I am just starting on Objective-C and XCode today.
I've made a
NSMutableArray
containing a bunch of strings.
I am looping through my array like this:
for (NSString *test in array) {
}
Now, how do I manage to show each of these values on the screen, standing underneath each other? I am not sure which UI element would be proper, and how to actually use that element (I don't know what element it is yet, but I only have knowledge on TextField, Button and Label so far).
Use a UILabel and set numberOfLines to 0 to have infinite lines.
UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 300, 200)];
myLabel.numberOflines = 0;
[self.view addSubview:myLabel];
NSString *testText = #"";
for (NSString *test in array) {
testText = [testText stringByAppendingFormat:#"%#\n", text];
}
myLabel.text = testText;
You better make an UITableView
number of rows at index path will be your [array count];
And at each cell, display [array objectAtIndex:indexPath.row];
If you need the whole code, tell me
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return array.count;
}
- (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1
reuseIdentifier:CellIdentifier];
}
cell.text = [array objectAtIndex:indexPath.row];
return cell;
}
Related
I'm creating a UITableViewController to list names of people and a star next to their name to indicating favorite people like so
The stars light up when touched, indicting a favorite, the row number of that cell goes into an NSMutableArray which is called in this method.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
When I tap a cell and add the index to the array, everything works, until I scroll down, and more stars are filled. They are in random, I believe, a few popup every time I scroll up then down, and look like this, faded stars...
This is the full star
Somehow the stars that shouldn't be filled are faded.
I cannot pin point where the stars are getting switched to on. The log only shows setting the star to on when I scroll to the particular cell.
My problem is that stars are switched on when they should not be, my array is good, I've checked that multiple times, it has to be the UITableView.
This is my code,
I only have two images of that star, one filled and one empty, and the
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
CustomCell *cell = [tableView cellForRowAtIndexPath:indexPath];
// NSLog(#"%i",[[cell.contentView subviews] count]);
// NSMutableArray *array = [[NSMutableArray alloc] initWithArray:[cell.contentView subviews]];
[tableView reloadData];
UIImageView *star = cell.star;
NSLog(#"Star Tag: %i",star.tag);
if (star.tag == kStarEmpty) {
[[Global sharedGlobal].favTeachers addObject:[NSString stringWithFormat:#"%i",cell.identifierTag]];
NSLog(#"Added: %i",cell.identifierTag);
// NSLog(#"setting star image: 1");
[star setImage:[UIImage imageNamed:#"star.png"]];
[star setTag:kStarFilled];
} else if (star.tag == kStarFilled) {
[[Global sharedGlobal].favTeachers removeObject:[NSString stringWithFormat:#"%i",cell.identifierTag]];
NSLog(#"Removed: %i",cell.identifierTag);
// NSLog(#"setting star image: 2");
[star setImage:[UIImage imageNamed:#"star_empty.png"]];
[star setTag:kStarEmpty];
}
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *teacher = [[Global sharedGlobal].teachers objectAtIndex:indexPath.row];
static NSString *CellIdentifier = #"Cell";
CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell"];
if (cell == nil) {
cell = [[CustomCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
UIImageView *starView = [[UIImageView alloc] init];
starView.image = [UIImage imageNamed:#"star_empty.png"];
starView.frame = CGRectMake(720, 2, 29, 29); //748,22
[starView setTag:kStarEmpty];
cell.star = starView;
[cell addSubview:starView];
cell.identifierTag = indexPath.row;
NSLog(#"This cell's identifier tag: %i",cell.identifierTag);
cell.textLabel.text = [[Global sharedGlobal].teachers objectAtIndex:indexPath.row];
for (int i = 0; i < [[Global sharedGlobal].favTeachers count]; i++) {
int favTeacherTag = [[[Global sharedGlobal].favTeachers objectAtIndex:i] intValue];
NSLog(#"%i",i);
NSLog(#"Fav Teacher Tag: %i",favTeacherTag);
if (cell.identifierTag == favTeacherTag) {
NSLog(#"found fav teacher: %i",cell.identifierTag);
NSLog(#"------------------------------------------");
// NSMutableArray *array = [[NSMutableArray alloc] initWithArray:[cell.contentView subviews]];
NSLog(#"setting star image");
[starView setImage:[UIImage imageNamed:#"star.png"]];
NSLog(#"Previous star tag: %i",starView.tag);
[starView setTag:kStarFilled];
break;
}
NSLog(#"--------------------------------");
}
return cell;
}
EXTRA INFO:
I have a custom class for the cells, which adds the cell.identifierTag as an int.
