I tried my best to solve this problem but I keep getting the following error:
-[__NSCFConstantString ling]: unrecognized selector sent to instance 0x12f80b0
what I am trying to do is to add line to core data and to table view with a text from the alertview, so a fire up an alertview and the user put the name of a new language, then the text in the alertview will be saved to core data and added to table view when the user click save.
In the table view, this is the relevant code:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if(cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
Languages *languagesDict = (Languages *)[languagesArray objectAtIndex:indexPath.row];
cell.textLabel.text = [languagesDict ling];
return cell;
}
And in the alertview this is the code when "save" button is clicked:
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 1)
{
NSString *tempText = [alertView textFieldAtIndex:0].text;
if(!languagesArray)
{
languagesArray = [[NSMutableArray alloc]init];
}
[languagesArray insertObject:tempText atIndex:0];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView insertRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
Languages *languagesDict = [NSEntityDescription insertNewObjectForEntityForName:#"Languages" inManagedObjectContext:_managedObjectContext];
[languagesDict setLing:tempText];
NSError *error = nil;
if (![_managedObjectContext save:&error])
{
}
}
}
Can someone tell me what is the wrong thing I am doing??
You're inserting NSString objects into your languagesArray.
When you try and extract the objects back out, in the line:
Languages *languagesDict = (Languages *)[languagesArray objectAtIndex:indexPath.row];
You're casting those NSString objects (for some reason) to be Languages objects. Then you try to call the ling method on the object you've fetched.
But the ling method doesn't exist in NSString, so that's how you're getting your run-time crash and your error message.
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.
Can anyone tell me why my code isn't showing any results in my table view. Here is my code. I already tried to change the #"#" into indexPath.row without any luck. I 'm looking for any answer into the right direction. I'm fairly new to xcode and objective-c. I would really appreciate any help.
-(void)waitAndFillPlaylistPool {
// arrPlaylist -> mutablearray which stores the value of loaded playlist in order to use it later
[SPAsyncLoading waitUntilLoaded:[SPSession sharedSession] timeout:kSPAsyncLoadingDefaultTimeout then:^(NSArray *loadedession, NSArray *notLoadedSession)
{
// The session is logged in and loaded — now wait for the userPlaylists to load.
NSLog(#"[%# %#]: %#", NSStringFromClass([self class]), NSStringFromSelector(_cmd), #"Session loaded.");
[SPAsyncLoading waitUntilLoaded:[SPSession sharedSession].userPlaylists timeout:kSPAsyncLoadingDefaultTimeout then:^(NSArray *loadedContainers, NSArray *notLoadedContainers)
{
// User playlists are loaded — wait for playlists to load their metadata.
NSLog(#"[%# %#]: %#", NSStringFromClass([self class]), NSStringFromSelector(_cmd), #"Container loaded.");
NSMutableArray *playlists = [NSMutableArray array];
[playlists addObject:[SPSession sharedSession].starredPlaylist];
[playlists addObject:[SPSession sharedSession].inboxPlaylist];
[playlists addObjectsFromArray:[SPSession sharedSession].userPlaylists.flattenedPlaylists];
[SPAsyncLoading waitUntilLoaded:playlists timeout:kSPAsyncLoadingDefaultTimeout then:^(NSArray *loadedPlaylists, NSArray *notLoadedPlaylists)
{
// All of our playlists have loaded their metadata — wait for all tracks to load their metadata.
NSLog(#"[%# %#]: %# of %# playlists loaded.", NSStringFromClass([self class]), NSStringFromSelector(_cmd),
[NSNumber numberWithInteger:loadedPlaylists.count], [NSNumber numberWithInteger:loadedPlaylists.count + notLoadedPlaylists.count]);
NSLog(#"loadedPlaylists >> %#",loadedPlaylists);
arrPlaylist = [[NSMutableArray alloc] initWithArray:loadedPlaylists];
NSLog(#"arrPlaylist >> %#",arrPlaylist);
}];
}];
}];
}
- (NSInteger) tableView:(UITableView *) tableView numberOfRowsInSection:(NSInteger)section {
return [arrPlaylist 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];
}
cell.textLabel.text = [arrPlaylist objectAtIndex:indexPath.row];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
It's hard to tell what you're doing in the method, waitAndFillPlaylistPool, but if this is taking any time to get this data, then you need to call reloadData on your table view ([self.tableView reloadData]) as the last line in that method (or when any async method returns -- I can't tell where that might be in your code).
