maybe somebody can help me. I Have different class objects. They'll get created in the TableView.m file with arrays as properties of these objects. How can I populate the TableView out of these Objects so that every cell contains on object? When I am adding the objects to an array I am getting an error, when I am running the simulator.
Error:
App1[6354:7304461] -[Object1 isEqualToString:]: unrecognized selector sent to instance 0x600000455c00
I think that the TableView doensn't know how to create the cell. But I don't have enough experience to know what is really going on.
Thanks
- (void)viewDidLoad {
[super viewDidLoad];
//creating first Object of NSObject Class Object1
Object1 *object1Class = [[WLAN alloc]init];
object1Class.object1PicsCreated = [[NSMutableArray alloc] init];
object1Class.object1TextsCreated = [[NSMutableArray alloc] init];
[object1Class.object1PicsCreated addObject:object1Class.picsObject1];
[object1Class.object1TextsCreated addObject:object1Class.textsObject1];
//creating second Object of NSObject Class Object2
Object1 *object1Class = [[WLAN alloc]init];
object2Class.object2PicsCreated = [[NSMutableArray alloc] init];
object2Class.object2TextsCreated = [[NSMutableArray alloc] init];
[object1Class.object2PicsCreated addObject:object2Class.picsObject2];
[object1Class.object2TextsCreated addObject:object2Class.textsObject2];
if (!_objects){
_objects = [[NSMutableArray alloc] init];
}
[_objects addObject:object1Class]
[_objects addObject:object2Class]
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return _objects.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
cell.textLabel.text = [_objects objectAtIndex:indexPath.row];
return cell;
}
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [NSString stringWithFormat:#"%#",[_objects objectAtIndex:indexPath.row]];
Xcode crashes because you pass an instance of Object1 to the setter which expects NSString. UITableView thinks that object is NSString so calls NSString's methods against it (for you it was -isEqualToString:), which is a reason it crashes.
Whatever you want to show needs to be converted to NSString before you pass it there.
How can I populate the TableView out of these Objects so that every cell contains on object?
This is a very strange question. UITableView's rows are UITableViewCell-s. You may not populate a table with anything else.
Maybe, you should describe your tasks in more details.
Related
I have a NSMutableArray with some objects of type Notes i.e. my class with attributes, iD,note,noteTitle.. I am using the notes array to populate a tableview, and on click, I am trying to open another controller view, to show that specific table row clicked
My code are :
when controller load:
- (void)viewDidLoad {
[super viewDidLoad];
Notes * myNotes =[[Notes alloc] init];
notes = [myNotes getMyNotes];
[super viewDidLoad];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [tableData count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = #"SimpleTableItem";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
NSString *title = [NSString stringWithFormat:#"%#...",((Notes *) [notes objectAtIndex:indexPath.row]).noteTitle ];
// here i am using my notes nsmutablearray from above method to populate tableview list of titles.. and it is populated fine.
cell.textLabel.text = title;
cell.imageView.image=[UIImage imageNamed:#"back.jpg"];
return cell;
}
Now when I click a row, I am trying to just see if, I will be getting title, body and it for that certain note..
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:YES];
long selectedRow = indexPath.row;
NSString *title = [NSString stringWithFormat:#"%#...",((Notes *) [notes objectAtIndex:selectedRow]).notes];
NSLog(#"%#",title);
}
But I am getting null this time...
why same code in above function is populating my table view but here not even logging it.
Thank you in advance....
You can try in didSelectRowAtIndexPath method
Notes *note = [[Notes alloc]init];
note = [notes objectAtIndex: indexPath.row];
NSString *title = [NSString stringWithFormat:#"%#...",note.notes];
NSLog(#"%#",title);
Hope it works.
Hello I'm having trouble deleting a cell / record after it implemented the section in tableview.
