I am trying to build my first iOS app that parses json from a web service.
In my .h file i create an array
NSArray *items;
In my .m file i call the website and store the data into the array. This all goes fine except eventually I am trying to display the data in a uitableview.
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"ItemsCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSLog(#"%#",items);
NSDictionary *item = [items objectAtIndex:indexPath.row];
NSString *title = [item objectForKey:#"title"];
cell.title.text = title;
return cell;
}
The nslog of items produces:
{
category = code;
keyword = "";
limit = 20;
lowPrice = "";
page = 0;
products = (
{
description = "...";
mobileFriendly = 1;
popularity = 2021;
productId = code;
title = "title";
}, and so on...
)
I am getting an error trying to do NSDictionary *item = [items objectAtIndex:indexPath.row]; It says doing objectAtIndex:indexPath.row is invalid.
What am I doing wrong?
Thanks for your help!
The value stored in items is an instance of NSDictionary, but you're sending it an NSArray message. Also, the code you posted is referring to gift and ignoring the item anyway.
The array you're looking for is actually stored under the key products inside the items dictionary, so you need to do something like this:
NSArray *products = [items objectForKey:#"products"];
NSDictionary *product = [products objectAtIndex:indexPath.row];
// Then use the product, instead of using 'gift' (whatever that is).
NSString *title = [product objectForKey:#"title"];
items is not a NSArray - it is a NSDictionary. so it has no objectAtIndexPath: method.
Related
A lot of the methods have deprecated in iOS 7 in order to set font, textLabel, and color for UITableView cells. I'm also just having a difficult time populating the view with these values. Here's a snippet of my code:
- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
NSArray* jobs = [json objectForKey:#"results"];
for(NSDictionary *jobsInfo in jobs) {
JobInfo *jobby = [[JobInfo alloc] init];
jobby.city = jobsInfo[#"city"];
jobby.company = jobsInfo[#"company"];
jobby.url = jobsInfo[#"url"];
jobby.title = jobsInfo[#"jobtitle"];
jobby.snippet = jobsInfo[#"snippet"];
jobby.state = jobsInfo[#"state"];
jobby.time = jobsInfo[#"date"];
jobsArray = [jobsInfo objectForKey:#"results"];
}
}
I am looping through an array of dictionaries from a GET request and parsed. I am now attempting to fill my UITableView with the following code:
-
(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [jobsArray count];
}
- (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];
}
NSDictionary *jobsDic = [jobsArray objectAtIndex:indexPath.row];
[cell.textLabel setText:[jobsDic objectForKey:#"jobtitle"]];
return cell;
}
Also, I have declared this is in my .h file:
NSArray *jobsDic;
Any ideas on what I'm doing wrong? Is this an iOS 7 problem?
It seems that you reinitialize jobsarray at the end of the forin loop.
You didn't mean ?
NSArray* jobs = [json objectForKey:#"results"];
NSMutableArray *jobsTemp = [[NSMutableArray alloc] initWithCapacity:jobs.count];
for(NSDictionary *jobsInfo in jobs) {
JobInfo *jobby = [[JobInfo alloc] init];
jobby.city = jobsInfo[#"city"];
jobby.company = jobsInfo[#"company"];
jobby.url = jobsInfo[#"url"];
jobby.title = jobsInfo[#"jobtitle"];
jobby.snippet = jobsInfo[#"snippet"];
jobby.state = jobsInfo[#"state"];
jobby.time = jobsInfo[#"date"];
[jobsTemp addObject:jobby];
}
self.jobsArray = jobsTemp; //set #property (nonatomic, copy) NSArray *jobsArray; in the .h
[self.tableView reloadData]; //optional only if the data is loaded after the view
In the cell for row method :
- (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];
}
JobInfo *job = self.jobsArray[indexPath.row];
cell.textLabel.text = job.title;
return cell;
}
And don't forget :
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.jobsArray.count;
}
Update - an user suggested an edit :
It's true that count isn't a NSArray property. But as Objective-C lets us use a shortcut notation for calling method with a dot, this code works. You have to know limitation of this : if you use a NSArray subclass with a count property with a custom getter this could have side effects #property (nonatomic, strong, getter=myCustomCount) NSUInteger count. As I think code readability is to me one of most important things I prefer to use dot notation. I think Apple SHOULD implement count as readonly property so I use it this way (but it's my point of view). So for those which don't agree with me just read return [self.jobsArray count]; in the tableView:numberOfRowsInSection: method.
