How to ensure fluency in a frequently refreshed TableView? - ios

Question

there has a tableView Who refreshed every 0.5 seconds;
i uesd tableView reloadData or reloadSections: withRowAnimation:
Both of them cause FPS decrease
what can i do for it?
the tableView has new data every 0.5 seconds
and need display new data immediately
code:
- (void)registerTableViewCells {
[self.tableView registerClass:[UITableViewCell1 class] forCellReuseIdentifier: UITableViewCell1Identifier];
[self.tableView registerClass:[UITableViewCell2 class] forCellReuseIdentifier: UITableViewCell2Identifier];
[self.tableView registerClass:[UITableViewCell3 class] forCellReuseIdentifier: UITableViewCell3Identifier];
}
- (void)makeUpDisplaySource {
NSMutableArray *arrM = [NSMutableArray array];
[arrM addObject:#[UITableViewCell1Identifier, #(60), #(1)]];
[arrM addObject:#[UITableViewCell2Identifier, #(55), #(10)]];
[arrM addObject:#[UITableViewCell3Identifier, #(30), #(10+_fortySeat*30)]];
// _fortySeat is boolValue
self.displaySource = arrM;
}
tableView delegate
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSArray *dataArr = self.displaySource[indexPath.section];
NSString *identifier = dataArr[0];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier forIndexPath:indexPath];
return cell;
}
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
if ([NSStringFromClass(cell.class) isEqualToString:#"UITableViewCell1"]) {
UITableViewCell1 *newcell = (UITableViewCell1 *)cell;
[newcell updatCellUI];
}
else if ([NSStringFromClass(cell.class) isEqualToString:#"UITableViewCell2"]) {
UITableViewCell2 *newcell = (UITableViewCell2 *)cell;
[newcell updatCellUIBuy: model1 sell: model2];
}
else if ([NSStringFromClass(cell.class) isEqualToString:#"UITableViewCell3"]){
cell.backgroundColor = GL_CELL_BACKGROUD_COLOR;
[cell addSubview:self.someView];// someView is a lazy property
}
}

Answer 1

If you are not using reusable cells, of course, reload the data every 0.5 seconds may cause FPS problems beacause you'll reload the data of all the cells present in your TableView.
Also even if you are reloading data with reloadSections:, you'll have problems if you are reloading all the modified cells. Even those who are not visible. -- And this may cause problems.
In that case I suggest you to :
Use : [self.tableView registerNib:[UINib nibWithNibName:#"TableViewCell" bundle:nil] forCellReuseIdentifier:#"CellID"];
This will register your tableView under a xib file and the cells under an ID.
In cellForRowAtIndexPath: load your cell using this ID :
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CellID"];
Using reusable cells you will increase the speed of loading your TableView and it may help you while refreshing it.
If you are already using reusable cells I suggest you to let people know it in your question.
Even if your are using reusable cells you could simply decrease a bit the interval time between 2 reloads if you still have problems with FPS.
I might not have completly understood your question and I might be wrong on certains points. Of course do not hesitate to let me know/edit my answer, I will apreciate it.