I'm creating a chat application. I have 2 methods in my view controller one for sending and one for receiving the messages. In the sending method i create a NSMutableDictionary with two objects ..
NSMutableDictionary *msgFilter = [[NSMutableDictionary alloc] init];
[msgFilter setObject:messageStr forKey:#"msg"];
[msgFilter setObject:#"you" forKey:#"sender"];
[messages addObject:msgFilter];
"messages" is my main NSMutableArray for holding all the messages, whose property is set and synthesized and allocated. When i send the message it is properly added into the NSMutableArray and the UITableView is updated showing me the values in the cell.
I have a method in my appDelegate to check for messages received and use the same procedure to parse the data and store it in an NSMutableDictionary. This dictionary is then passed to the viewcontroller and added into the same NSMutableArray(messages) and i then call [self.chattable reloadData]. But this doesn't do anything. When i nsloged the NSMutableArray it only had the received message not the whole data(send + received).
Why is it not adding the received messages into the same array and why is it not refreshing my table. I've been trying to get it to work for days now...Plz help..
//Recives message section
NSMutableDictionary *msgFilter = [myDelegate msgFilter];
[messages addObject:msgFilter];
[self.tView reloadData];
//Tableview section
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [messages count];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
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];
}
NSDictionary *s = (NSDictionary *) [messages objectAtIndex:indexPath.row];
NSString *sender = [s objectForKey:#"sender"];
NSString *message = [s objectForKey:#"msg"];
if ([sender isEqualToString:#"you"])
{
cell.detailTextLabel.text = [NSString stringWithFormat:#"TX: %at", message];
}
else
{
cell.detailTextLabel.text = [NSString stringWithFormat:#"RX: %at", message];
}
return cell;
}
Declare messages array in Application Delegate. so it will be shared array. so might be your problem get solved. because it is shared array. so you can add Dictionary in messages array from any where, no need to pass dictionary between diff UIView.
I am developing a application in that I want to print the array value in the cell contain label place. I got the vlaues for array like names=[results valueForKey:#"name"].
I write the code for print that value in a lable in cellForRowAtIndexPath like
-(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];
}
NSInteger row=indexPath.row;
cell = [self getCellContentView:CellIdentifier];
UILabel *lblTemp1 = (UILabel *)[cell viewWithTag:1];
lblTemp1.text = [names objectAtIndex:row];
//lblTemp2.text = [names objectAtIndex:row];
return cell;
}
but ,when the application got the error at lblTemp1.text = [names objectAtIndex:row] like Program received signal: “EXC_BAD_ACCESS”.So please tell me how to solve this problem.
It seems you've missed to retain the array names. Try,
names = [[results valueForKey:#"name"] retain];
You could consider using declared properties to overcome the overhead of retaining and releasing the objects.
seems to be new bee. please check out for step by step tutorial
http://adeem.me/blog/2009/05/19/iphone-programming-tutorial-part-1-uitableview-using-nsarray/
dont know whats wrong with my table view, I have a dictionary(this dictionary is created by a sqlite operation) and I am trying to create cells like this
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MyIdentifier = #"MyIdentifier";
MyIdentifier = #"tblCellView";
CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if(cell == nil) {
[[NSBundle mainBundle] loadNibNamed:#"CustomCell" owner:self options:nil];
cell = aCustomCell;
aCustomCell=nil;
}
NSMutableDictionary *tempDictionary=[[NSMutableDictionary alloc] init];
tempDictionary=[offendersNamesList objectForKey:[NSString stringWithFormat:#"key%d", indexPath.row+1]];
[[cell offendersImageView] setImage:[UIImage imageNamed:#"contact.png"]];
[cell.offendersNameLbl setText:[tempDictionary objectForKey:#"name"]];
[cell.offendersViolation setText:[tempDictionary objectForKey:#"offence"]];
[tempDictionary release];
//[cell setLabelText:[arryData objectAtIndex:indexPath.row]];
return cell;
}
all the items are displayed correctly but when I scroll the table view up the application crashes can you help me in this?
You are first allocating a new NSMutableDictionary and store it in tempDictionary. However, in the very next line, you overwrite that variable with a pointer to a new object (tempDictionary=[offendersNamesList objectForKey:[NSString stringWithFormat:#"key%d", indexPath.row+1]];). So you've got a memory leak here, the [[NSMutableDictionary alloc] init] is unnecessary, remove it.
Now, due to the naming conventions, the object that you've got from the offendersNamesList is autoreleased, yet you later call [tempDictionary release]; and thus over-release it. Remove that as well.