Change the declaration of jobsArray from NSArray to NSMutableArray.
Add an initialization at the beginning point of fetchedData method like follows.
if(!jobsArray) {
jobsArray = [NSMutableArray array];
}
else {
[jobsArray removeAllObjects];
}
Remove the following line.
jobsArray = [jobsInfo objectForKey:#"results"];
Instead of that, add the initialized object to the array at the end of for loop.
[jobsArray addObject:jobby];
Add a [tableView reloadData]; at the end of your *-(void)fetchedData:(NSData )responseData; method implementation.
Initially when you are loading the view, tableView will get populated. After you received the data, tableView will not be known that it is received.
Everything else seems good. Hope rest will work fine.
Trying to fill my UItableview with my Array. I would like to match a object in my array to the correct cell.
My array is as follows.
(
(
{
cost = 160;
height = 1;
room_number = 1;
square_size = 1;
title = "TIMBER BLINDS";
width = 1;
}
),
(
{
cost = 170;
height = 1;
room_number = 2;
square_size = 1;
title = "ROMAN BLINDS";
width = 1;
}
)
My question is how do i match the correct title to the cell based on the room_number in my array?
Thanks
It seems like you are having array of array which contains dictionary so firstly fetch the object from an array by indexPath.row. The fetched object is also an array. Fetch dictionary object from it by objectAtIndex. Now that you have accessed dictionary so you can access your key value.
NSMutableArray *fetchedArray= [yourArray objectAtIndex:indexPath.row];
NSDictionary *fetchedDictionary = [fetchedArray objectAtIndex:0];
NSNumber *roomNumber= [fetchedDictionary valueForKey:#"room_number"];
if([roomNumber intValue] == indexPath.row) {
[cell setTextLabel:[fetchedDictionary valueForKey:#"title"]];
}
Assuming your array is self.tableContent
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *object = self.tableContent[index.section][index.row];
..... some cell code
cell.title = object[#"title"];
}
It is dictionary of array of array
you can get value of "room_number" by
NSString *room_number = [[[myarray1 objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:#"room_number"]
() -- this represents array
{} -- this represents dictionary
So you can see you have an array of arrays and each array contains a single object and i.e a dictionary.
In terms of Objective C, it is like this:
NSDictionary *dict1 = //first dictionary
NSDictionary *dict2 = //second dictionary
NSArray *mainArray = [NSArray arrayWithObjects: [NSArray arrayWithObject:dict1],[NSArray arrayWithObject:dict2], nil];
To retrieve value inside key title from dictionary and display that in TableView:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
// other code to set up cell
NSDictionary *array =[[mainArray objectAtIndex:indexPath.row] objectAtIndex:0];
cell.textLabel.text = [array objectForKey:#"title"];
return cell;
}
I have been through many links and fortunately I got many similar links but nothing worked Out.
my array is appearing like this in Output, using NSLog()..
products = (
{
cid = 1;
name = "hello world";
},
{
cid = 2;
name = "It is an array";
},
{
cid = 3;
name = "error error";
},
{
cid = 4;
name = "OMG! still same";
},
{
cid = 5;
name = "any help";
...
...
},
{
cid = 130;
name = "How is the work going on.";
},
{
cid = 131;
name = "Had a nice lunch";
}
);
success = 1
Code to parse JSON, where "news" is an Array var..
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible=NO;
news = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSLog(#"Feeds...%#",news);
[myTableView reloadData];
}
Code to display table row, here in "news" value is being displayed by NSLog(); Error comes for NSDictionary.
-(UITableViewCell *)tableView: (UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
NSLog(#"=====%#====",news);
NSDictionary *myDict = [news objectAtIndex:indexPath.row];
NSArray *myArray = [myDict objectForKey:#"name"];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"MainCell"];
if (cell==nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"MainCell"];
}
for (NSString *str in myArray) {
cell.textLabel.text = str;
}
return cell;
}
I am not able to find what i'm missing here.., Please help me out.
Thank you in advance.
Your JSON structure is something like this:
Dictionary-->Array-->Object (Dictionary).