See the code
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"celula";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
alimento *p = [sessaoAlimento objectAtIndex:indexPath.section];
crudAlimento *obj = [[crudAlimento alloc] init];
NSArray *arrayAlime = [obj listarAlimentoSessao:[p tipoAlimento] filtro:srBar.text];
alimento *objAlimento = [arrayAlime objectAtIndex:indexPath.row];
NSString *registro = [NSString stringWithFormat:#"%# - %#", [objAlimento alimentoid], [objAlimento nomeAlimento]];
[[cell textLabel]setText:registro];
return cell;
}
detail is that I can not use object id to pass to the method
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
crudAlimento *deleteAlimento = [[crudAlimento alloc] init];
alimento *objUsuario = [arrayAlimento objectAtIndex:indexPath.row];
[deleteAlimento deletar:objUsuario];
[self carregaListaSessao:#""];//com sessao
}
I'm struggling a little with the language gap, but it looks like you are trying to delete an object from an empty crudAlimento object. You are creating a new one:
crudAlimento *deleteAlimento = [[crudAlimento alloc] init]; // this is empty unless you're overriding the init method in crudAlimento
And then deleting an item from it:
[deleteAlimento deletar:objUsuario]; // deleting an object from an empty source
From the looks of things, it's hard to tell if your data source for your table is mutable, but assuming it is, I think you need to remove a sub-element of sessaoAlimento (something like sessaoAlimento[indexPath.section].tipoAlimento[indexPath.row])
Im parsing JSON data in an external class (NSObject) class that then put organizes the parsed data into an array. That array is then placed into my Table View. Because it takes longer to parse the info then to finish viewDidLoad the array is always set to nil.
Code:
- (void)viewDidLoad
{
//Fetching Data
[super viewDidLoad];
myClass = [[MyClass alloc] init];
[myClass fetchDataWithTarget:self];
//Initialize the dataArray
dataArray = [[NSMutableArray alloc] init];
//First section data
NSArray *firstItemsArray = myClass.fechedDataArray;
NSDictionary *firstItemsArrayDict = [NSDictionary dictionaryWithObject:firstItemsArray forKey:#"data"];
[dataArray addObject:firstItemsArrayDict];
}
- (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 *dictionary = [dataArray objectAtIndex:indexPath.section];
NSArray *array = [dictionary objectForKey:#"data"];
NSString *cellValue = [array objectAtIndex:indexPath.row];
cell.textLabel.text = cellValue;
return cell;
}
How can I insure that firstItemsArray is set after the data is fetched.
Note: There is obviously more to the table view then this, I did all the dictionary stuff to separate sections and what not.
You'll have to load the JSON data into the array BEFORE
- (void) viewDidLoad
or use some type threading (asynchronous method) such as:
performSelectorInBackground:withObject
NSOperation or Grand Central Dispatch
I have created an array, two dictionaries and a tableview. The tableview should display the contents of array and that array contains the data of dictionaries. When i try to display it using "[mArray addObject:(mDictionary)];" its throwing an exception but if i use "[mArray addObject:[mDictionary objectForKey:#"firstname"]];" its working fine.
Can you help me to understand why is it happening and isn't it possible to display the dictionary value without using "objectForKey"?
Here is my "ViewController.m".