I am using Storyboard
I use static cells in Storyboard
Thank you! If you need any more information please comment and ask.
You need to make sure to set the UIImage to nil in the else block here:
if (cell.identifierTag == favTeacherTag) {
//your existing code
} else {
[starView setImage:nil];
};
This is because the cells are reused, and you may be getting a cell that had previously had the star image added.
call [tableView reloadData] at end of (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath method
After two days of this I finally figured it out. :D
I added this code, because I was using the same UIImageView sometimes and kept adding image views every time this - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath was called.
UIImageView *starView = [[UIImageView alloc] init];
if (cell.star == nil) {
starView.image = [UIImage imageNamed:#"star_empty.png"];
starView.frame = CGRectMake(720, 2, 29, 29); //748,22
[starView setTag:kStarEmpty];
cell.star = starView;
[cell addSubview:starView];
} else if (cell.star != nil) {
starView = cell.star;
}
I'm new to programming in Objective C
Here is my Dilemma: I'm pulling in a JSON file from the web and I'm able to display one of the elements (currDate) to my tableView but now I want to display more. From the code below I would I get it to display both currDate and prevDate
The logic needs to be changed here:
for (NSDictionary *diction in arrayOfEntry) {
NSString *currDate = [diction objectForKey:#"Current Date"];
a = currDate;
NSString *prevDate = [diction objectForKey:#"Previous Date"];
b = prevDate;
[array addObject:a];
}
[[self myTableView]reloadData];
I'm not sure if I need to change anything here but I'm attaching it to show how I'm displaying the array to my viewTable:
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [array count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(!cell)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [array objectAtIndex:indexPath.row];
//cell.textLabel.text = [array objectsAtIndexes:indexPath.row];
return cell;
}
just add another line:
[array addObject:a];
[array addObject:b];
make arrayOfEntry global. in .h file
NSArray *arrayOfEntry;
In numberOfRowsInSection
[arrayOfEntry count]
In tableView: cellForRowAtIndexPath
NSString *currDate = [[arrayOfEntry objectAtIndex:indexPath.row] objectForKey:#"Current Date"]
NSString *prevDate = [[arrayOfEntry objectAtIndex:indexPath.row] objectForKey:#"Previous Date"]
cell.textLabel.text = [NSString stringWithFormat:#"%# %#", currDate, prevDate];
To add multiple elements to an Array in objective c you need to use:
NSMutableArray *newArr = [NSMutableArray new];
Then:
[newArr addObject:dict1];
If you want, you can then set your NSArray you were using to the NSMutuableArray after the addition of objects is complete.
I have a problem in populating a uitableview created programmatically as a subview of uicollectionview.
here's my code:
.h file
#import <UIKit/UIKit.h>
#interface TheViewController : UICollectionViewController<UITableViewDataSource>
#property (atomic,strong) IBOutlet UIBarButtonItem *plus;
-(IBAction) addTeamPressed:(id)sender;
#end
.m file
- (void)viewDidLoad
{
[super viewDidLoad];
NSError *jsonParsingError = nil;
teamsView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, self.view.window.bounds.size.width, self.view.window.bounds.size.height)];
NSData *t = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://..."] options:NSDataReadingMappedIfSafe error:&jsonParsingError];
NSArray *tmp = [NSJSONSerialization JSONObjectWithData:t options:0 error:&jsonParsingError];
UITableViewCell * teamCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Cell"];
teams = [[NSMutableArray alloc]init];
[teamsView addSubview:teamCell];
teamsView.delegate = self;
teamsView.dataSource = self;
for(int i =0;i<tmp.count;i++){
[teams addObject:[tmp objectAtIndex:i]];
}
plus.title = #"Done";
[self.view addSubview:teamsView];
}
#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
// If You have only one(1) section, return 1, otherwise you must handle sections
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [teams count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
TeamsNameCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell = [[SquadreNameCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.name.text = [NSString stringWithFormat:#"%#",[[teams objectAtIndex:indexPath.row] objectForKey:#"name"]];
NSLog(#"%d teams",[teams count]);
return cell;
}
my tableview is displaying correctly, of course thanks to other functions not mentioned here, but no rows in the subview.
