TableView Unable to get DATA which are scrolled up or down - objective-c

Question

Whenever I try to get data from a cell it returns empty value, however I found that I'm unable to read data from cells that are Scrolled Up/Down of TableView
here is image clearing my situation
Here is the code I'm using for saving data:
NSMutableArray *arrTmp = [[NSMutableArray alloc] init];
for(int i = 0; i<[tblView numberOfRowsInSection:0]; i++){
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
FUCellView *cell = [tblView cellForRowAtIndexPath:indexPath];
UITextField *tfNo = (UITextField *)[cell viewWithTag:i + 100];
UIButton *btnTime = (UIButton *)[cell viewWithTag:i + 200];
UITextField *tfVisit = (UITextField *)[cell viewWithTag:i + 300];
UIButton *btnProvider = (UIButton *)[cell viewWithTag:i + 400];
NSMutableDictionary *theDictionary = [[NSMutableDictionary alloc] init];
if([tfNo.text length] > 0 && tfNo.text != nil){
NSString* str = [tfNo.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
[theDictionary setObject:str forKey:#"number"];
}
else{
[theDictionary setObject:#"" forKey:#"number"];
}
if([btnTime.titleLabel.text length] > 0 && btnTime.titleLabel.text != nil){
NSString* str = [btnTime.titleLabel.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
[theDictionary setObject:str forKey:#"time"];
}
else{
[theDictionary setObject:#"" forKey:#"time"];
}
if([tfVisit.text length] > 0 && tfVisit.text != nil){
NSString* str = [tfVisit.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
[theDictionary setObject:str forKey:#"visit_type"];
}
else{
[theDictionary setObject:#"" forKey:#"visit_type"];
}
if([btnProvider.titleLabel.text length] > 0 && btnProvider.titleLabel.text != nil){
NSString* str = [btnProvider.titleLabel.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
[theDictionary setObject:str forKey:#"provider"];
}
else{
[theDictionary setObject:#"" forKey:#"provider"];
NSLog(#"ProviderELse");
}
[arrTmp addObject:theDictionary];

Answer 1

UITableview is reusing the cells. So you can't get the values in for loop. This will return nil.
A better approach is to use a data model for storing the values.
For example: Create a data Model . Add some properties to it. And load cells with these properties. Now only you need to update the model object properties.
Store these model objects in an array.
Finally you can have the data ready at any time.

Answer 2

As i understand you, you should keep ur data somewhere else(u might have a model with data right?) and then appropriate to model set (in cellForRowAtIndexPath) UITableView. There is no need to set or get data direct from UITableView. Please read official documentation here
Here is nice lesson about Table View. Good luck.