So you need to do:
Extract the Array from the dictionary using the key product
Extract an object(Dictionary) from the array using the index
Get the name from the dictionary object using the key name
Instead of this:
NSDictionary *myDict = [news objectAtIndex:indexPath.row];
NSArray *myArray = [myDict objectForKey:#"name"];
Use:
NSArray *myArr = [news objectForKey:#"products"];
cell.textLabel.text = [[myArr objectAtIndex:0] objectForKey:#"name"];
Edit
Also change your numberOfRowsInSection like:
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [[news objectForKey:#"products"] count];
}
news is a NSDictionary, and a dictionary does not have a method objectAtIndex:
You have to use instead [news objectForKey:...];
[news objectAtIndex:indexPath.row];
NSMutabledictionary is indexpath.row so add first news in array and that array name add in
your code and you get nothing an
Put NSDictionary in Array then use it in Table method
NSMutableArray *result=[[NSMutableArray alloc] init];
result = [googleResponse valueForKey: #"products"];
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSMutableDictionary *dt = [result objectAtIndex:indexPath.row];
}
It will Help you !!!!!
I'm working on information retrieval where in the latest information in on top of UITableView. The code goes like this.
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
LoanModel* loan = _feed.products[indexPath.row];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" ];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:#"Cell"];
}
NSString *myString = [NSString stringWithFormat:#"%#",[loan name]];
NSArray *myWords = [myString componentsSeparatedByString:#","];
NSMutableArray *reversed = [NSMutableArray arrayWithCapacity:[myWords count]];
NSEnumerator *enumerator = [myWords reverseObjectEnumerator];
for (id element in enumerator) {
[reversed addObject:element];
}
NSMutableString *reverseString = [reversed componentsJoinedByString:#","];
cell.textLabel.text = reverseString;
return cell;
}
I'm getting the JSON object which contain two fields cid and name respectively. I'm showing only the name is tableview. But I want to show it in reverse i,e last update should show at first. But above code showing the content in reverse. IF "hello" is the content, then it shows "olleh". Please suggest me how to get the UITableView in reverse list. I'm a newbie to iOS.
If you want to have the reversed order of cells / objects they represent, you have to change
LoanModel* loan = _feed.products[indexPath.row];
to
LoanModel* loan = _feed.products[_feed.products.count - 1 - indexPath.row];
assuming that _feed.products is an NSArray.
The array you are using to display the the data in tableView, you'll need to reverse that and then display the data in tableView
NSArray* reversed = [[myArray reverseObjectEnumerator] allObjects];
you can use this to make your array objects order in reverse.
Try This:
NSArray* reversedArray = [[myWords reverseObjectEnumerator] allObjects];
I have a preferences view which shows a different table view depending on which Segmented Control is clicked.
I hard coded some NSMutableArrays to test basic principles:
prefsIssuesList = [[NSMutableArray alloc] init];
[prefsIssuesList addObject:#"Governance"];
[prefsIssuesList addObject:#"Innovation and technology"];
...etc
prefsIndustriesList = [[NSMutableArray alloc] init];
[prefsIndustriesList addObject:#"Aerospace and defence"];
... etc
prefsServicesList = [[NSMutableArray alloc] init];
[prefsServicesList addObject:#"Audit and assurance"];
...etc
currentArray = [[NSMutableArray alloc] init];
currentArray = self.prefsIssuesList;
Then reload the tableview with currentArray, adding a UITableViewCellAccessoryCheckmark.
Everything works fine.
But now I want to store wether the checkmark is on or off in a pList file, and read this back in.
Ideally want to a plist like this
Root Dictionary
Issues Dictionary
Governance Number 1
Innovation and technology Number 0
etc
I've got as far as working this out
// Designate plist file
NSString *path = [[NSBundle mainBundle] pathForResource: #"issues" ofType:#"plist"];
// Load the file into a Dictionary
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:path];
self.allNames= dict;
[dict release];
NSLog(#"Dict is %#", allNames); // All the data in the pList file
NSMutableArray *issueSection = [allNames objectForKey:#"Issues"];
NSLog(#"Issues is %#", issueSection); // The data is the Issues Section
NSString *issueVal = [issueSection objectForKey:#"Governance"];
NSLog(#"Governance is %#", issueVal); //The value of the Governance key
But what I really want to do is loop through the Issues Dictionary and get the key/value pairs so
key = cell.textLabel.text
value = UITableViewCellAccessoryCheckmark / UITableViewCellAccessoryNone
depending wether it's 1 or 0
I'm assuming that I can still assign one of the three NSMutableArrays to currentArray as I did in the hardcoded version, and use currentArray to reload the tableview.