the compiler prints out the number of teams, so it calls the delegate methods, but it doesn't populate the subview...
what 's wrong with this?
thanks in advance
Dario
First you should remove this from your viewDidLoad:
UITableViewCell * teamCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Cell"];
[teamsView addSubview:teamCell];
Then make sure that your teams array is retained, just put this line to the header file:
#property (nonatomic, strong) NSMutableArray* teams;
And then use self.teams instead of just teams
At the end of viewDidLoad method you should call [teamsView reloadData];
Also it would be good to change your table data source method:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
TeamsNameCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
// please make sure that you allocate required object here
cell = [[TeamsNameCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// please make sure that you do have `name` property in your `TeamsNameCell` class
cell.name.text = [NSString stringWithFormat:#"%#",[[teams objectAtIndex:indexPath.row] objectForKey:#"name"]];
NSLog(#"%d teams",[teams count]);
return cell;
}
Please make sure that your TeamsNameCell class has name property in the header:
#property(nonatomic, strong) UILabel* name;
And also do not forget to allocate this label in the constructor of TeamsNameCell:
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
self.name = [[UILabel alloc] initWithFrame:CGRectMake(0,0,100,50)];
[self addSubview:self.name];
}
return self;
}
Or Maybe it is better to use default cell's label:
instead of cell.name.text = #"text"; use cell.textLabel.text = #"text";
solution is,
static NSString *CellIdentifier = #"Cell";
TeamsNameCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
cell = [[SquadreNameCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.labelText.text = [NSString stringWithFormat:#"%#",[[teams objectAtIndex:indexPath.row] objectForKey:#"name"]];
NSLog(#"%d teams",[teams count]);
return cell;
I am loading an array into a UITableView and the components of the array are long. What I want to do is customize the cells so that thier lenght will adjust to fit the text but the width will stay the same. Right now what is happening is when the text gets too long it will just write off the cell and you will see this.
I would like to see the text hit the end of the cell and then start a new line.
My code right now looks like this.
#implementation CRHCommentSection
#synthesize observationTable;
NSArray *myArray;
- (void)viewDidLoad
{
myArray = [CRHViewControllerScript theArray];
NSLog(#"%#", myArray);
//NSArray* paths = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:0 inSection:1]];
//[observationTable insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationTop];
[observationTable reloadData];
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
NSLog(#" in method 1");
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSLog(#" in method 2");
// Return the number of rows in the section.
return [myArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#" in method 3");
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewStylePlain reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [myArray objectAtIndex:indexPath.row];
//cell.textLabel.text = #"Label";
return cell;
}
I also found some code that somebody else wrote for multiple lined cells but don't know how to make it automatic based on the length of my string from the array.
static NSString *CellIdentifier = #"MyCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue2
reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = #"Label';
cell.detailTextLabel.text = #"Multi-Line\nText";
cell.detailTextLabel.numberOfLines = 2;
cell.detailTextLabel.lineBreakMode = UILineBreakModeWordWrap;
They said that you will also need to return a suitable height for the multi-line cell and that a height of (44.0 + (numberOfLines - 1) * 19.0) should work fine.
Does anyone have any ideas of how to do this?
Thanks.
You will need to work with following methods
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
// this method is called for each cell and returns height
NSString * text = #"Your very long text";
CGSize textSize = [text sizeWithFont:[UIFont systemFontOfSize: 14.0] forWidth:[tableView frame].size.width - 40.0 lineBreakMode:NSLineBreakByWordWrapping];
// return either default height or height to fit the text
return textSize.height < 44.0 ? 44.0 : textSize.height;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * cellIdentifier = #"YourTableCell";
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1
reuseIdentifier:cellIdentifier];
[[cell textLabel] setNumberOfLines:0]; // unlimited number of lines
[[cell textLabel] setLineBreakMode:NSLineBreakByWordWrapping];
[[cell textLabel] setFont:[UIFont systemFontOfSize: 14.0]];
}
[[cell textLabel] setText:#"Your very long text"];
return cell;
}
You want to look at the NSString function -(CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size
You will have to include it in your heightForRowAtIndexPath function to determine the right heights.
