Thank you
you could try out this basic tutorial to see how you can populate your table..
http://blog.webscale.co.in/?p=150
and for performing action when a cell is pressed, you would basically need to do something like this in the didSelectRowAtIndexPath method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if( 0 == indexPath.row)
{
NSLog(#"first row selected");
if(patientView == nil)
patientView = [[PatientList alloc]init];
[self.navigationController pushViewController:patientView animated:YES];
}
This is just a very very basic example of what you want to do... playing a bit around with this would help you learn more...
**set in .h file**
#property(nonatomic, retain)NSArray *data;
#property(nonatomic, retain)NSArray *sections;
**in .m file view did load**
self.sections = [[NSArray alloc] initWithObjects:#"university",#"sabaragamuwa",#"Srilanka",nil];
self.data = [[NSArray alloc]initWithObjects:
[[NSArray alloc] initWithObjects:
#"CiS",
#"006",
#"07", nil],
[[NSArray alloc] initWithObjects:
#"cis",
#"006",
#"007", nil],
[[NSArray alloc] initWithObjects:
#"cis",
#"006",
#"07", nil],nil];
**addthoose**
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
#warning Potentially incomplete method implementation.
// Return the number of sections.
return [self.sections count];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
return [self.sections objectAtIndex:section];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
#warning Incomplete method implementation.
// Return the number of rows in the section.
return [data count];}
**addalsooo**
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *SimpleTableIdentifier = #"SimpleTableIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:
SimpleTableIdentifier];
// Configure the cell...
if (cell == nil){
// Create the cell.
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:SimpleTableIdentifier];
}
NSArray* dataArray = [data objectAtIndex:indexPath.section];
cell.textLabel.text = [dataArray objectAtIndex:indexPath.row];
cell.textLabel.textAlignment = UITextAlignmentRight;
cell.textLabel.textColor = [UIColor colorWithRed:0.0 green:139.0/255.0 blue:69.0/255.0 alpha:1.0];
UIImage *cellImage = [UIImage imageNamed:#"oranimCellIco.png"];
cell.imageView.image = cellImage;
return cell;}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSArray* dataArray = [data objectAtIndex:indexPath.section];
NSString *catgory= [dataArray objectAtIndex:indexPath.row];
if(catgory==#"cis")
{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Answer Set"
message:#"Answer set as Yes Or No"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alertView show];
}
else if(catgory==#"006")
{
answerviewcon *vc1=[self.storyboard instantiateViewControllerWithIdentifier:#"answerviewcon"];
[self presentViewController:vc1 animated:YES completion:nil];
}

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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