Then amend this code to build the tableview
NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];
NSString *key = [keys objectAtIndex:section];
NSArray *nameSection = [names objectForKey:key];
static NSString *CellIdentifier = #"Cell";
//UITableViewCell *cell = [self.prefsTableView dequeueReusableCellWithIdentifier:SectionsTableIdentifier];
UITableViewCell *cell = [self.prefsTableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil) {
cell=[[[UITableViewCell alloc]
initWithFrame:CGRectZero
reuseIdentifier: CellIdentifier] autorelease];
}
cell.textLabel.text = [nameSection objectAtIndex:row];
return cell;
But my brain has melted, I've spent about six hours today reading up on pLists, NSArrays, NSMutableDisctionaries, standardUserDefaults to little avail.
I've managed to UITableViews inside UINavigationViews, use SegmentedControls, download asynchronous XML, but now I'm finally stuck, or fried, or both. Over what should be fairly simple key/value pairs.
Anyone care to give me some idiot pointers?
Typing it out led to another post with that one little word I needed to get me back on track :)
Use key/value pairs in a pList to stipulate the name of the cell and wether it was selected or not by the user.
plist is based on a structure like this
Root Dictionary
Services Dictionary
Peaches String 1
Pumpkin String 0
Here's how I grabbed three Dictionary arrays from a pList and used the key/value pairs to reload a tableview depending on which segmentControl was touched:
- (void)viewDidLoad {
[super viewDidLoad];
// Designate plist file
NSString *path = [[NSBundle mainBundle] pathForResource: #"issues" ofType:#"plist"];
// Load the file into a Dictionary
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:path];
self.allNames= dict;
[dict release];
// Create the Named Dictionaries from Dictionary in pLIst
NSMutableDictionary *allIssues = [self.allNames objectForKey:#"Issues"];
self.prefsIssuesList = allIssues;
[allIssues release];
NSMutableDictionary *allIndustries = [self.allNames objectForKey:#"Industries"];
self.prefsIndustriesList = allIndustries;
[allIndustries release];
NSMutableDictionary *allServices = [self.allNames objectForKey:#"Services"];
self.prefsServicesList = allServices;
[allServices release];
// Assign the current Dictionary to out placeholder Dictionary
currentDict = [[NSMutableDictionary alloc] init];
currentDict = self.prefsIssuesList;
}
Then styling the table cells
- (UITableViewCell *)tableView:(UITableView *)prefsTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSUInteger row = [indexPath row];
NSArray *keysArray = [self.currentDict allKeys];
NSString *theKey = [keysArray objectAtIndex:row];
NSString *theValue = [self.currentDict objectForKey: [keysArray objectAtIndex:row]];
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [self.prefsTableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil) {
cell=[[[UITableViewCell alloc]
initWithFrame:CGRectZero
reuseIdentifier: CellIdentifier] autorelease];
}
cell.textLabel.text = theKey;
if (theValue == #"0") {
cell.accessoryType = UITableViewCellAccessoryNone;
}else {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
return cell;
}
The if clause at the end doesn't seem to be working, I'll post that as a new question (unless anyone comments quickly!)
Finally the segmentControls assign the different dictionaries to the placeholder array and reload the tableview
This took me a very long day to figure out (as a noobie) so I hope it helps someone
-(IBAction) segmentedControlIndexChanged{
switch (self.segmentedControl.selectedSegmentIndex) {
case 0:
//currentArray = self.prefsIssuesList;
currentDict = self.prefsIssuesList;
break;
case 1:
//currentArray = self.prefsIndustriesList;
currentDict = self.prefsIndustriesList;
break;
case 2:
//currentArray = self.prefsServicesList;
currentDict = self.prefsServicesList;
break;
default:
//currentArray = self.prefsIssuesList;
currentDict = self.prefsIssuesList;
break;
}
[prefsTableView reloadData];
}
Shout if there's a neater or better way of d