Also, set the numberOfLines for your label to 0. This allows it to adjust to whatever number of lines is needed.
How about using UITextView in table view cell.
At first, you have to change the height of cell.
Next, you put the UITextView into the cell.
Off course you can do this not by IB but by code.
For me the accepted answer worked by adding the else condition.
In my case, if condition was not getting satisfied as the [tableView dequeueReusableCellWithIdentifier:#"comment"]; was always returning cell which was not nil.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSInteger item = indexPath.item;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"comment"];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1
reuseIdentifier:#"comment"];
[[cell textLabel] setNumberOfLines:0]; // unlimited number of lines
[[cell textLabel] setLineBreakMode:NSLineBreakByWordWrapping];
[[cell textLabel] setFont:[UIFont systemFontOfSize: 14.0]];
}
// added else condition
else {
[[cell textLabel] setNumberOfLines:0];
[[cell textLabel] setLineBreakMode:NSLineBreakByWordWrapping];
[[cell textLabel] setFont:[UIFont systemFontOfSize: 14.0]];
}
[[cell textLabel] setText:commentsText[item]];
return cell;
}
I have some problems with UITableView and sections/rows.
Iam parsing the section names, all row names and row count per section from a xml.
I have 3 NSMutableArrays:
nameArray (with all row names)
sectionArray (all section names)
secCountArray (row count per section)
For the cellForRowAtindexPath to work, do I have to return the rows for the displayed section?
The next step I would do is to build an 2d Array with sections and all rows for each section.
Does anyone knows any better solution?
Here comes the code:
// 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];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
// Set up the cell
int xmlEntryIndex = [indexPath indexAtPosition: [indexPath length] -1];
//???
cell.textLabel.text = [[theParser.nameArray objectAtIndex: 1]valueForKey:#"name"];
return cell;
}
Thanks!
You could have one _section array and one _row array for the whole tableview.
like your view controller.h file declare array
NSMutableArray *arrSection, *arrRow;
then your view controller.m file paste below code..
- (void)viewDidLoad
{
[super viewDidLoad];
arrSection = [[NSMutableArray alloc] initWithObjects:#"section1", #"section2", #"section3", #"section4", nil];
arrRow = [[NSMutableArray alloc] init];
[arrSection enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSMutableArray *tempSection = [[NSMutableArray alloc] init];
[arrSection enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
[tempSection addObject:[NSString stringWithFormat:#"row%d", idx]];
}];
[arrRow addObject:tempSection];
}];
NSLog(#"arrRow:%#", arrRow);
}
#pragma mark - Table view data source
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [arrSection count];
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [arrSection objectAtIndex:section];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [[arrRow objectAtIndex:section] count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:nil];
if(!cell)
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:nil];
cell.textLabel.text = [[arrRow objectAtIndex:[indexPath section]] objectAtIndex:[indexPath row]];
return cell;
}
This method does not involve defining and creating your own custom view. In iOS 6 and up, you can easily change the background color and the text color by defining the
- (void)tableView:(UITableView *)tableView
willDisplayHeaderView:(UIView *)view
forSection:(NSInteger)section
delegate method.
For example:
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section
{
// Background color
view.tintColor = [UIColor blackColor];
// Text Color
UITableViewHeaderFooterView *header = (UITableViewHeaderFooterView *)view;
[header.textLabel setTextColor:[UIColor whiteColor]];
// Another way to set the background color
// Note: does not preserve gradient effect of original header
// header.contentView.backgroundColor = [UIColor blackColor];
}
you can see display dynamic section and row
May be helpful for you..
You could have one array for the whole table view. The array contains arrays for every section. Then the cellForRowAtIndexPath could look 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];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
[[cell textLabel] setText: [[[myArray objectAtIndex: indexPath.section] objectAtIndex: indexPath.row]];
return cell;
}
I hope this help you in your problem.
Edit: With the modern Objective-C and ARC I would write this as
- (void)viewDidLoad {
....
[self.tableView registerClass:[MyCellClass class] forCellReuseIdentifier:kMyCellIdentifier];
}
...
- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath {
MyCellClass *cell = [tableView dequeueReusableCellWithIdentifier:kMyCellIdentifier forIndexPath:indexPath];
cell.textLabel.text = myArray[indexPath.section][indexPath.row];
return cell;
}