iOS Objective C : How to increase number of rows after given condition - ios

Question

I am very new to iOS, Living in a very small village with no help on iOS, I need help in my code where I can increase number of rows once I reach to row number 20.
I actually have more than 6000 lines, when try to show all of them in tableview, it takes lot of time, so I want to load all rows in efficient way, like increasing it like +20, +50 etc
here is my code:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return a;
}
and I am trying to increase rows like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if(indexPath.row == 20)
{
[_myTable reloadData];
[self.myTable beginUpdates];
a= a +50;
[self.myTable endUpdates];
}
if (indexPath.row > 60)
{
[self.myTable beginUpdates];
a= a +100;
[self.myTable endUpdates];
}
}
I declared myTable as property
I am sorry if my post is looking foolish I am at very basic position and sorry for my bad English.

Answer 1

The numbers of rows to be displayed in a tableView depends on data available i.e., the data to be displayed in the UITableView.
Let an array "Countries" containing list of 3 countries:
NSArray *countries;
countries = #[#"India",#"USA",#"Germany",nil];
so, now the UITableView has 3 rows, so use this:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return countries.count;
}
so if the countries list increased later, then it will work.
No need to increase number of rows in table manually.
If the response is from server, then use this:
NSArray *dataArray = [responseObject objectForKey:#"countriesJson"];
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return dataArray.count;
}
Sample Project:
Please check my GitHub link below:
https://github.com/k-sathireddy/TableRowCountDynamic
Note: More images are loaded if we reach a certain limit.

Answer 2

You have to follow below algorithm or logic,
1)First just initialize your array with the 20 objects and that array will use for the display in a UITableView as a datasource.
2)Then you need to implement the UIScrollView delegate method, - (void)scrollViewDidScroll:(UIScrollView *)aScrollView in which you can write a some code like this:
- (Void) scrollViewDidScroll: (UIScrollView *) aScrollView
{
self.tbleSerachResult.frame=self.tbleSerachResult.frame;
if (aScrollView==self.tblOutlet) {
[currentTextfield resignFirstResponder];
CGPoint offset = aScrollView.contentOffset;
CGRect bounds = aScrollView.bounds;
CGSize size = aScrollView.contentSize;
UIEdgeInsets inset = aScrollView.contentInset;
float y = offset.y + bounds.size.height - inset.bottom;
float h = size.height;
float reload_distance = 10;
if(y > h + reload_distance)
{
//add more 20 records to your existing array which used for the UITableView data source and reload the UITableView.
//Put your load more data method here...
}
}
}
3) after this, you doesn't require any other thing to maintain this. Just implement the UITableView delegate and datasource methods as normally. It will work.
Try this way, if still facing any issue let me know I will give you example code.
Hope it works for you!! Happy coding :)