How to load NSArray in steps on UITableView - objective-c

Question

-(void)addMyButton
{
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:#selector(aMethod) forControlEvents:UIControlEventTouchUpInside];
button.tag = 1;
[button setTitle:#"Show More" forState:UIControlStateNormal];
button.frame = CGRectMake(110.0, 430.0, 100.0, 40.0);
[self.view addSubview:button];
}
-(void)viewDidLoad
{
[self addMyButton]; // Call add button method on view load
n=1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if(n==1){
n++;
return 10;
}
else if(n==2){
n++;
return 20;
}
else
return 30;
}
-(void) aMethod
{
if(n>=3)
{
[button setTitle:#"Return" forState:UIControlStateNormal];
[button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
//[button setBackgroundColor:[UIColor brownColor]];
}
else{
// [button setTitle:#"Show More" forState:UIControlStateNormal];
// [button setBackgroundColor:[UIColor clearColor]];
}
NSLog(#"n==>> %d",n);
[tbl reloadData];
}
An array having thirty elements when i click ok return button then it should be shows twenty elements on TableView after next clicked i should shows ten elements and so on..

Answer 1

Please try the edited code
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if(n==1)
{
n++;
return 20; //edited from return 10 to return 20-- to return 20 elements for the first time
}
else if (n==2)
{
return 30; //Return 30 when click on view more
}
}
-(void) aMethod
{
if(n==2)
{
[button setTitle:#"Return" forState:UIControlStateNormal];
[button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
//[button setBackgroundColor:[UIColor brownColor]];
}
else
{
n=1;
[button setTitle:#"Show More" forState:UIControlStateNormal];
[button setBackgroundColor:[UIColor clearColor]];
}
NSLog(#"n==>> %d",n);
[tbl reloadData];
}
try my code and let me know if i miss anything according to your requirement

Answer 2

try like this....
#import "YourTableViewControllerClass.h"
#interface YourTableViewControllerClass ()
{
NSMutableArray * tableArray;
}
#end
#implementation TableViewController
- (void)viewDidLoad
{
[super viewDidLoad];
tableArray = [[NSMutableArray alloc]initWithArray:#[#"1",#"2",#"3",#"4",#"5",#"6",#"7",#"8",#"9",#"10"]];
}
-(IBAction)addMoreCells // button action to add more cells
{
[tableArray addObjectsFromArray:#[#"11",#"12",#"13",#"14",#"15",#"16",#"17",#"18",#"19",#"20"]];
[self.tableView reloadData];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return tableArray.count ;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell" forIndexPath:indexPath];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"cell"];
}
cell.textLabel.text = [tableArray objectAtIndex:indexPath.row];
return cell;
}
#end

Answer 3

It looks like you're almost there.
You need tableView:cellForRowAtIndexPath: from the UITableViewDataSource protocol. This method effectively links the correct index in your array to a UITableViewCell.
e.g. something like:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"myCell"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"myCell"];
}
cell.textLabel.text = [self.myArray objectAtIndex:indexPath.row];
return cell;
}

Answer 4

Try this,
-(void)addMyButton
{
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:#selector(aMethod)forControlEvents:UIControlEventTouchUpInside];
button.tag = 1;
[button setTitle:#"Show More" forState:UIControlStateNormal];
button.frame = CGRectMake(110.0, 430.0, 100.0, 40.0);
[self.view addSubview:button];
}
-(void)viewDidLoad
{
[super viewDidLoad];
[self addMyButton]; // Call add button method on view load
n=2;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if( [your_array count] <= (n*10)){
n=1;
return [your_array count];
}
else
{
return n*10;
}
return 0;
}
-(void)aMethod
{
n++;
if([your_array count]<=n*10){
[button setTitle:#"Return" forState:UIControlStateNormal];
[button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
}
else{
[button setTitle:#"Show More" forState:UIControlStateNormal];
[button setBackgroundColor:[UIColor clearColor]];
}
[tbl reloadData];
}
Also add the code to set the data in table view cell (from your array) inside this method,
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
You can check the functionality by using the dummy code given below,
- (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];
}
cell.textLabel.text = [NSString stringWithFormat:#"%ld",indexPath.row+1];
return cell;
}