UITableView for iOS - ios

Question

I am very new to Objective-C. I just searched and tried to learn about UITableView.
I have created this UITableView. instead of "a" in all the rows i want it to be in a sequence like "a b c d..." and if i increase the no of rows it should scroll. its not scrolling so here is my code.
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
CGRect frame = self.view.frame;
UITableView *tableView = [[UITableView alloc] initWithFrame:frame style:UITableViewStylePlain];
tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
tableView.backgroundColor = [UIColor cyanColor];
tableView.delegate = self;
tableView.dataSource = self;
[self.view addSubview:tableView];
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 20;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cellIDent"];
cell.textLabel.text = #"a";
return cell;
}
#end

Answer 1

set table view Delegates in IB or if u created Programmatically then in viewDidLoad Take one array fill it Dynamically or Statically.Give array count in NumberOfRowsInsection method and reload table view at appropriate place

Answer 2

in your cellForRowAtIndexPath: add these lines
char ch = 'a' + indexPath.row;
cell.textLabel.text = [NSString stringWithFormat:#"%c" , ch];

Answer 3

Check this tutorial, I'm sure it will help you
UItableView Guide
and for scrolling, You don't need to do anything yourselves, as the number of cells increases beyond the provided size, it automatically becomes scrollable and make sure that scrolling is enabled in your UITableView attribute inspector, check the image
Happy Coding
Regards

Answer 4

Use below code.....define alphabetarr in globally then use it in code...
- (void)viewDidLoad
{
alphabetarr = [[NSArray alloc] initWithObjects:#"a",#"b",#"c",#"d",#"e",#"f",#"g",#"h",#"i",#"j",#"k",#"l",#"m",#"n",#"o",#"p",#"q",#"r",#"s",#"t",#"u",#"v",#"w",#"x",#"y",#"z", nil];
CGRect frame = self.view.frame;
UITableView *tableview = [[UITableView alloc] initWithFrame:frame];
tableview.backgroundColor = [UIColor cyanColor];
tableview.separatorColor = [UIColor blackColor];
tableview.delegate = self;
tableview.dataSource = self;
[self.view addSubview:tableview];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [alphabetarr count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 30.0 ;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell!=nil) {
cell = nil;
}
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
cell.textLabel.text = [alphabetarr objectAtIndex:indexPath.row];
return cell;
}