#import "ViewController.h"
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
mArray = [[NSMutableArray alloc]init];
mDictionary = [[NSMutableDictionary alloc]init];
[mDictionary setValue:#"shanu" forKey:#"firstname"];
[mDictionary setValue:#"kumar" forKey:#"lastname"];
mDictionary2 = [[NSMutableDictionary alloc]init];
[mDictionary2 setValue:#"hgjghjgf" forKey:#"firstname1"];
[mDictionary2 setValue:#"ghjgjgfj" forKey:#"lastname1"];
[mArray addObject:mDictionary];
[mArray addObject:mDictionary2];
CGRect frame = self.view.frame;
UITableView *tableView = [[UITableView alloc]initWithFrame:frame style:UITableViewStylePlain];
tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
tableView.backgroundColor = [UIColor cyanColor];
tableView.separatorColor = [UIColor blackColor];
tableView.delegate = self;
tableView.dataSource = self;
[self.view addSubview:tableView];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return #"Array and Tableview";
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return mArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell"];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"];
}
cell.textLabel.text = [mArray objectAtIndex:indexPath.row];
return cell;
}
- (void)dealloc
{
[mArray release];
[mDictionary release];
[mDictionary2 release];
[super dealloc];
}
#end
Declare an array in .h file:
NSArray *keys
write this in viewDidLoad
keys = [mDictionary allKeys];
This in cellForRowAtIndexPath
cell.textLabel.text = [mDictionary objectForKey:[keys objectAtIndex:indexPath.row];
If you try to assign the some text to the cell's textlabel the object returned from:
[mArray objectAtIndex:indexPath.row];
should be a string and not a whole dictionary.
When you just put the whole dictionary in the array [mArray objectAtIndex:indexPath.row]; will return a dictionary and you cannot assign a dictionary to the textlabel so you get an exception. If you want to store the whole dictionary use objectForKey to get the string you want:
cell.textLabel.text = [[mArray objectAtIndex:indexPath.row] objectForKey:#"WHAT_EVER_KEY_YOU_WANT"];
btw, you are not using ARC zo you probably want to get an autoreleased UITableViewCell so add autorelease to you cell:
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"] autorelease];
or
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"];
[cell autorelease];
Array contains similar type objects. You can add dictionary objects into array. There is no problem in that case. The problem is when you get an element from array and assign to cell.textLabel.text. Here object is type of dictionary and cell.textLabel.text is type of nsstring. So you should assign a value for key of dictionary object into cell.textLabel.text.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell"];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"];
}
cell.textLabel.text = [[mArray objectAtIndex:indexPath.row] objectForKey:#"firstname"];
cell.detialTextLabel.text = [[mArray objectAtIndex:indexPath.row] objectForKey:#"lastname"];
return cell;
}
I think it will be helpful to you.
This solved my problem
NSDictionary *cellDict = [self.tableInfoArr objectAtIndex:indexPath.row];
//This is to don't care about what is key and value in that dictionary
NSArray *keyArr = [cellDict allKeys];
//As at each index of array only one dictionary exist.
NSString *keyStr = [keyArr objectAtIndex:0];
cell.titleLabel.text = keyStr;
cell.detailLabel.text = [cellDict valueForKey:keyStr];
I'd like to create a simple reference app that lists a group of people, their job title, and their portrait. What I have so far is the list of people and their job title. It works alright, but I think I should have done it differently.
From reading other posts, I suppose I should be using dictionaries. This is how my PList currently looks:
And this is how the important bits of my code look:
#implementation RootViewController
#synthesize staffArray, subtitleArray;
- (void)viewDidLoad
{
[super viewDidLoad];
NSString* path = [[NSBundle mainBundle] pathForResource:#"StaffData" ofType:#"plist"];
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];
NSMutableArray *tmpNameArray = [dict objectForKey:#"Root"];
self.staffArray = [[NSMutableArray alloc] initWithArray:tmpNameArray copyItems:YES];
NSMutableArray* tmpSubtitleArray = [dict objectForKey:#"Subs"];
self.subtitleArray = [[NSMutableArray alloc] initWithArray:tmpSubtitleArray copyItems:YES];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [staffArray 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:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
cell.textLabel.text = [staffArray objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [subtitleArray objectAtIndex:indexPath.row];
return cell;
}
Using two arrays kind of defeats the purpose of OOP, I think, because in this case the people aren't connected to their job titles; they just happen to be in the same order. I'd like to create for example:
Array called Jonas, first value = job title, second value = pathToImage.png.
Another array called Andreas, etc etc etc.
What do I do?
I think that as a start, your design lacks an "Employee" object, that has data members like "Name", "JobTitle", etc... After you have this set up, just create an array of people and take whatever you need from there, by index.